EasyVR User Manual
EasyVR 2.0
User Manual
Release 3.6.7
www.veear.eu
www.veear.eu
Table of Contents
EasyVR Module ................................................................................................................................................ 5
Product Description ........................................................................................................................................ 5
EasyVR 2.0 Features ................................................................................................................................. 5
Technical specifications ................................................................................................................................. 6
Physical dimensions and pin assignment .................................................................................................. 6
Recommended Operating Conditions ....................................................................................................... 7
Electrical Characteristics ........................................................................................................................... 7
Power Supply Requirements ..................................................................................................................... 7
Serial Interface ........................................................................................................................................... 7
Microphone ................................................................................................................................................ 8
Audio Output .............................................................................................................................................. 9
General Purpose I/O ................................................................................................................................ 10
Flash Update ........................................................................................................................................... 11
Quick start for using the module .................................................................................................................. 13
EasyVR Development Board ................................................................................................................... 13
EasyVR on Arduino ................................................................................................................................. 14
EasyVR on Arduino Pro Mini ................................................................................................................... 17
EasyVR on Basic Stamp.......................................................................................................................... 17
EasyVR on Arduino Mega ....................................................................................................................... 18
EasyVR on Arduino Leonardo ................................................................................................................. 18
EasyVR Shield for Arduino ........................................................................................................................... 19
Technical specifications ............................................................................................................................... 19
Physical dimensions and pin assignment ................................................................................................ 19
Recommended Operating Conditions ..................................................................................................... 20
Jumper settings ....................................................................................................................................... 20
LEDs ........................................................................................................................................................ 20
Quick start guide for using the Shield .......................................................................................................... 21
With Arduino Leonardo ............................................................................................................................ 21
With Arduino 2009 – Uno – Mega ........................................................................................................... 21
EasyVR Programming ................................................................................................................................... 23
Communication Protocol .............................................................................................................................. 23
Introduction .............................................................................................................................................. 23
Arguments Mapping ................................................................................................................................. 24
Command Details .................................................................................................................................... 25
Status Details ........................................................................................................................................... 30
Communication Examples ........................................................................................................................... 33
Recommended wake up procedure ......................................................................................................... 33
Recommended setup procedure ............................................................................................................. 33
Recognition of a built-in or custom SI command ..................................................................................... 34
Adding a new SD command .................................................................................................................... 34
Training an SD command ........................................................................................................................ 35
Recognition of an SD command .............................................................................................................. 35
Read how many commands in a group ................................................................................................... 36
Read a user defined command group ..................................................................................................... 36
Use general purpose I/O pins .................................................................................................................. 37
Use custom sound playback .................................................................................................................... 37
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Read sound table ..................................................................................................................................... 37
Built-in Command Sets ................................................................................................................................ 38
Error codes ................................................................................................................................................... 39
Protocol header file ...................................................................................................................................... 40
EasyVR Arduino Library Documentation .................................................................................................... 41
EasyVR Class Reference............................................................................................................................. 41
Public Types ............................................................................................................................................ 41
Public Member Functions ........................................................................................................................ 41
Detailed Description ................................................................................................................................. 42
Member Enumeration Documentation ..................................................................................................... 42
Constructor & Destructor Documentation ................................................................................................ 45
Member Function Documentation ........................................................................................................... 45
EasyVRBridge Class Reference .................................................................................................................. 53
Public Member Functions ........................................................................................................................ 53
Detailed Description ................................................................................................................................. 53
Member Function Documentation ........................................................................................................... 54
EasyVR Commander ..................................................................................................................................... 55
Getting Started ............................................................................................................................................. 55
Speech Recognition ..................................................................................................................................... 56
Recognition Settings .................................................................................................................................... 58
Phone Tones Generation (DTMF) ............................................................................................................... 59
TM
Testing SonicNet ...................................................................................................................................... 59
Using Custom Data ...................................................................................................................................... 61
Sound Table ............................................................................................................................................ 61
Speaker Independent Custom Vocabularies ........................................................................................... 62
Updating Custom Data ............................................................................................................................ 63
Updating Firmware ....................................................................................................................................... 65
Troubleshooting ........................................................................................................................................... 65
Downloading custom data or update fails ................................................................................................ 65
How to get support ........................................................................................................................................ 66
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Document History Information
Revision
Date
Description
3.6.7
26.03.2015



Updated protocol documentation
Fixed and updated EasyVR Commander screenshots
Added recognition settings description
3.6.6
01.04.2014



Updated documentation for the new Arduino Library
Added software support for Arduino Leonardo
Added warning for using the Shield on non-5V systems
3.6.5
25.11.2013

Added Arduino Mega and Arduino Leonardo
3.6.4
20.11.2013

Minor corrections and footnotes updated
3.6.3
18.11.2013





Changed connection diagram Arduino Uno / BasicStamp.
Added more diagrams.
Added Arduino Pro mini.
Added note to function embedToken.
Removed Robonova.
3.6.2
6.11.2013


Fixed cross-references
Updated pictures of new module version
3.6.1
5.11.2013

Updated Arduino Library documentation
3.6
23.07.2013

Updated documentation for firmware version 2 additions
(custom grammars, SonicNet and DTMF)
3.4.2
14.11.2012


Troubleshooting Section added
Troubleshooting Soundtable download.
3.4.1
9.10.2012


Document History Information added
EasyVR DK added
3.4
8.10.2012


Added CMD_COUNT_SD
Added protocol examples
3.3
Before October 2012

Original Document
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EasyVR Module
Product Description
EasyVR 2.0 is a multi-purpose speech recognition module
designed to easily add versatile, robust and cost effective
speech recognition capabilities to almost any application.
The EasyVR 2.0 module can be used with any host with
an UART interface powered at 3.3V – 5V, such as PIC
and Arduino boards. Some application examples include
home automation, such as voice controlled light switches,
locks, curtains or kitchen appliances, or adding “hearing”
to the most popular robots on the market.
EasyVR 2.0 Features











1,2
Supports up to 28 custom Speaker Independent (SI) command vocabularies (new to EasyVR 2.0)
Supported Languages:
o US English
o UK English
o German
o French
o Italian
o LA Spanish
o Korean
o Japanese
Supports up to 32 user-defined Speaker Dependent (SD) triggers or commands as well as Voice
Passwords. SD custom commands can be spoken in ANY language.
A variety of built-in Speaker Independent (SI) commands for ready to run basic controls, in the
followings languages:
o English (US)
o Italian
o German
o French
o Spanish
o Japanese
SonicNet technology for wireless communications between modules or any other sound source
2
(Audio CD, DVD, MP3 Player) (new to EasyVR 2.0)
2
DTMF tone generation (new to EasyVR 2.0)
Easy-to-use and simple Graphical User Interface to program Voice Commands and audio.
Module can be used with any host with an UART interface (powered at 3.3V - 5V)
Simple and robust documented serial protocol to access and program through the host board
3 x GPIO lines (IO1, IO2, IO3) that can be controlled by new protocol commands.
PWM audio output that directly supports 8Ω speakers.
Sound playback of up to 9 minutes of recorded sounds or speech.
1
A QuickT2SI™ Lite license (sold separately) is required to enable creation of Speaker Independent
vocabularies (maximum 12 commands per set).
2
Custom Speaker Independent vocabularies, SonicNet™ and DTMF generation are available since firmware
version 2 (a free update from version 1 is available for download).
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Technical specifications
Physical dimensions and pin assignment
Connector
J1
J2
J3
J4
Number
Name
Type
Description
1
GND
-
Ground
2
VCC
I
Voltage DC input
3
ERX
I
Serial Data Receive (TTL level)
4
ETX
O
Serial Data Transmit (TTL level)
1-2
PWM
O
Differential audio output (can directly drive 8Ω speaker)
1
MIC_RET
-
Microphone reference ground
2
MIC_IN
I
Microphone input signal
1
/RST
I
Active low asynchronous reset (internal 100K pull-up)
2
/XM
I
Boot select (internal 1K pull-down)
3
IO1
I/O
General purpose I/O (3.0 VDC TTL level)
4
IO2
I/O
General purpose I/O (3.0 VDC TTL level)
5
IO3
I/O
General purpose I/O (3.0 VDC TTL level)
Note: the GPIO (J4.3, J4.4, and J4.5) are at nominal 3.0VDC level. Do not connect 5VDC
directly to these pins!
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Recommended Operating Conditions
Symbol
Min
Typ
Max
Unit
3.3
5.0
5.5
V
Ambient Operating Temperature Range
0
25
70
°C
ERX
Serial Port Receive Data
0
-
VCC
V
ETX
Serial Port Transmit Data
0
-
VCC
V
Min
Typ
Max
Unit
VCC
Parameter
Voltage DC Input
Ta
Electrical Characteristics
These are applicable to J4 pins only, including IO1-3, /XM and /RST.
Symbol
Parameter
VIH
Input High Voltage
2.4
3.0
3.3
V
VIL
Input Low Voltage
-0.1
0.0
0.75
V
IIL
Input Leakage Current (0 < VIO < 3V, Hi-Z Input)
<1
10
µA
Strong
10
kΩ
Weak
200
kΩ
RPU
Pull-up Resistance
VOH
Output High Voltage (IOH = -5 mA)
VOL
Output Low Voltage (IOL = 8 mA)
2.4
V
0.6
V
Max
Unit
Power Supply Requirements
Symbol
Parameter
Min
Typ
ISleep
Sleep current
<1
mA
IOper
Operating current
12
mA
Audio playback current (with 8Ω speaker)
180
mA (RMS)
ISpeaker
Serial Interface
The EasyVR is a “slave” module communicating via an asynchronous serial interface (commonly known as
UART interface), with the following features:


Baud Rate: 9600 (default), 19200, 38700, 57600, 115200
Frame: 8 Data bits, No parity, 1 Stop bit
The receiver input data line is ERX, while the transmitter output data line is ETX. No handshake lines are
used.
Example of a serial data frame representing character “A” (decimal 65 or hexadecimal 41):
VCC
Idle
Start
1
0
0
0
0
0
1
0
Stop
Idle
0V
See also chapter Communication Protocol later on this manual for communication details.
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Microphone
The microphone provided with the EasyVR module is an omnidirectional electret condenser microphone
(Horn EM9745P-382):




Sensitivity -38dB (0dB=1V/Pa @1KHz)
Load Impedance 2.2K
Operating Voltage 3V
Almost flat frequency response in the range 100Hz – 20kHz
If you use a microphone with different specifications the recognition accuracy may be adversely affected. No
other kind of microphone is supported by the EasyVR module.
Note: Vocal commands should be given from about 60cm from the microphone, but you can try
at greater distances by talking louder.
Positioning guidelines
Please note that improper acoustic positioning of the microphone will reduce recognition accuracy. Many
mechanical arrangements are possible for the microphone element, and some will work better than others.
When mounting the microphone in the final device, keep in mind the following guidelines:
1. Flush Mounting - The microphone element should be positioned as close to the mounting surface
as possible and should be fully seated in the plastic housing. There must be no airspace between
the microphone element and the housing. Having such airspace can lead to acoustic resonance,
which can reduce recognition accuracy.
GOOD
BAD
cavity
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2. No Obstructions, Large Hole - The area in front of the microphone element must be kept clear of
obstructions to avoid interference with recognition. The diameter of the hole in the housing in front of
the microphone should be at least 5 mm. Any necessary plastic surface in front of the microphone
should be as thin as possible, being no more than 0.7 mm, if possible.
clear area
internal
diaphragm
3. Insulation - The microphone should be acoustically isolated from the housing if possible. This can
be accomplished by surrounding the microphone element with a spongy material such as rubber or
foam. The provided microphone has this kind of insulating foam. The purpose is to prevent auditory
noises produced by handling or jarring the device from being “picked up” by the microphone. Such
extraneous noises can reduce recognition accuracy.
GOOD
BAD
absorbent
material
fastened
directly
4. Distance - If the microphone is moved from 15 cm to 30 cm from the speaker’s mouth, the signal
power decreases by a factor of four. The difference between a loud and a soft voice can also be
more than a factor of four. Although the internal preamplifier of the EasyVR compensates for a wide
dynamic range of input signal strength, if its range is exceeded, the user application can provide
feedback to the speaker about the voice volume (see appendix Error codes).
Audio Output
The EasyVR audio output interface is capable of directly driving an 8Ω speaker. It can also be connected to
an external audio amplifier to drive lower impedance loudspeakers.
Note: Connecting speakers with lower impedance directly to the module may permanently
damage the EasyVR audio output or the whole module.
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It is possible to connect higher impedance loads such as headphones, provided that you scale down the
output power according to the speaker ratings, for example using a series resistor. The exact resistor value
depends on the headphone power ratings and the desired output volume (usually in the order of 10kΩ).
Note: Connecting headphone speakers directly to the EasyVR audio output may damage your
hearing.
General Purpose I/O
Since the EasyVR communication interface takes two pins of the host controller, a few spare I/O pins are
provided, which can be controlled with the communication protocol, to get those pins back for basic tasks,
such as lighting an LED.
The three I/O pins IO1–IO3 are connected directly to the embedded microcontroller on the EasyVR module,
so they are referenced to the internal 3.0V regulated power supply. If you need to interface to circuits using a
different supply, there are a number of solutions you can adopt. Some of these are outlined below (here IOn
indicates any one of the three I/O pins of the EasyVR).
Use a pin as an output
All the I/O pins are inputs with weak internal pull-up after power on. You must explicitly configure a pin before
you can use it as an output (see the example code Use general purpose I/O pins).
5V
12V
IOn
I/O pin directly driving a
low-current LED
10
AC MAINS
Voltage
RELAY
LED
Inverted
OUT
Switched
Load
IOn
IOn
I/O pin connected to high
impedance 5V circuit (such as
MCU input pin)
I/O pin switching a load on a high voltage
line using a 12V relay
EasyVR 2.0
Z
-
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The exact components values in these circuits may vary. You need to calculate required values for your
application and choice of components. For example, resistor value for the LED circuit can be calculated
approximately as:
Where VLED is the LED forward voltage, as reported on the LED datasheet, at the driving current IOH (see
section Electrical Characteristics). Let’s assume a typical low-current LED has a VF=1.8V at 5mA, the
resistor value is:
Now stay on the safe side and choose a slightly larger resistor, such as 150Ω.
If you want to drive higher current LEDs, you need a circuit like the second one, where you put the LED
between the output resistor and the collector of the NPN transistor.
Use a pin as an input
All the I/O pins are inputs with weak internal pull-up after power on or reset. You may also configure the pin
to have a strong pull-up or no pull-up at all (see the example code Use general purpose I/O pins).
IOn
IOn
optional
filter
Isolated
IN
IOn
5V
IN
SWITCH
optocoupler
I/O pin connected to a switch
(or switching sensor)
I/O pin connected 5V source
(such as MCU output pin)
I/O pin with isolated input (for safety
circuits)
All these circuits assume the EasyVR pin has been configured with an internal pull-up (passive components
value can be adjusted to account for weak or strong pull-up).
Disabling the internal pull-up could be used to put the pin in high-impedance state, for example to simulate a
tri-state or open-drain output port.
Again, you should refer to the manufacturer’s datasheet when interfacing any external components and to
calculate required resistors values or other passive components.
Flash Update
The EasyVR module includes a boot loader that allows to update the firmware and to download new sound
tables to the on-board memory.
The boot mode is activated by keeping the /XM signal to a high logical level at power on or reset. This can be
easily done with a jumper (or switch) taking the signal to a suitable pull-up resistor.
To download a firmware update, a sound table or a custom grammar to the EasyVR, power on the module
with the jumper closed. For normal operation, just leave the jumper open. Do not change the jumper position
while the module is already powered on. It is safe to change /XM level while the module is reset (/RST low).
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VCC
/XM
Internal 1KΩ
Pull-down
Jumper
Boot mode selection circuit
The pull-up resistor value to use depends on the VCC power supply voltage. For the voltage of the /XM pin
when the jumper is closed (short) the following relation holds (note you have a voltage divider circuit):
Now if you want /XM to be at 3V (logic high) and solving for R, you get:
That makes 100Ω for 3.3V and around 680Ω for 5V power supplies. Other kinds of circuit are possible, that
is just an example and one of the simplest to realize.
To learn how to download new sound tables or custom grammars to your EasyVR 2.0 module, have a look at
the section Using Custom Data.
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Quick start for using the module
EasyVR Development Board
The EasyVR DevBoard can be used to program commands and
sounds into an EasyVR module and quickly test it. Just put your
EasyVR module on top of the DevBoard then connect the
microphone and an 8 ohm speaker and you are ready to go.
The DevBoard features a Freescale JS8 microcontroller
programmed as a USB-Serial adapter to convert data sent
between a PC and the EasyVR.
You can also write a test program on your PC, using the serial
port as you would on a microcontroller. Also it is possible to
upload new firmware and custom sound-tables. Everything is
managed automatically by the DevBoard so there is no need to
set any jumper: the board enters automatically in boot loader
mode when needed.
How to get started
1. Install drivers via double click “EasyVR_DevKit_Setup.exe”
2. If your Install succeeded you will see a new Virtual COM Port in your Device manager as soon as
you connect the USB cable to the EasyVR DevKit:
(The exact COM port number may vary)
3. Now start the EasyVR Commander Software
4. Choose advised COM Port and click connect
5. Then enjoy your EasyVR!
Hardware Interfaces
Connector J1 is a screw terminals block for differential audio output (can directly drive an 8Ω speaker).
Connector J6 is the audio input interface for connecting the microphone provided with the EasyVR module.
Connector J5 on the DevKit board replicate the GPIOs available on the EasyVR as follows:
Connector
Pin
Name
Type
Description
1
GND
-
J5
2
IO1
I/O
General purpose I/O (3.0 VDC TTL level)
(DevKit)
3
IO2
I/O
General purpose I/O (3.0 VDC TTL level)
4
IO3
I/O
General purpose I/O (3.0 VDC TTL level)
Ground
There is also an indication LED connected to IO1 to display status, which is handled for example by the
EasyVR Commander to show the module is listening.
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EasyVR on Arduino
You can connect the EasyVR module to an Arduino board basically in two ways:
1. Bridge mode – You can control the module using a software serial library and connect to the
module with the EasyVR Commander from your PC, with the same pin configuration
2. Adapter mode – You can use the Arduino board as a USB/Serial adapter by holding the
microcontroller in reset, but you need to change the connections once you want to control the
module from the microcontroller
Bridge mode
This is the preferred connection mode, since it allows simple communication with both the Arduino
microcontroller and the PC. All the provided examples for Arduino manage the bridge mode automatically
when the EasyVR Commander requests a connection.
Automatic bridge mode used to be supported only on Arduino boards with a bootloader implementing
EEPROM programming.The latest version of EasyVR Commander (since 3.1.x) and Arduino libraries (since
1.1) does not rely on that feature anymore, so it should work on all Arduino boards.
Note: bridge mode cannot be used to download a Sound Table or to perform a flash update.
You need to use adapter mode or a true USB/Serial adapter.
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Adapter mode
This connection scheme has the advantage of working with any Arduino board that has an on-board
USB/Serial adapter and not needing a spare input pin to enter bridge mode.
Also, it does not rely on the AVR microcontroller to do any software bridge between communication pins, so
it can be used to check your hardware in case of connection problems.
Using this method also allows you to download a Sound Table to the EasyVR module, provided you also
configure the module to start in boot mode (see paragraph Flash Update).
This configuration, with Reset shorted to GND, is for connection with the EasyVR Commander. To use the
module from the Arduino microcontroller, you need to remove the short (yellow wire) and move the ETX/ERX
connection to other pins. The example code uses pin 12 for ETX and pin 13 for ERX, like the above bridge
mode.
Arduino software
Follow these few steps to start playing with your EasyVR module and Arduino:
1.
2.
3.
4.
5.
Connect the EasyVR module to your Arduino board as outlined before
If you want audio output, connect an 8Ω speaker to J2 header
Connect the supplied microphone to the MIC (J3) connector
3
Install the EasyVR Arduino libraries on your PC (details at http://arduino.cc/en/Guide/Libraries)
Connect your Arduino board to your PC via USB.
To check everything is working fine:
1. Make sure you activate bridge mode (either manually or automatically) or you use adapter mode
2. Open the EasyVR Commander and connect to the Arduino serial port (see Getting Started)
3
The Arduino library archive file is installed in the EasyVR Commander program folder.
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To download a new sound-table:
1. Power OFF the EasyVR module (for example removing the USB cable)
2. Connect the /XM pin of J4 on the EasyVR module for boot mode (see Flash Update for a possible
circuit)
3. Power ON again the EasyVR module and the Arduino board (reconnect the USB cable)
4. Make sure you activate bridge mode (either manually or automatically) or you use adapter mode
5. Open the EasyVR Commander and select the Arduino serial port
6. While disconnected choose “Update Custom Data” from the “Tools” menu (see Using Custom Data)
To test the EasyVR module with your Arduino programming IDE:
1.
2.
3.
4.
Make sure you did not activate bridge mode manually
Open the example sketch TestEasyVR from your IDE menu “File” > “Examples” > “EasyVR”
Upload the sketch and open the “Serial Monitor” window
See comments on top of the sketch for usage details
When the EasyVR Commander is connected, you can also generate a template code for Arduino that will
use the provided libraries (see EasyVR Arduino Library Documentation). All you need is to write actions for
each recognized command and adapt the code to your needs.
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EasyVR on Arduino Pro Mini
The EasyVR can run on 3.3V and 5V input like the Arduino Pro Mini from Sparkfun.
EasyVR on Basic Stamp
The EasyVR module can be connected to all Basic Stamp 2 series devices following the connection scheme
below. This is supported by the EasyVR Commander software with a special “bridge” code running on the
Basic Stamp, which can be downloaded automatically if not present.
The status LED is used to signal that a recognition task is in progress and the application is listening for a
voice command. This is optional and can be omitted.
When connected with the EasyVR Commander you can add and remove custom voice commands, as well
as train and test them. You can also generate a template PBASIC code to manage voice recognition, which
you can easily customize for your own application.
Please note: the download of a sound table through any Basic Stamp 2 controller board is not
supported, due to limitations of this hardware setup. You may use an USB/Serial adapter, such
as the EasyVR DevBoard or another suitable configuration to update the flash memory of the
EasyVR module.
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EasyVR on Arduino Mega
EasyVR is compatible with the Arduino Mega. Just line up A5 on the Shield with A5 on the Arduino and do
the same with D0. Just as shown below in the picture. Then plugin the Shield as you are used to on any
other Arduino board.
EasyVR on Arduino Leonardo
Please note:
The use of the EasyVR Commander with Arduino Leonardo is only possible for command
creation/training and for testing the EasyVR functions, by using the “bridge” software included
with the latest Arduino library (version 1.4 and later).
To update the Flash memory and to load custom grammars/sounds on the EasyVR you may
use a normal Arduino board.
The EasyVR Shield can communicate with a Leonardo board the following way:
1. Using Serial1 on pins 0-1 and Jumper in the HW position.
The EasyVR Module can communicate with Arduino Leonardo the following way:
1. Using Serial1 on pins 0-1
2. Using any possible Soft serial setup. Please refer to the following notes for more info:
http://arduino.cc/de/Reference/SoftwareSerial
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EasyVR Shield for Arduino
The EasyVR Shield is an Arduino shield integrating the EasyVR module, designed to simplify the EasyVR
management for Arduino developers.
Technical specifications
68.7 mm
Physical dimensions and pin assignment
53.4 mm
Connector
Number
Name
Type
Shield interface, same as on Arduino
(Pins 0-1 are in use when J12 is set as UP, PC or HW)
(Pins 12-13 are in use when J12 is set as SW)
J1, J2
J3, J4
J9
J10
J11
J13
Description
LINE OUT
O
3.5mm stereo/mono headphone jack (16Ω - 32Ω headphones)
1-2
SPEAKER
O
Differential audio output (can directly drive an 8Ω speaker)
1
MIC_IN
I
Microphone input signal
2
MIC_RET
-
Microphone reference ground
1
GND
-
Ground reference
2
IO1
I/O
General purpose I/O (3.0 VDC TTL level)
(Also used for on-board green LED D6)
3
IO2
I/O
General purpose I/O (3.0 VDC TTL level)
4
IO3
I/O
General purpose I/O (3.0 VDC TTL level)
Note: the GPIO (J13.2, J13.3, and J13.4) are at nominal 3.0VDC level. Do not connect 5VDC
directly to these pins!
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Recommended Operating Conditions
The EasyVR Shield version 2.0 and earlier is compatible only with Arduino boards at 5V I/O voltage levels.
Warning: Do not connect the EasyVR Shield to systems with 3.3V I/O levels!
You may use the EasyVR Module on systems with an incompatible I/O voltage.
Jumper settings
J12 – Operating mode
This jumper selects the operating mode of the EasyVR Shield and it can be placed in one of four positions:
o
o
o
o
UP – Flash update mode
Use it for firmware updates or to download sound table data to the on-board flash memory from the
EasyVR Commander. In this mode, the Arduino controller is held in reset and only the embedded
USB/Serial adapter is used. The EasyVR module is set in boot mode.
PC – PC connection mode
Use it for direct connection with the EasyVR Commander. In this mode, the Arduino controller is held
in reset and only the embedded USB/Serial adapter is used.
HW – Hardware serial mode
Use it for controlling the EasyVR module from your Arduino sketch through the hardware serial port
(using pins 0-1).
SW – Software serial mode
Use it for controlling the EasyVR module from your Arduino sketch through a software serial port
(using pins 12-13). You can also connect the EasyVR Commander in this mode, provided that the
running sketch implements bridge mode (see libraries).
Note: on the Arduino Leonardo you can use the jumper only in the HW position, both for
Arduino sketches and for connection with the EasyVR Commander.
Please make sure you have the latest EasyVR Arduino library (version 1.4 and later).
LEDs
A green LED (D6) is connected to IO1 pin and can be controlled by the user’s program to show feedback
during recognition tasks, for example. This LED is on by default after reset or power up.
The red LED (D5) lights up when you set the shield to flash update mode (see Jumper settings).
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Quick start guide for using the Shield
Follow these few steps to start playing with your EasyVR Shield and Arduino:
1. Insert the EasyVR Shield on top of your Arduino board
2. If you want audio output, either wire an 8Ω speaker into the screw terminals (J10) or connect
headphones to the 3.5mm output jack (J9)
3. Connect the supplied microphone to the MIC IN (J11) connector
4
4. Install the EasyVR Arduino libraries on your PC (details at http://arduino.cc/en/Guide/Libraries)
5. Connect your Arduino board to your PC via USB.
With Arduino Leonardo
Test the Shield with Arduino:
1.
2.
3.
4.
5.
Make sure the jumper (J12) is in the HW position
Open the example sketch TestEasyVR from your IDE menu “File” > “Examples” > “EasyVR”
Upload the sketch and open the “Serial Monitor” window
Send a question mark “?” (without quotes)
After a few seconds you should receive an “EasyVR detected” message
Test the Shield with the EasyVR Commander:
1. Make sure the jumper (J12) is in the HW position
2. Close the serial monitor window in the Arduino IDE
3. Open the EasyVR Commander and connect to the Arduino serial port (see Getting Started)
With Arduino 2009 – Uno – Mega
To check everything is working fine:
1. Make sure the jumper (J12) is in the PC position
2. Open the EasyVR Commander and connect to the Arduino serial port (see Getting Started)
4
The Arduino library archive file is installed in the EasyVR Commander program folder.
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To download a new sound-table:
1. Make sure the jumper (J12) is in the UP position
2. Open the EasyVR Commander and select the Arduino serial port
3. While disconnected choose “Update Custom Data” from the “File” menu (see Using Custom Data)
To test the Shield with your Arduino programming IDE:
1.
2.
3.
4.
Set the jumper (J12) in the SW position
Open the example sketch TestEasyVR from your IDE menu “File” > “Examples” > “EasyVR”
Upload the sketch and open the “Serial Monitor” window
See comments on top of the sketch for usage details
Keep in mind that if you have a “bridge” code running (all examples do) on Arduino, you can connect the
EasyVR Commander leaving the jumper in the SW position, just make sure the monitor window is closed.
When the EasyVR Commander is connected, you can also generate a template code for Arduino, that will
use the provided libraries (see EasyVR Arduino Library Documentation). All you need is to write actions for
each recognized command.
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EasyVR Programming
Communication Protocol
Introduction
Communication with the EasyVR module uses a standard UART interface compatible with 3.3-5V
TTL/CMOS logical levels, according to the powering voltage VCC.
A typical connection to an MCU-based host:
EasyVR
Host MCU
3.3V – 5V
GND
TX
RX
VCC
GND
ERX
ETX
The initial configuration at power on is 9600 baud, 8 bit data, No parity, 1 bit stop. The baud rate can be
changed later to operate in the range 9600 - 115200 baud.
The communication protocol only uses printable ASCII characters, which can be divided in two main groups:


Command and status characters, respectively on the TX and RX lines, chosen among lower-case
letters.
Command arguments or status details, again on the TX and RX lines, spanning the range of capital
letters.
Each command sent on the TX line, with zero or more additional argument bytes, receives an answer on the
RX line in the form of a status byte followed by zero or more arguments.
There is a minimum delay before each byte sent out from the EasyVR module to the RX line, that is initially
set to 20 ms and can be selected later in the ranges 0 - 9 ms, 10 - 90 ms, and 100 ms - 1 s. That accounts
for slower or faster host systems and therefore suitable also for software-based serial communication (bitbanging).
Since the EasyVR serial interface also is software-based, a very short delay might be needed before
transmitting a character to the module, especially if the host is very fast, to allow the EasyVR to get back
listening to a new character.
The communication is host-driven and each byte of the reply to a command has to be acknowledged by the
host to receive additional status data, using the space character. The reply is aborted if any other character
is received and so there is no need to read all the bytes of a reply if not required.
Invalid combinations of commands or arguments are signaled by a specific status byte, that the host should
be prepared to receive if the communication fails. Also a reasonable timeout should be used to recover from
unexpected failures.
If the host does not send all the required arguments of a command, the command is ignored by the module,
without further notification, and the host can start sending another command.
The module automatically goes to lowest power sleep mode after power on. To initiate communication, send
any character to wake-up the module.
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Arguments Mapping
Command or status messages sent over the serial link may have one or more numerical arguments in the
range -1 to 31, which are encoded using mostly characters in the range of uppercase letters. These are
some useful constants to handle arguments easily:
ARG_MIN
'@' (40h)
Minimum argument value (-1)
ARG_MAX
'`' (60h)
Maximum argument value (+31)
ARG_ZERO
'A' (41h)
Zero argument value (0)
ARG_ACK
' ' (20h)
Read more status arguments
Having those constants defined in your code can simplify the validity checks and the encoding/decoding
process. For example (in pseudo-code):
# encode value 5
FIVE = 5 + ARG_ZERO
# decode value 5
FIVE – ARG_ZERO = 5
# validity check
IF ARG < ARG_MIN OR ARG > ARG_MAX THEN ERROR
Just to make things clearer, here is a table showing how the argument mapping works:
ASCII
'@'
'A'
'B'
'C'
...
'Y'
'Z'
'^'
'['
'\'
']'
'_'
'`'
HEX
40
41
42
43
...
59
5A
5B
5C
5D
5E
5F
60
Value
-1
0
1
2
...
24
25
26
27
28
29
30
31
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Command Details
This section describes the format of all the command strings accepted by the module. Please note that
numeric arguments of command requests are mapped to upper-case letters (see above section).
CMD_BREAK
Abort recognition, training or playback in progress if any or do nothing
'b' (62h)
Known issues:
In firmware ID 0, any other character received during recognition will prevent this command from
stopping recognition that will continue until timeout or other recognition results.
Expected replies: STS_SUCCESS, STS_INTERR
CMD_SLEEP
's' (73h)
Go to the specified power-down mode
Sleep mode (0-8):
0 = wake on received character only
1 = wake on whistle or received character
[1]
2 = wake on loud sound or received character
3-5 = wake on double clap (with varying sensitivity) or received character
6-8 = wake on triple clap (with varying sensitivity) or received character
Expected replies: STS_SUCCESS, STS_AWAKEN
CMD_LEVEL
'v' (76h)
Set SD level
Strictness control setting (1-5):
1 = easy
[1]
2 = default
5 = hard
A higher setting will result in more recognition errors.
Expected replies: STS_SUCCESS
CMD_KNOB
'k' (6Bh)
[1]
Set SI knob to specified level
Confidence threshold level (0-4):
0 = loosest:more valid results
2 = typical value (default)
4 = tightest:fewer valid results
Note: knob is ignored for trigger words
Expected replies: STS_SUCCESS
CMD_MIC_DIST
'k' (6Bh)
Set the microphone operating distance
[1]
Fixed to (-1)
Distance settings (1-3):
1 = “headset” (around 5cm from speaker’s mouth)
[2]
2 = “arms length” (default setting, from about 50cm to 1m)
3 = “far mic” (up to around 3m)
Expected replies: STS_SUCCESS
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CMD_LANGUAGE
'l' (6Ch)
Set SI language
Language:
0 = English
1 = Italian
[1]
2 = Japanese
3 = German
4 = Spanish
5 = French
Expected replies: STS_SUCCESS
CMD_TIMEOUT
'o' (6Fh)
[1]
Set recognition timeout
Timeout (-1 = default, 0 = infinite, 1-31 = seconds)
Expected replies: STS_SUCCESS
CMD_RECOG_SI
'i' (69h)
[1]
Activate SI recognition from specified word set
Word set index (0-3)
Expected replies: STS_SIMILAR, STS_TIMEOUT, STS_ERROR
CMD_TRAIN_SD
't' (74h)
Train specified SD/SV command
[1]
Group index (0 = trigger, 1-15 = generic, 16 = password)
[2]
Command position (0-31)
Expected replies: STS_SUCCESS, STS_RESULT, STS_SIMILAR, STS_TIMEOUT, STS_ERROR
CMD_GROUP_SD
'g' (67h)
Insert new SD/SV command
[1]
Group index (0 = trigger, 1-15 = generic, 16 = password)
[2]
Position (0-31)
Expected replies: STS_SUCCESS, STS_OUT_OF_MEM
CMD_UNGROUP_SD
'u' (75h)
Remove SD/SV command
[1]
Group index (0 = trigger, 1-15 = generic, 16 = password)
[2]
Position (0-31)
Expected replies: STS_SUCCESS
CMD_RECOG_SD
'd' (64h)
[1]
Activate SD/SV recognition
Group index (0 = trigger, 1-15 = generic, 16 = password)
Expected replies: STS_RESULT, STS_SIMILAR, STS_TIMEOUT, STS_ERROR
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CMD_ERASE_SD
'e' (65h)
Erase training of SD/SV command
[1]
Group index (0 = trigger, 1-15 = generic, 16 = password)
[2]
Command position (0-31)
Expected replies: STS_SUCCESS
CMD_NAME_SD
'n' (6Eh)
Label SD/SV command
[1]
Group index (0 = trigger, 1-15 = generic, 16 = password)
[2]
Command position (0-31)
[3]
Length of label (0-31)
[4-n]
Text for label (ASCII characters from 'A' to '`')
Expected replies: STS_SUCCESS
CMD_COUNT_SD
'c' (63h)
[1]
Request count of SD/SV commands in the specified group
Group index (0 = trigger, 1-15 = generic, 16 = password)
Expected replies: STS_COUNT
CMD_DUMP_SD
'p' (70h)
Read SD/SV command data (label and training)
[1]
Group index (0 = trigger, 1-15 = generic, 16 = password)
[2]
Command position (0-31)
Expected replies: STS_DATA
CMD_MASK_SD
'm' (6Dh)
Request bit-mask of non-empty groups
Expected replies: STS_MASK
CMD_RESETALL
'r' (72h)
Reset all commands and groups
'R' (52h)
Confirmation character
Expected replies: STS_SUCCESS
CMD_ID
'x' (78h)
Request firmware identification
Expected replies: STS_ID
CMD_DELAY
'y' (79h)
[1]
Set transmit delay
Time (0-10 = 0-10 ms, 11-19 = 20-100 ms, 20-28 = 200-1000 ms)
Expected replies: STS_SUCCESS
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CMD_BAUDRATE
'a' (61h)
Set communication baud-rate
Speed mode:
1 = 115200
2 = 57600
[1]
3 = 38400
6 = 19200
12 = 9600
Expected replies: STS_SUCCESS
CMD_QUERY_IO
'q' (71h)
Configure, query or modify general purpose I/O pins
[1]
Pin number (1 = pin IO1, 2 = pin IO2, 3 = pin IO3)
Pin mode (0 = output low, 1 = output high, 2 = input*, 3 = input strong**, 4 = input weak***)
* High impedance input (no pull-up)
[2]
**Strong means ~10K internal pull-up
***Weak means ~200K internal pull-up (default after power up)
Expected replies: STS_SUCCESS (mode 0-1), STS_PIN (mode 2-4)
CMD_PLAY_SX
'w' (77h)
[1-2]
[3]
Wave table entry playback
Two positive values that form a 10-bit index to the sound table (index = [1] * 32 + [2], 0 = built-in
“beep”, 1-1023 = sound index)
Playback volume (0-31, 0 = min volume, 15 = full scale, 31 = double gain)
Expected replies: STS_SUCCESS, STS_ERROR
CMD_PLAY_DTMF
'w' (77h)
[1]
[2]
[3]
Play a DTMF key tone or dial tone
Fixed to (-1)
Index of phone tone to play (0-9 for digits, 10 for '*' key, 11 for '#' key and 12-15 for extra keys
'A' to 'D', -1 for the dial tone)
Tone duration minus 1 (0-31 in 40ms units for keys, in seconds for the dial tone)
Expected replies: STS_SUCCESS
CMD_DUMP_SX
'h' (68h)
Read wave table data
Expected replies: STS_TABLE_SX, STS_OUT_OF_MEM
CMD_DUMP_SI
'h' (68h)
Read custom and built-in grammars data
Index of SI grammar to read (0-31) or (-1) to get the total count of SI grammars (including the
[1]
first 4 built-in wordsets)
Expected replies: STS_GRAMMAR, STS_COUNT
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CMD_SEND_SN
'h' (68h)
Send a SonicNet
TM
token
[1]
Length of token (4 or 8 in bits)
Two positive values that form an 8-bit token index (index = [2] * 32 + [3], 0-15 for 4-bit tokens or
[2-3]
0-255 for 8-bits tokens)
Two positive values that form a 10-bit delay for token output since the next sound playback
[4-5]
(delay = [4] * 32 + [5], 0 = send immediately, 1-1023 = delay in units of 27.46ms)
Expected replies: STS_SUCCESS
CMD_RECV_SN
'h' (68h)
[1]
Receive a SonicNet
TM
token
Length of token (4 or 8 in bits)
[2]
Rejection level (0-2 = higher values mean fewer results, 1 = default)
Two positive values that form a 10-bit timeout for token detection (timeout = [3] * 32 + [4], 0 =
[3-4]
wait forever, 1-1023 = timeout in units of 27.46ms)
Expected replies: STS_TOKEN, STS_TIMEOUT
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Status Details
Replies to commands follow this format. Please note that numeric arguments of status replies are mapped to
upper-case letters (see the related section).
STS_MASK
'k' (6Bh)
[1-8]
Mask of non-empty groups
4-bit values that form 32-bit mask, LSB first
In reply to: CMD_MASK_SD
STS_COUNT
'c' (63h)
[1]
Count of commands or total number of SI grammars
Integer (0-31 = command/grammar count, -1 = 32 commands/grammars)
In reply to: CMD_COUNT_SD, CMD_DUMP_SI
STS_AWAKEN
'w' (77h)
Wake-up (back from power-down mode)
In reply to: Any character after power on or sleep mode
STS_DATA
'd' (64h)
[2]
Provide command data
Training information (-1=empty, 1-6 = training count, +8 = SD/SV conflict, +16 = SI conflict)
Known issues:
In firmware ID 0, command creation/deletion might cause other empty commands training count
to change to 7. Treat count values of -1, 0 or 7 as empty training markers. Never train
commands more than 2 or 3 times.
Conflicting command position (0-31, only meaningful when trained)
[3]
Length of label (0-31)
[1]
[4-n]
Text of label (ASCII characters from 'A' to '`')
In reply to: CMD_DUMP_SD
STS_ERROR
'e' (65h)
[1-2]
Signal recognition error
Two positive values that form an 8-bit error code (error = [1] * 16 + [2], see appendix)
In reply to: CMD_RECOG_SI, CMD_RECOG_SD, CMD_TRAIN_SD, CMD_PLAY_SX
STS_INVALID
'v' (76h)
Invalid command or argument
In reply to: Any invalid command or argument
STS_TIMEOUT
't' (74h)
Timeout expired
In reply to: CMD_RECOG_SI, CMD_RECOG_SD, CMD_TRAIN_SD
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STS_INTERR
'i' (69h)
Interrupted recognition
In reply to: CMD_BREAK while in training, recognition or playback
STS_SUCCESS
'o' (6Fh) OK or no errors status
In reply to: CMD_BREAK, CMD_DELAY, CMD_BAUDRATE, CMD_TIMEOUT, CMD_KNOB, CMD_LEVEL,
CMD_LANGUAGE, CMD_SLEEP, CMD_GROUP_SD, CMD_UNGROUP_SD, CMD_ERASE_SD,
CMD_NAME_SD, CMD_RESETALL, CMD_QUERY_IO, CMD_PLAY_SX
STS_RESULT
'r' (72h)
[1]
Recognized SD/SV command or Training similar to SD/SV command
Command position (0-31)
In reply to: CMD_RECOG_SD, CMD_TRAIN_SD
STS_SIMILAR
's' (73h)
[1]
Recognized SI word or Training similar to SI word
Word index (0-31)
In reply to: CMD_RECOG_SI, CMD_RECOG_SD, CMD_TRAIN_SD
STS_OUT_OF_MEM
'm' (6Dh)
Memory error (no more room for commands or sound table not present)
In reply to: CMD_GROUP_SD, CMD_DUMP_SX
STS_ID
'x' (78h)
[1]
Provide firmware identification
Version identifier (0)
In reply to: CMD_ID
STS_PIN
'p' (70h)
[1]
Provide pin input status
Logic level (0 = input low, 1 = input high)
In reply to: CMD_QUERY_IO
STS_TABLE_SX
'd' (64h)
[1-2]
[3]
[4-n]
Provide sound table data
Two positive values that form a 10-bit count of entries in the sound table (count = [1] * 32 + [2])
Length of table name (0-31)
Text of table name (ASCII characters from 'A' to '`')
In reply to: CMD_DUMP_SX
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STS_GRAMMAR
'z' (7Ah)
Provide custom grammar data
[1]
Some flags for this grammar (currently16 is returned for trigger grammars, 0 for commands)
[2]
Number of commands in this grammar (0-31)
[3]
Length of first command label (0-31)
[4-n]
Text of first command label (ASCII characters from 'A' to '`')
…
Repeat last two fields for all the commands in this grammar
In reply to: CMD_DUMP_SI
STS_TOKEN
'f' (66h)
TM
Detected a SonicNet token
Two positive values that form the index of a received token (index = [1] * 32 + [2], 0-15 for 4-bit
[1-2]
tokens or 0-255 for 8-bits tokens)
In reply to: CMD_RECV_SN
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Communication Examples
These are some examples of actual command and status characters exchanged with the EasyVR module by
host programs and the expected program flow with pseudo-code sequences.
The pseudo-instruction SEND transmits the specified character to the module, while RECEIVE waits for a
reply character (a timeout is not explicitly handled for simple commands, but should be always implemented
if possible).
Also, the OK and ERROR routines are not explicitly defined, since they are host and programming language
dependent, but appropriate code should be written to handle both conditions.
Lines beginning with a # (sharp) character are comments.
Please note that in a real programming language it would be best to define some constants for the command
and status characters, as well as for mapping numeric arguments, that would be used throughout the
program, to minimize the chance of repetition errors and clarify the meaning of the code.
See the Protocol header file for sample definitions that can be used in a C language environment.
Here below all the characters sent and received are written explicitly in order to clarify the communication
protocol detailed in the previous sections.
Recommended wake up procedure
# wake up or interrupt recognition or do nothing
# (uses a timeout or max repetition count)
DO
SEND 'b'
LOOP UNTIL RECEIVE = 'o'
Recommended setup procedure
# ask firmware id
SEND 'x'
IF NOT RECEIVE = 'x' THEN ERROR
# send ack and read status (expecting id=0)
SEND ' '
id = RECEIVE
IF id = 'A' THEN
# it’s a VRbot
ELSE IF id = 'B' THEN
# it’s an EasyVR
ELSE
# next generation?
END IF
# set language for SI recognition (Japanese)
SEND 'l'
SEND 'C'
IF RECEIVE = 'o' THEN OK ELSE ERROR
# set timeout (5 seconds)
SEND 'o'
SEND 'F'
IF RECEIVE = 'o' THEN OK ELSE ERROR
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Recognition of a built-in or custom SI command
# start recognition in wordset 1
SEND 'i'
SEND 'B'
# wait for reply:
# (if 5s timeout has been set, wait for max 6s then abort
# otherwise trigger recognition could never end)
result = RECEIVE
IF result = 's' THEN
# successful recognition, ack and read result
SEND ' '
command = RECEIVE – 'A'
# perform actions according to command
ELSE IF result = 't' THEN
# timed out, no word spoken
ELSE IF result = 'e' THEN
# error code, ack and read which one
SEND ' '
error = (RECEIVE – 'A') * 16
SEND ' '
error = error + (RECEIVE – 'A')
# perform actions according to error
ELSE
# invalid request or reply
ERROR
END IF
Adding a new SD command
# insert command 0 in group 3
SEND 'g'
SEND 'D'
SEND 'A'
IF RECEIVE = 'o' THEN OK ELSE ERROR
# set command label to “ARDUINO_2009”
SEND 'g'
SEND 'D'
SEND 'A'
SEND 'Q'
# name length (16 characters, digits count twice)
SEND 'A'
SEND 'R'
SEND 'D'
SEND 'U'
SEND 'I'
SEND 'N'
SEND 'O'
SEND '_'
# encode each digit with a ^ prefix
# followed by the digit mapped to upper case letters
SEND '^'
SEND 'C'
SEND '^'
SEND 'A'
SEND '^'
SEND 'A'
SEND '^'
SEND 'J'
IF RECEIVE = 'o' THEN OK ELSE ERROR
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Training an SD command
# repeat the whole training procedure twice for best results
# train command 0 in group 3
SEND 't'
SEND 'D'
SEND 'A'
# wait for reply:
# (default timeout is 3s, wait for max 1s more then abort)
result = RECEIVE
IF RECEIVE = 'o' THEN
# training successful
OK
ELSE IF result = 'r' THEN
# training saved, but spoken command is similar to
# another SD command, read which one
SEND ' '
command = RECEIVE – 'A'
# may notify user and erase training or keep it
ELSE IF result = 's' THEN
# training saved, but spoken command is similar to
# another SI command (always trigger, may skip reading)
SEND ' '
command = RECEIVE – 'A'
# may notify user and erase training or keep it
ELSE IF result = 't' THEN
# timed out, no word spoken or heard
ELSE IF result = 'e' THEN
# error code, ack and read which one
SEND ' '
error = (RECEIVE – 'A') * 16
SEND ' '
error = error + (RECEIVE – 'A')
# perform actions according to error
ELSE
# invalid request or reply
ERROR
END IF
Recognition of an SD command
# start recognition in group 1
SEND 'd'
SEND 'B'
# wait for reply:
result = RECEIVE
IF result = 'r' THEN
# successful recognition, ack and read result
SEND ' '
command = RECEIVE – 'A'
# perform actions according to command
ELSE IF result = 't' THEN
# timed out, no word spoken
ELSE IF result = 'e' THEN
# error code, ack and read which one
SEND ' '
error = (RECEIVE – 'A') * 16
SEND ' '
error = error + (RECEIVE – 'A')
# perform actions according to error
ELSE
# invalid request or reply
ERROR
END IF
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Read used command groups
# request mask of groups in use
SEND 'm'
IF NOT RECEIVE = 'k' THEN ERROR
# read mask to 32 bits variable
# in 8 chunks of 4 bits each
SEND ' '
mask = (RECEIVE – 'A')
SEND ' '
mask = mask + (RECEIVE – 'A') * 24
SEND ' '
mask = mask + (RECEIVE – 'A') * 28
...
SEND ' '
mask = mask + (RECEIVE – 'A') * 224
Read how many commands in a group
# request command count of group 3
SEND 'c'
SEND 'D'
IF NOT RECEIVE = 'c' THEN ERROR
# ack and read count
SEND ' '
count = RECEIVE - 'A'
IF count = -1 THEN count = 32
Read a user defined command group
# dump command 0 in group 3
SEND 'p'
SEND 'D'
SEND 'A'
IF NOT RECEIVE = 'd' THEN ERROR
# read command data
SEND ' '
training = RECEIVE – 'A'
# extract training count (2 for a completely trained command)
tr_count = training AND 7
# extract flags for conflicts (SD or SI)
tr_flags = training AND 24
# read index of conflicting command (same group) if any
SEND ' '
conflict = RECEIVE – 'A'
# read label length
SEND ' '
length = RECEIVE – 'A'
# read label text
FOR i = 0 TO length - 1
SEND ' '
label[i] = RECEIVE
# decode digits
IF label[i] = '^' THEN
SEND ' '
label[i] = RECEIVE – 'A' + '0'
END IF
NEXT
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Use general purpose I/O pins
# set IO1 pin to logic low level
SEND 'q'
SEND 'B'
SEND 'A'
IF RECEIVE = 'o' THEN OK ELSE ERROR
# set IO2 pin to logic high level
SEND 'q'
SEND 'C'
SEND 'B'
IF RECEIVE = 'o' THEN OK ELSE ERROR
# set IO2 pin as input with strong pull-up and read state
SEND 'q'
SEND 'C'
SEND 'D'
IF NOT RECEIVE = 'p' THEN ERROR
# ack and read logic level
SEND ' '
pin_level = RECEIVE – 'A'
# set IO3 pin as high impedance input (reading state is optional)
SEND 'q'
SEND 'D'
SEND 'C'
IF NOT RECEIVE = 'p' THEN ERROR
Use custom sound playback
# play a beep at full volume (works with any or no table)
SEND 'w'
SEND 'A'
SEND 'A'
SEND 'P'
IF RECEIVE = 'o' THEN OK ELSE ERROR
# play entry 13 at half volume
SEND 'w'
SEND 'A'
SEND 'N'
SEND 'H'
IF RECEIVE = 'o' THEN OK ELSE ERROR
# play entry 123 (=3*32+26) at max volume
SEND 'w'
SEND 'A' + 3
SEND 'A' + 26
SEND 'A' + 31
IF RECEIVE = 'o' THEN OK ELSE ERROR
Read sound table
# dump sound table
SEND 'h'
IF NOT RECEIVE = 'h' THEN ERROR
# read count of entries and name length
SEND ' '
count = (RECEIVE – 'A') * 32
SEND ' '
count = count + (RECEIVE – 'A')
SEND ' '
length = RECEIVE – 'A'
# read name text
FOR i = 0 TO length - 1
SEND ' '
label[i] = RECEIVE
NEXT
User Manual (3.6.7)
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37
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Built-in Command Sets
In the tables below a list of all built-in commands for each supported language, along with group index
(trigger or word set), command index and language identifier to use with the communication protocol.
Language
0
Trigger
Word
set
0
1
2
3
38
1
Command English
Italian
Index
(US)
2
3
4
5
Japanese
(Rōmaji)
German
Spanish
French
0
robot
robot
ロボット
robotto
roboter
robot
robot
0
action
azione
アクション
acution
aktion
acción
action
1
move
vai
進め
susu-me
gehe
muévete
bouge
2
turn
gira
曲がれ
magare
wende
gira
tourne
3
run
corri
走れ
hashire
lauf
corre
cours
4
look
guarda
見ろ
miro
schau
mira
regarde
5
attack
attacca
攻撃
kougeki
attacke
ataca
attaque
6
stop
fermo
止まれ
tomare
halt
para
arrête
7
hello
ciao
こんにちは
konnichiwa
hallo
hola
salut
0
left
a sinistra
左
hidari
nach links
a la izquierda
à gauche
1
right
a destra
右
migi
nach rechts
a la derecha
à droite
2
up
in alto
上
ue
hinauf
arriba
vers le
haut
3
down
in basso
下
shita
hinunter
abajo
vers le bas
4
forward
avanti
前
mae
vorwärts
adelante
en avant
5
backward indietro
後ろ
ushiro
rückwärts
atrás
en arrière
0
zero
zero
ゼロ
zero
null
cero
zéro
1
one
uno
一
ichi
eins
uno
un
2
two
due
二
ni
zwei
dos
deux
3
three
tre
三
san
drei
tres
trois
4
four
quattro
四
yon
vier
cuatro
quatre
5
five
cinque
五
go
fünf
cinco
cinq
6
six
sei
六
roku
sechs
seis
six
7
seven
sette
七
nana
sieben
siete
sept
8
eight
otto
八
hachi
acht
ocho
huit
9
nine
nove
九
kyu
neun
nueve
neuf
10
ten
dieci
十
jyuu
zehn
diez
dix
EasyVR 2.0
User Manual (3.6.7)
www.veear.eu
Error codes
Below the list of the most useful error codes that may be returned by training or recognizing commands.
03h
ERR_DATACOL_TOO_NOISY
too noisy
04h
ERR_DATACOL_TOO_SOFT
spoke too soft
05h
ERR_DATACOL_TOO_LOUD
spoke too loud
06h
ERR_DATACOL_TOO_SOON
spoke too soon
07h
ERR_DATACOL_TOO_CHOPPY
too many segments/too complex
11h
ERR_RECOG_FAIL
recognition failed
12h
ERR_RECOG_LOW_CONF
recognition result doubtful
13h
ERR_RECOG_MID_CONF
recognition result maybe
14h
ERR_RECOG_BAD_TEMPLATE
invalid SD/SV command stored in memory
17h
ERR_RECOG_DURATION
bad pattern durations
4Ah
ERR_SYNTH_BAD_VERSION
bad release number in speech file
4Eh
ERR_SYNTH_BAD_MSG
bad data in speech file or invalid compression
80h
ERR_NOT_A_WORD
recognized word is not in vocabulary
The first group of codes (03h – 07h) is due to errors in the way of speaking to the EasyVR or disturbances in
the acquired audio signal that may depend on the surrounding environment.
The second group (11h – 13h) indicates an insufficient score of the recognized word (from lowest to highest).
Acceptance of lower score results may be allowed by lowering the “knob” or “level” settings, respectively for
built-in and custom commands (see CMD_KNOB and CMD_LEVEL).
A third group of codes (14h – 17h) reports errors in the stored commands that may be due to memory
corruption. We suggest you check power level and connections, then erase all the commands in the faulty
group and train them again.
The fourth group (4Ah – 4Eh) deals with errors in the compressed sound data, either because the wrong
TM
version of the QuickSynthesis tool has been used to generate the sound table or because a not supported
compression scheme has been selected (or data is generically invalid).
The last code (80h) means that a word has been recognized that is not in the specified built-in sets. This is
due to how Speaker Independent recognition works and should be ignored.
User Manual (3.6.7)
EasyVR 2.0
39
www.veear.eu
Protocol header file
This file “protocol.h” can be used with applications written in the C language. You can download a recent
copy from the VeeaR website.
#ifndef PROTOCOL_H
#define PROTOCOL_H
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
#define
CMD_BREAK
CMD_SLEEP
CMD_KNOB
CMD_MIC_DIST
CMD_LEVEL
CMD_LANGUAGE
CMD_TIMEOUT
CMD_RECOG_SI
CMD_TRAIN_SD
CMD_GROUP_SD
CMD_UNGROUP_SD
CMD_RECOG_SD
CMD_ERASE_SD
CMD_NAME_SD
CMD_COUNT_SD
CMD_DUMP_SD
CMD_MASK_SD
CMD_RESETALL
CMD_ID
CMD_DELAY
CMD_BAUDRATE
CMD_QUERY_IO
CMD_PLAY_SX
CMD_PLAY_DTMF
CMD_DUMP_SX
CMD_DUMP_SI
CMD_SEND_SN
CMD_RECV_SN
'b'
's'
'k'
'k'
'v'
'l'
'o'
'i'
't'
'g'
'u'
'd'
'e'
'n'
'c'
'p'
'm'
'r'
'x'
'y'
'a'
'q'
'w'
'w'
'h'
'z'
'j'
'f'
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
abort recog or ping
go to power down
set si knob <1>
set microphone (<1>=-1) distance <2>
set sd level <1>
set si language <1>
set timeout <1>
do si recog from ws <1>
train sd command at group <1> pos <2>
insert new command at group <1> pos <2>
remove command at group <1> pos <2>
do sd recog at group <1> (0 = trigger mixed si/sd)
reset command at group <1> pos <2>
label command at group <1> pos <2> with length <3> name <4-n>
get command count for group <1>
read command data at group <1> pos <2>
get active group mask
reset all commands and groups
get version id
set transmit delay <1> (log scale)
set baudrate <1> (bit time, 1=>115200)
configure, read or write I/O pin <1> of type <2>
wave table entry <1-2> (10-bit) playback at volume <3>
play (<1>=-1) dial tone <2> for duration <3>
dump wave table entries
dump si settings for ws <1> (or total ws count if -1)
send sonicnet token with bits <1> index <2-3> at time <4-5>
receive sonicnet token with bits <1> rejection <2> timeout <3-4>
#define STS_MASK
#define STS_COUNT
#define STS_AWAKEN
#define STS_DATA
(counted string)
#define STS_ERROR
#define STS_INVALID
#define STS_TIMEOUT
#define STS_INTERR
#define STS_SUCCESS
#define STS_RESULT
#define STS_SIMILAR
#define STS_OUT_OF_MEM
#define STS_ID
#define STS_PIN
#define STS_TABLE_SX
string)
#define STS_GRAMMAR
counted strings)
#define STS_TOKEN
'k'
'c'
'w'
'd'
//
//
//
//
mask of active groups <1-8>
count of commands <1> (or number of ws <1>)
back from power down mode
provide training <1>, conflict <2>, command label <3-35>
'e'
'v'
't'
'i'
'o'
'r'
's'
'm'
'x'
'p'
'h'
//
//
//
//
//
//
//
//
//
//
//
signal error code <1-2>
invalid command or argument
timeout expired
back from aborted recognition (see 'break')
no errors status
recognised sd command <1> - training similar to sd <1>
recognised si <1> (in mixed si/sd) - training similar to si <1>
no more available commands (see 'group')
provide version id <1>
return pin state <1>
table entries count <1-2> (10-bit), table name <3-35> (counted
'z' // si grammar: flags <1>, word count <2>, labels... <3-35> (n
'f' // received sonicnet token <1-2>
// protocol arguments are in the range 0x40 (-1) to 0x60 (+31) inclusive
#define ARG_MIN
0x40
#define ARG_MAX
0x60
#define ARG_ZERO
0x41
#define ARG_ACK
0x20
// to read more status arguments
#endif //PROTOCOL_H
A better source of information and a reference protocol implementation for the C/C++ language and can be
found in the Arduino Library source.
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EasyVR Arduino Library Documentation
EasyVR Class Reference
Public Types
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enum ModuleId { VRBOT, EASYVR, EASYVR2 }
enum Language { ENGLISH, ITALIAN, JAPANESE, GERMAN, SPANISH, FRENCH }
enum Group { TRIGGER, PASSWORD }
enum Wordset { TRIGGER_SET, ACTION_SET, DIRECTION_SET, NUMBER_SET }
enum Knob { LOOSER, LOOSE, TYPICAL, STRICT, STRICTER }
enum Level { EASY, NORMAL, HARD, HARDER, HARDEST }
enum Baudrate { B115200, B57600, B38400, B19200, B9600 }
enum WakeMode { WAKE_ON_CHAR, WAKE_ON_WHISTLE, WAKE_ON_LOUDSOUND,
WAKE_ON_2CLAPS, WAKE_ON_3CLAPS }
enum ClapSense { CLAP_SENSE_LOW, CLAP_SENSE_MID, CLAP_SENSE_HIGH }
enum PinConfig { OUTPUT_LOW, OUTPUT_HIGH, INPUT_HIZ, INPUT_STRONG, INPUT_WEAK }
enum PinNumber { IO1, IO2, IO3 }
enum SoundVolume { VOL_MIN, VOL_HALF, VOL_FULL, VOL_DOUBLE }
enum SoundIndex { BEEP }
enum GrammarFlag { GF_TRIGGER }
enum RejectionLevel { REJECTION_MIN, REJECTION_AVG, REJECTION_MAX }
enum ErrorCode { ERR_DATACOL_TOO_LONG, ERR_DATACOL_TOO_NOISY,
ERR_DATACOL_TOO_SOFT, ERR_DATACOL_TOO_LOUD, ERR_DATACOL_TOO_SOON,
ERR_DATACOL_TOO_CHOPPY, ERR_DATACOL_BAD_WEIGHTS, ERR_DATACOL_BAD_SETUP,
ERR_RECOG_FAIL, ERR_RECOG_LOW_CONF, ERR_RECOG_MID_CONF,
ERR_RECOG_BAD_TEMPLATE, ERR_RECOG_BAD_WEIGHTS, ERR_RECOG_DURATION,
ERR_T2SI_EXCESS_STATES, ERR_T2SI_BAD_VERSION, ERR_T2SI_OUT_OF_RAM,
ERR_T2SI_UNEXPECTED, ERR_T2SI_OVERFLOW, ERR_T2SI_PARAMETER,
ERR_T2SI_NN_TOO_BIG, ERR_T2SI_NN_BAD_VERSION, ERR_T2SI_NN_NOT_READY,
ERR_T2SI_NN_BAD_LAYERS, ERR_T2SI_TRIG_OOV, ERR_T2SI_TOO_SHORT,
ERR_SYNTH_BAD_VERSION, ERR_SYNTH_ID_NOT_SET, ERR_SYNTH_TOO_MANY_TABLES,
ERR_SYNTH_BAD_SEN, ERR_SYNTH_BAD_MSG, ERR_CUSTOM_NOTA,
ERR_SW_STACK_OVERFLOW, ERR_INTERNAL_T2SI_BAD_SETUP }
Public Member Functions
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EasyVR (Stream &s)
bool detect ()
bool stop ()
int8_t getID ()
bool setLanguage (int8_t lang)
bool setTimeout (int8_t seconds)
bool setKnob (int8_t knob)
bool setLevel (int8_t level)
bool setDelay (uint16_t millis)
bool changeBaudrate (int8_t baud)
bool sleep (int8_t mode)
bool addCommand (int8_t group, int8_t index)
bool removeCommand (int8_t group, int8_t index)
bool setCommandLabel (int8_t group, int8_t index, const char *name)
bool eraseCommand (int8_t group, int8_t index)
bool getGroupMask (uint32_t &mask)
int8_t getCommandCount (int8_t group)
bool dumpCommand (int8_t group, int8_t index, char *name, uint8_t &training)
int8_t getGrammarsCount (void)
bool dumpGrammar (int8_t grammar, uint8_t &flags, uint8_t &count)
bool getNextWordLabel (char *name)
User Manual (3.6.7)
EasyVR 2.0
41
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void trainCommand (int8_t group, int8_t index)
void recognizeCommand (int8_t group)
void recognizeWord (int8_t wordset)
bool hasFinished ()
int8_t getCommand ()
int8_t getWord ()
int16_t getToken ()
int16_t getError ()
bool isTimeout ()
bool isConflict ()
bool isMemoryFull ()
bool setPinOutput (int8_t pin, int8_t value)
int8_t getPinInput (int8_t pin, int8_t config)
void detectToken (int8_t bits, int8_t rejection, uint16_t timeout)
void sendTokenAsync (int8_t bits, uint8_t token)
bool sendToken (int8_t bits, uint8_t token)
bool embedToken (int8_t bits, uint8_t token, uint16_t delay)
void playSoundAsync (int16_t index, int8_t volume)
bool playSound (int16_t index, int8_t volume)
bool dumpSoundTable (char *name, int16_t &count)
bool playPhoneTone (int8_t tone, uint8_t duration)
bool resetAll ()
Detailed Description
An implementation of the EasyVR communication protocol.
Member Enumeration Documentation
enum ModuleId
Module identification number (firmware version)
Enumerator:
VRBOT Identifies a VRbot module
EASYVR Identifies an EasyVR module
EASYVR2 Identifies an EasyVR module version 2
enum Language
Language to use for recognition of built-in words
Enumerator:
ENGLISH Uses the US English word sets
ITALIAN Uses the Italian word sets
JAPANESE Uses the Japanese word sets
GERMAN Uses the German word sets
SPANISH Uses the Spanish word sets
FRENCH Uses the French word sets
enum Group
Special group numbers for recognition of custom commands
Enumerator:
TRIGGER The trigger group (shared with built-in trigger word)
PASSWORD The password group (uses speaker verification technology)
42
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enum Wordset
Index of built-in word sets
Enumerator:
TRIGGER_SET The built-in trigger word set
ACTION_SET The built-in action word set
DIRECTION_SET The built-in direction word set
NUMBER_SET The built-in number word set
enum Knob
Confidence thresholds for the knob settings, used for recognition of built-in words or custom grammars
(not used for the mixed trigger group)
Enumerator:
LOOSER Lowest threshold, most results reported
LOOSE Lower threshold, more results reported
TYPICAL Typical threshold (deafult)
STRICT Higher threshold, fewer results reported
STRICTER Highest threshold, fewest results reported
enum Level
Strictness values for the level settings, used for recognition of custom commands (not used for the mixed
trigger group)
Enumerator:
EASY Lowest value, most results reported
NORMAL Typical value (default)
HARD Slightly higher value, fewer results reported
HARDER Higher value, fewer results reported
HARDEST Highest value, fewest results reported
enum Baudrate
Constants to use for baudrate settings
Enumerator:
B115200 115200 bps
B57600 57600 bps
B38400 38400 bps
B19200 19200 bps
B9600 9600 bps (default)
enum WakeMode
Constants for choosing wake-up method in sleep mode
Enumerator:
WAKE_ON_CHAR Wake up on any character received
WAKE_ON_WHISTLE Wake up on whistle or any character received
WAKE_ON_LOUDSOUND Wake up on a loud sound or any character received
WAKE_ON_2CLAPS Wake up on double hands-clap or any character received
WAKE_ON_3CLAPS Wake up on triple hands-clap or any character received
enum ClapSense
Hands-clap sensitivity for wakeup from sleep mode. Use in combination with WAKE_ON_2CLAPS or
WAKE_ON_3CLAPS
Enumerator:
CLAP_SENSE_LOW Lowest threshold
CLAP_SENSE_MID Typical threshold
CLAP_SENSE_HIGH Highest threshold
User Manual (3.6.7)
EasyVR 2.0
43
www.veear.eu
enum PinConfig
Pin configuration options for the extra I/O connector
Enumerator:
OUTPUT_LOW Pin is a low output (0V)
OUTPUT_HIGH Pin is a high output (3V)
INPUT_HIZ Pin is an high impedance input
INPUT_STRONG Pin is an input with strong pull-up (~10K)
INPUT_WEAK Pin is an input with weak pull-up (~200K)
enum PinNumber
Available pin numbers on the extra I/O connector
Enumerator:
IO1 Pin IO1
IO2 Pin IO2
IO3 Pin IO3
enum SoundVolume
Some quick volume settings for the sound playback functions (any value in the range 0-31 can be used)
Enumerator:
VOL_MIN Lowest volume (almost mute)
VOL_HALF Half scale volume (softer)
VOL_FULL Full scale volume (normal)
VOL_DOUBLE Double gain volume (louder)
enum SoundIndex
Special sound index values, always available even when no soundtable is present
Enumerator:
BEEP Beep sound
enum GrammarFlag
Flags used by custom grammars
Enumerator:
GF_TRIGGER A bit mask that indicate grammar is a trigger (opposed to commands)
enum RejectionLevel
Noise rejection level for SonicNet token detection (higher value, fewer results)
Enumerator:
REJECTION_MIN Lowest noise rejection, highest sensitivity
REJECTION_AVG Medium noise rejection, medium sensitivity
REJECTION_MAX Highest noise rejection, lowest sensitivity
enum ErrorCode
Error codes used by various functions
Enumerator:
ERR_DATACOL_TOO_LONG too long (memory overflow)
ERR_DATACOL_TOO_NOISY too noisy
ERR_DATACOL_TOO_SOFT spoke too soft
ERR_DATACOL_TOO_LOUD spoke too loud
ERR_DATACOL_TOO_SOON spoke too soon
ERR_DATACOL_TOO_CHOPPY too many segments/too complex
ERR_DATACOL_BAD_WEIGHTS invalid SI weights
ERR_DATACOL_BAD_SETUP invalid setup
ERR_RECOG_FAIL recognition failed
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ERR_RECOG_LOW_CONF recognition result doubtful
ERR_RECOG_MID_CONF recognition result maybe
ERR_RECOG_BAD_TEMPLATE invalid SD/SV template
ERR_RECOG_BAD_WEIGHTS invalid SI weights
ERR_RECOG_DURATION incompatible pattern durations
ERR_T2SI_EXCESS_STATES state structure is too big
ERR_T2SI_BAD_VERSION RSC code version/Grammar ROM dont match
ERR_T2SI_OUT_OF_RAM reached limit of available RAM
ERR_T2SI_UNEXPECTED an unexpected error occurred
ERR_T2SI_OVERFLOW ran out of time to process
ERR_T2SI_PARAMETER bad macro or grammar parameter
ERR_T2SI_NN_TOO_BIG layer size out of limits
ERR_T2SI_NN_BAD_VERSION net structure incompatibility
ERR_T2SI_NN_NOT_READY initialization not complete
ERR_T2SI_NN_BAD_LAYERS not correct number of layers
ERR_T2SI_TRIG_OOV trigger recognized Out Of Vocabulary
ERR_T2SI_TOO_SHORT utterance was too short
ERR_SYNTH_BAD_VERSION bad release number in speech file
ERR_SYNTH_ID_NOT_SET (obsolete) bad sentence structure
ERR_SYNTH_TOO_MANY_TABLES (obsolete) too many talk tables
ERR_SYNTH_BAD_SEN (obsolete) bad sentence number
ERR_SYNTH_BAD_MSG bad message data or SX technology files missing
ERR_CUSTOM_NOTA none of the above (out of grammar)
ERR_SW_STACK_OVERFLOW no room left in software stack
ERR_INTERNAL_T2SI_BAD_SETUP T2SI test mode error
Constructor & Destructor Documentation
EasyVR (Stream & s)
Creates an EasyVR object, using a communication object implementing the Stream interface (such as
HardwareSerial, or the modified SoftwareSerial and NewSoftSerial).
Parameters:
s
the Stream object to use for communication with the EasyVR module
Member Function Documentation
bool detect ()
Detects an EasyVR module, waking it from sleep mode and checking it responds correctly.
Return values:
true
if a compatible module has been found
bool stop ()
Interrupts pending recognition or playback operations.
Return values:
true
if the request is satisfied and the module is back to ready
int8_t getID ()
Gets the module identification number (firmware version).
Return values:
integer
User Manual (3.6.7)
is one of the values in ModuleId
EasyVR 2.0
45
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bool setLanguage (int8_t lang)
Sets the language to use for recognition of built-in words.
Parameters:
lang
(0-5) is one of values in Language
Return values:
true
if the operation is successful
bool setTimeout (int8_t seconds)
Sets the timeout to use for any recognition task.
Parameters:
seconds
Return values:
true
(0-31) is the maximum time the module keep listening for a word or a
command
if the operation is successful
bool setKnob (int8_t knob)
Sets the confidence threshold to use for recognition of built-in words.
Parameters:
knob
(0-4) is one of values in Knob
Return values:
true
if the operation is successful
bool setLevel (int8_t level)
Sets the strictness level to use for recognition of custom commands.
Parameters:
level
(1-5) is one of values in Level
Return values:
true
if the operation is successful
bool setDelay (uint16_t millis)
Sets the delay before any reply of the module.
Parameters:
millis
Return values:
true
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(0-1000) is the delay duration in milliseconds, rounded to 10 units in
range 10-100 and to 100 units in range 100-1000.
if the operation is successful
EasyVR 2.0
User Manual (3.6.7)
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bool changeBaudrate (int8_t baud)
Sets the new communication speed. You need to modify the baudrate of the underlying Stream object
accordingly, after the function returns successfully.
Parameters:
baud
is one of values in Baudrate
Return values:
true
if the operation is successful
bool sleep (int8_t mode)
Puts the module in sleep mode.
Parameters:
mode
Return values:
true
is one of values in WakeMode, optionally combined with one of the
values in ClapSense
if the operation is successful
bool addCommand (int8_t group, int8_t index)
Adds a new custom command to a group.
Parameters:
group
index
(0-16) is the target group, or one of the values in #Groups
(0-31) is the index of the command within the selected group
Return values:
true
if the operation is successful
bool removeCommand (int8_t group, int8_t index)
Removes a custom command from a group.
Parameters:
group
index
(0-16) is the target group, or one of the values in #Groups
(0-31) is the index of the command within the selected group
Return values:
true
if the operation is successful
bool setCommandLabel (int8_t group, int8_t index, const char * name)
Sets the name of a custom command.
Parameters:
group
index
name
(0-16) is the target group, or one of the values in #Groups
(0-31) is the index of the command within the selected group
is a string containing the label to be assigned to the specified command
Return values:
true
if the operation is successful
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bool eraseCommand (int8_t group, int8_t index)
Erases the training data of a custom command.
Parameters:
group
index
(0-16) is the target group, or one of the values in #Groups
(0-31) is the index of the command within the selected group
Return values:
true
if the operation is successful
bool getGroupMask (uint32_t & mask)
Gets a bit mask of groups that contain at least one command.
Parameters:
mask
is a variable to hold the group mask when the function returns
Return values:
true
if the operation is successful
int8_t getCommandCount (int8_t group)
Gets the number of commands in the specified group.
Parameters:
group
(0-16) is the target group, or one of the values in #Groups
Return values:
integer
is the count of commands (negative in case of errors)
bool dumpCommand (int8_t group, int8_t index, char * name, uint8_t & training)
Retrieves the name and training data of a custom command.
Parameters:
group
index
name
training
Return values:
true
(0-16) is the target group, or one of the values in #Groups
(0-31) is the index of the command within the selected group
points to an array of at least 32 characters that holds the command
label when the function returns
is a variable that holds the training count when the function returns.
Additional information about training is available through the functions
isConflict() and getWord() or getCommand()
if the operation is successful
int8_t getGrammarsCount (void )
Gets the total number of grammars available, including built-in and custom.
Return values:
integer
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is the count of grammars (negative in case of errors)
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bool dumpGrammar (int8_t grammar, uint8_t & flags, uint8_t & count)
Retrieves the contents of a built-in or a custom grammar. Command labels contained in the grammar
can be obtained by calling getNextWordLabel()
Parameters:
grammar
flags
count
Return values:
true
(0-31) is the target grammar, or one of the values in Wordset
is a variable that holds some grammar flags when the function returns.
See GrammarFlag
is a variable that holds the number of words in the grammar when the
function returns.
if the operation is successful
bool getNextWordLabel (char * name)
Retrieves the name of a command contained in a custom grammar. It must be called after
dumpGrammar()
Parameters:
name
Return values:
true
points to an array of at least 32 characters that holds the command
label when the function returns
if the operation is successful
void trainCommand (int8_t group, int8_t index)
Starts training of a custom command. Results are available after hasFinished() returns true.
Parameters:
group
index
(0-16) is the target group, or one of the values in #Groups
(0-31) is the index of the command within the selected group
Note:
The module is busy until training completes and it cannot accept other commands. You can interrupt
training with stop().
void recognizeCommand (int8_t group)
Starts recognition of a custom command. Results are available after hasFinished() returns true.
Parameters:
group
(0-16) is the target group, or one of the values in #Groups
Note:
The module is busy until recognition completes and it cannot accept other commands. You can
interrupt recognition with stop().
void recognizeWord (int8_t wordset)
Starts recognition of a built-in word. Results are available after hasFinished() returns true.
Parameters:
wordset
(0-3) is the target word set, or one of the values in Wordset, (4-31) is
the target custom grammar, if present
Note:
The module is busy until recognition completes and it cannot accept other commands. You can
interrupt recognition with stop().
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bool hasFinished ()
Polls the status of on-going recognition, training or asynchronous playback tasks.
Return values:
true
if the operation has completed
int8_t getCommand ()
Gets the recognised command index if any.
Return values:
(0-31)
is the command index if recognition is successful, (-1) if no command
has been recognized or an error occurred
int8_t getWord ()
Gets the recognised word index if any, from built-in sets or custom grammars.
Return values:
(0-31)
is the command index if recognition is successful, (-1) if no built-in word
has been recognized or an error occurred
int16_t getToken ()
Gets the index of the received SonicNet token if any.
Return values:
integer
is the index of the received SonicNet token (0-255 for 8-bit tokens or 015 for 4-bit tokens) if detection was successful, (-1) if no token has
been received or an error occurred
int16_t getError ()
Gets the last error code if any.
Return values:
(0-255)
is the error code, (-1) if no error occurred
bool isTimeout ()
Retrieves the timeout indicator.
Return values:
true
if a timeout occurred
bool isConflict ()
Retrieves the conflict indicator.
Return values:
true
is a conflict occurred during training. To know what caused the conflict,
use getCommand() and getWord() (only valid for triggers)
bool isMemoryFull ()
Retrieves the memory full indicator (only valid after addCommand() returned false).
Return values:
true
50
if a command could not be added because of memory size constaints
(up to 32 custom commands can be created)
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bool setPinOutput (int8_t pin, int8_t value)
Configures an I/O pin as an output and sets its value
Parameters:
pin
pin
Return values:
true
(1-3) is one of values in PinNumber
(0-1) is one of the output values in PinConfig, or Arduino style HIGH
and LOW macros
if the operation is successful
int8_t getPinInput (int8_t pin, int8_t config)
Configures an I/O pin as an input with optional pull-up and return its value
Parameters:
pin
pin
(1-3) is one of values in PinNumber
(2-4) is one of the input values in PinConfig
Return values:
integer
is the logical value of the pin
void detectToken (int8_t bits, int8_t rejection, uint16_t timeout)
Starts listening for a SonicNet token. Manually check for completion with hasFinished().
Parameters:
bits
rejection
timeout
(4 or 8) specifies the length of received tokens
(0-2) specifies the noise rejection level, it can be one of the values in
RejectionLevel
(1-28090) is the maximum time in milliseconds to keep listening for a
valid token or (0) to listen without time limits.
Note:
The module is busy until token detection completes and it cannot accept other commands. You can
interrupt listening with stop().
void sendTokenAsync (int8_t bits, uint8_t token)
Starts immediate playback of a SonicNet token. Manually check for completion with hasFinished().
Parameters:
bits
token
(4 or 8) specifies the length of trasmitted token
is the index of the SonicNet token to play (0-255 for 8-bit tokens or 0-15
for 4-bit tokens)
Note:
The module is busy until playback completes and it cannot accept other commands. You can
interrupt playback with stop().
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bool sendToken (int8_t bits, uint8_t token)
Plays a SonicNet token and waits for completion.
Parameters:
bits
token
Return values:
true
(4 or 8) specifies the length of trasmitted token
is the index of the SonicNet token to play (0-255 for 8-bit tokens or 0-15
for 4-bit tokens)
if the operation is successful
bool embedToken (int8_t bits, uint8_t token, uint16_t delay)
Schedules playback of a SonicNet token after the next sound starts playing.
Parameters:
bits
token
delay
Return values:
true
(4 or 8) specifies the length of trasmitted token
is the index of the SonicNet token to play (0-255 for 8-bit tokens or 0-15
for 4-bit tokens)
(1-28090) is the time in milliseconds at which to send the token, since
the beginning of the next sound playback
if the operation is successful
Note:
The scheduled token remains valid for one operation only, so you have to call playSound() or
playSoundAsync() immediately after this function.
void playSoundAsync (int16_t index, int8_t volume)
Starts playback of a sound from the sound table. Manually check for completion with hasFinished().
Parameters:
index
volume
is the index of the target sound in the sound table
(0-31) may be one of the values in SoundVolume
Note:
The module is busy until playback completes and it cannot accept other commands. You can
interrupt playback with stop().
bool playSound (int16_t index, int8_t volume)
Plays a sound from the sound table and waits for completion
Parameters:
index
volume
is the index of the target sound in the sound table
(0-31) may be one of the values in SoundVolume
Return values:
true
if the operation is successful
Note:
To alter the maximum time for the wait, define the EASYVR_PLAY_TIMEOUT macro before
including the EasyVR library.
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bool dumpSoundTable (char * name, int16_t & count)
Retrieves the name of the sound table and the number of sounds it contains
Parameters:
name
count
Return values:
true
points to an array of at least 32 characters that holds the sound table
label when the function returns
is a variable that holds the number of sounds when the function returns
if the operation is successful
bool playPhoneTone (int8_t tone, uint8_t duration)
Plays a phone tone and waits for completion
Parameters:
tone
duration
Return values:
true
is the index of the tone (0-9 for digits, 10 for '*' key, 11 for '#' key and
12-15 for extra keys 'A' to 'D', -1 for the dial tone)
(1-32) is the tone duration in 40 milliseconds units, or in seconds for the
dial tone
if the operation is successful
bool resetAll ()
Empties internal memory for custom commands and groups.
Return values:
true
if the operation is successful
Note:
It will take about 35 seconds for the whole process to complete and it cannot be interrupted. During
this time the module cannot accept any other command. The sound table and custom grammars
data is not affected.
EasyVRBridge Class Reference
Public Member Functions




bool check ()
bool checkEEPROM ()
void loop (uint8_t a_rx, uint8_t a_tx, uint8_t b_rx, uint8_t b_tx)
void loop (Stream &s)
Detailed Description
An implementation of a software bridge between two series of Rx/Tx pins, that enables routing of the
hardware serial port (connected to the PC) to digital I/O pins used as a software serial port (connected to the
EasyVR).
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Member Function Documentation
bool check ()
Tests if bridge mode has been requested
Return values:
true
if bridge mode should be started
Note:
The EasyVR Commander software can request bridge mode using the Serial port. This method does
not require to reserve EEPROM locations.
bool checkEEPROM ()
Tests if bridge mode has been requested (legacy method)
Return values:
true
if bridge mode should be started
Note:
The first two EEPROM locations (bytes 0-1) are used for discovery and request of bridge mode from
the EasyVR Commander software. Do not use the same locations for other programa data.
void loop (uint8_t a_rx, uint8_t a_tx, uint8_t b_rx, uint8_t b_tx)
Performs bridge mode between port A and B in an endless loop
Parameters:
a_rx
a_tx
b_rx
b_tx
is the Rx pin of port A
is the Tx pin of port A
is the Rx pin of port B
is the Tx pin of port B
Note:
Bridge mode internally connects Rx:A to Tx:B and Rx:B to Tx:A. This is done by reading from a pin
and writing to the other in a fast loop, that runs until the microcontroller is reset.
void loop (Stream & s)
Performs bridge mode between the PC Serial port and the specified port in a continuos loop. It can be
aborted by sending a question mark ('?').
Parameters:
s
is the target serial port
Note:
You can use this alternate loop on boards that don't have a separate USB/Serial adapter, such as
Arduino Leonardo.
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EasyVR Commander
The EasyVR Commander software can be used to easily configure your EasyVR module connected to your
PC through an adapter board, or by using the microcontroller host board with the provided “bridge” program
(available for ROBONOVA controller board, Arduino 2009/UNO, Parallax Basic Stamp).
You can define groups of commands or passwords and generate a basic code template to handle them. It is
required to edit the generated code to implement the application logic, but the template contains all the
functions or subroutines to handle the speech recognition tasks.
Getting Started
5
Connect the adapter board or a microcontroller host board with a running “bridge” program to your PC, and
then check that all devices are properly turned on and start the EasyVR Commander.
Select the serial port to use from the toolbar or the “File” menu, and then go with the “Connect” command.
Figure 1 – Main application window
There are four kinds of commands in the software (see Figure 1 and Figure 4):




Trigger - is a special group where you have the built-in SI trigger word "Robot" and you may add
one user-defined SD trigger word. Trigger words are used to start the recognition process
Group - where you may add user-defined SD commands
Password - a special group for "vocal passwords" (up to five), using Speaker Verification (SV)
technology
Wordset - built-in set of SI commands (for instance in Figure 1 above, the Wordset 1 is selected)
5
On some systems the EasyVR Commander can automatically upload the “bridge” program to the host
board once connected. That applies to Robonova controller board and Parallax Basic Stamp.
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Speech Recognition
The recognition function of the EasyVR works on a single group at a time, so that users need to group
together all the commands that they want to be able to use at the same time.
When EasyVR Commander connects to the module, it reads back all the user-defined commands and
groups, which are stored into the EasyVR module non-volatile memory.
You can add a new command by first selecting the group in which the command needs to be created and
then using the toolbar icons or the “Edit” menu.
A command should be given a label and then it should be trained twice with the user's voice: the user will be
guided throughout this process (see Figure 2) when the "Train Command" action is invoked.
Note: Only Latin characters and digits can be used for labels, as well as the underscore
character.
Figure 2 – Guided training dialog
After clicking on “Phase 1” or “Phase 2” buttons, remember you have to start speaking only when you see
this little window:
If any error happens, command training will be cancelled. Errors may happen when the user’s voice is not
heard correctly, there is too much background noise or when the second word heard is too different from the
first one.
Figure 3 – Alert dialog in case of conflict
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The software will also alert if a command is too similar to an existing one by specifying the index of the
conflicting command in the "Conflict" column. For example, in the following Figure 4 the command
"TEST_CMD_ONE" sounds too similar to "TEST_CMD_ZERO" (i.e. they have been trained with a similar
pronunciation).
Note: TEST_CMD_ZERO and TEST_CMD_ONE are just examples of labels, you should use
label names that reflects the real command that you are going to train.
Figure 4 – Conflicting commands
The current status is displayed in the EasyVR Commander list view where groups that already contain
commands are highlighted in bold.
The selected group of commands can also be tested, by using the icon on the toolbar or the “Tools” menu, to
make sure the trained commands can be recognized successfully.
Note: If you want to re-train a command you need to erase the previous training first.
Note: "Vocal passwords" (Group 16) are much more sensitive to environment noise and
distance from the microphone: be sure to train and to verify the password in similar conditions.
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Recognition Settings
The module comes programmed with some default settings that can affect voice recognition. These
parameters can be altered in those case where the default values do not offer the best performance.
Figure 5 – Interface for changing recognition settings
The first two parameters (“Level” and “Knob”) affect the way recognition results are evaluated and reported,
each one for a different kind of voice recognition algorithm (Speaker Dependent / Verification and Speaker
Independent).
Both these values are used for a sort of acceptance threshold: each word or command recognized is
assigned a score by the algorithm, which is compared to the threshold.
In some situations the algorithm may flag a correct result as an error or a low confidence result. In those
cases you may try to lower the threshold and allow more results to be reported as correct. The drawback is
that even words that were correctly refused before, now might also be accepted.
The vice-versa is also true: you can increase the threshold to avoid some incorrect words to be reported as
good, but then you may also lose a few correct results. So, in the end, you need to find the best compromise.
The last parameter affect the internal microphone pre-amplifier and AGC (Automatic Gain Control) stages
and is an indication of the expected operating distance of the microphone from the speaker’s mouth.
Note: The EasyVR module is optimized for the default distance setting “Arms Length”.
Any other settings may require hardware modifications to the onboard gain resistor.
To change the recognition settings of the currently connected EasyVR device press the “Apply” button. The
window is non-modal, so you can test the effects of your changes while leaving it open.
The “Save” button makes the EasyVR Commander remember your settings and automatically apply them to
every connected device. The module itself does not store any option.
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Phone Tones Generation (DTMF)
The EasyVR module is also capable of generating DTMF sounds. This feature can be tested by using the
“Dial Tones” command in the “Tools” menu.
Figure 6 – Interface for generating phone tones
The tone duration can be specified in increments of 40 ms (milliseconds). The dial tone has a fixed duration
of 3 seconds (its duration can be modified when programming the EasyVR).
Testing SonicNetTM
Another feature available from the “Tools” menu is the “SonicNet”, a wireless communication protocol based
on transmission and detection of special sequences of tones, called “tokens”.
Two kinds of tokens can be selected: a short version, with up to 16 different tokens, and a long version that
provides up to 256 tokens.
Figure 7 – Interface for testing SonicNet features
The EasyVR module can listen for incoming tokens continuously, or for as long as about 28 seconds
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(specified with a granularity of around 27.5 ms). Another parameter for token detection is the rejection level
that specifies the receiver sensitivity: higher rejection means lower sensitivity that is a lower detection rate,
and vice-versa.
When the timeout parameter is set to 0, the module will listen continuously and you can use the “Play” button
to send a token from your PC soundcard and the “Stop” button to stop listening.
Figure 8 - Modified interface during continuous listening
A prompt window will display the current state of token detection:
Tokens may also be transmitted from the module with the “Send” button. An optional delay parameter can be
used to indicate that the token will be mixed with the next sound played from the Soundtable, after the
specified amount of time since the playback begins. In this case the SonicNet dialog will close to let you
choose a sound to play back.
Note: If you want to mix tokens with a compressed audio sample, you must use a compression
TM
scheme with a sample rate of 9.3kHz when building the Soundtable in the QuickSynthesis
tool.
If the delay is 0, the token is sent out immediately. Other values can be specified up to around 28 seconds of
delay (with a granularity of around 27.5 ms).
Finally, you can also export all the tokens of the specified length to some folder on your PC as Wave files
TM
(.WAV format) by using the “Generate…” button. You can then use those files to embed SonicNet tokens
into other software or external sound sources (such as portable players, CDs or DVDs, etc…)
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Figure 9 - Export of 4-bit tokens
More details about this technology can be found in Sensory’s application note 80-0307-B, available at their
website (http://www.sensoryinc.com/support/docs/80-0307-B.pdf).
Using Custom Data
Sound Table
The EasyVR module can play one of the sounds or sentences saved on its internal flash memory. A
predefined “beep” sound is also always available, even when no sounds have been downloaded to the
module.
The custom sounds are organized in a so-called “sound table” that users can prepare and build with the
TM
special QuickSynthesis tool. Please refer to this application’s own manual for details about the creation of
a sound table. Let’s summarize the basic steps here:






Prepare the audio files you want to include in the sound table in WAV format, uncompressed 16-bit
22050Hz mono. To create the sound files you may use a free software like Audacity for example
(http://audacity.sf.net)
TM
Open Sensory’s QuickSynthesis 5 and create a new project, specifying “RSC4 family”
Add your WAV files and specify one of the supported compression scheme (see table below)
Optionally add sentences, by combining basic WAV sounds. That allows you to save memory when
you have speech audio files, if they share some pieces (like “You said” + “One”, “You said” + “Two”,
and so on)
TM
Build the project with QuickSynthesis and use default settings (“Build linkable module”, “Load in
CONST space”, “Load above or at: 0”). You will be asked to recompress new or modified sound files,
just confirm and proceed
Now save your project and build it once again, so that the EasyVR Commander will see that your
build is up to date.
The audio compression formats supported by the EasyVR module (from highest to lowest compression rate):
Compression Scheme
Available Time (8kHz 15% silence)
Available Time (9.3kHz 15% silence)
SX-2
8.7 minutes
7.5 minutes
SX-3
7.6 minutes
6.6 minutes
SX-4
6.8 minutes
5.9 minutes
SX-5
6.1 minutes
5.2 minutes
SX-6
5.6 minutes
4.8 minutes
4-bit ADPCM
87 seconds
N/A
8-bit PCM
45 seconds
38 seconds
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For audio file containing speech, the SX-3 compression is usually a good choice. If you need higher quality
try lower compression rates. Please note that due to the sampling rate used, the audio files cannot contain
very high frequencies (less than half the sampling rate).
Figure 10 - External tool for creating a Soundtable
Note: Only one Soundtable can be downloaded to the EasyVR module, so make sure you
include all the sounds you want to use in a single project.
Speaker Independent Custom Vocabularies
The set of built-in Speaker Independent recognition vocabularies can be expanded with custom grammars,
TM
that you can create with the QuickT2SI tool (a separate license is required to use the software).
TM
When you create a QuickT2SI project, you are presented with a list of words or short phrases (also called
“commands”) and an optional trigger word/phrase. The so-called “trigger” is a special set that contains only
one word or phrase, with an improved recognition performance, that is used as an entry point for any vocal
interaction with a device that is continuously listening to the user’s voice.
If you need to use a trigger word, it is important to carefully choose it so that it has good performance, with
very few unintended activations and a high recognition rate. When the user says the trigger word followed by
a command, the system can discard unintended activations when the trigger is not followed by a command
within a short amount of time (usually around 3 seconds). Moreover, there is only one trigger word to listen
to, instead of a list of several commands, so the chance to pick up a random command from background
noise or talk is also lower, when using a trigger word.
For assistance on using the QuickT2SI™ Software, please refer to the software help file.
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Figure 61 - External tool for custom vocabularies
Several projects can also be combined together if they are using the same acoustic model (language data)
using the Acoustic Model Combiner included with the tool. This is useful if you have many command
vocabularies, in order to save space in the EasyVR memory.
Updating Custom Data
Once the sound table and/or custom recognition grammars have been created, they can be processed by
the EasyVR Commander and downloaded to the module. Note that you must first disconnect from the
module and do the steps required to start it in “boot-mode” (see the section Flash Update).
Now the command “Update Custom Data” is enabled, either on the toolbar or the “File” menu, and it can be
TM
TM
used to start the update process. First you are required to list all the QuickSynthesis and QuickT2SI
projects you want to use. A new file containing the specified custom data will be generated and the contents
will be displayed, so that you can verify them before updating the module.
TM
TM
Note: The projects must have been built already with the QuickSynthesis or the QuickT2SI
tool, before the custom data generation can be completed successfully. If a recent build is not
available you will receive a warning message, the project files can be opened in their respective
tools and a fresh build started (make sure the project file has been saved before the build).
Once back in the EasyVR Commander the project can be reloaded by pressing the “Refresh” button. If the
process completes successfully, the “Download” button will be enabled and the flash update process can
start.
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Figure 72 – Interface to build and download custom data
The download process will connect at a higher speed to the EasyVR module, so the “bridge” program
running on your host device might not work (in particular Robonova and Basic Stamp cannot be used for this
purpose) and you might need a true “serial adapter”.
The full speed used is 230400 bps, but the option “Slow transfer” can be used to reduce it to 115200, for
6
better compatibility with slower serial adapters . One adapter that can go to full speed is the EasyVR
DevBoard or the SmartVR DevBoard. Otherwise any USB/Serial adapter with TTL/CMOS interface can be
used for updating the flash. The EasyVR Shield can be used for the download, provided that the jumper
(J12) is in UP position.
Note: Every download will overwrite the previously transferred custom data.
After the download completes, a new connection can be established with the EasyVR module (in “normalmode”) and the new sounds will be displayed by the EasyVR Commander, in the special group “SoundTable”
(the last one in the list with a yellow icon). They can be played back and tested using the “Play Sound”
command on the toolbar or in the “Tools” menu. See also how to do that in your application in the code
example Use custom sound playback.
Custom grammars will be displayed just after the built-in word sets and they work exactly the same way.
Trigger words, when specified, will have their own vocabulary with only one entry. You can test and use the
custom trigger and command grammars as you do with the built-in ones.
Note: The built-in trigger word set is handled in a special way, as it is active also when
recognizing from the first user defined command group. This is the only case where SD and SI
commands are mixed together and does not apply to custom trigger vocabularies.
6
Arduino UNO (and other boards with USB/Serial adapter based on ATMEGA8U2) need the option “Slow
transfer” enabled
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Updating Firmware
The EasyVR firmware can be updated in a similar way to custom data by using the command “Update
Firmware...” from the “Help” menu. Note that you must first disconnect from the module and do the steps
required to start it in “boot-mode” (see the section Flash Update).
The specified file will be verified as an official firmware release and basic version information will be
displayed. If the firmware passes the verification step, then the “Download” button will be enabled.
Figure 83 - Interface for updating EasyVR firmware
Note: After a new firmware is downloaded to the module, the custom data already present is
erased and it must be downloaded again if necessary.
Troubleshooting
Downloading custom data or update fails
1. Double check your settings (COM Port selection; Jumper position)
2. Try to enable the option “Slow transfer”
3. Use an USB to TTL adapter connected directly to the EasyVR module
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How to get support
Please feel free to contact us with any questions, queries or suggestions.
If your question is about technical support or troubleshooting for one of our products, we kindly ask you to
first check our FAQ for a possible solution: http://www.veear.eu/faq
If you cannot find an existing solution on the FAQ, please contact us using the contact form on our website at
http://www.veear.eu/support. The more detail you provide, the better support we can give.
VeeaR © RoboTech srl, all rights reserved.
All VeeaR branded boards and software are manufactured by RoboTech srl
RoboTech srl assumes no responsibility for any errors, which may appear in this manual. Furthermore, RoboTech srl
reserves the right to alter the hardware, software, and/or specifications detailed herein at any time without notice, and
does not make any commitment to update the information contained herein. RoboTech srl products are not authorized
for use as critical components in life support devices or systems.
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