ASI8921/ASI8821

ASI8921/ASI8821
16 July 2010
ASI8921/ASI8821
PCI/PCI EXPRESS MULTI CHANNEL TUNER ADAPTERS
1 DESCRIPTION
3 FEATURES
• Up to 8 channels of AM/FM audio capture
The ASI8921/ASI8821 series are professional PCI tuner
adapters designed for use in AM/FM/RBDS/RDS radio
broadcast audio monitoring and auditing.
• PCI interface (ASI8921) or PCIe interface
(ASI8821)
The ASI8921 and ASI8821 are based on tuner
modules. Each module has four tuners on it and the
ASI8921/ASI8821 can hold a maximum of two modules.
The ASI8921 is a PCI adapter and the ASI8821 is a PCI
Express (PCIe) adapter.
• Up to 8 channels of FM RBDS/RDS data capture
• AM/FM/RBDS/RDS tuners can be fed from
individual external antennae
• Audio monitoring of all tuners simultaneously
Up to eight different channels of AM or FM can be
received and recorded simultaneously from a single
antenna input. Recording formats include PCM and
MPEG-1 layer2 and MPEG-1 Layer 3 (MP3).
• MRX technology allows each stream to have an
independent sample rate of between 8 and 48kHz
2 ORDERING INFORMATION
• PCM and MPEG-1 Layer 2 and MP3 recording
formats
ASI8921-1000
ASI8821-1000
4 channels of AM/FM/RBDS/RDS
• Half-length PCI card
ASI8921-1100
ASI8821-1100
8 channels of AM/FM/RBDS/RDS
• Up to 8 cards in one system
ASI8921-2000
ASI8821-2000
4 channels of AM/FM/RBDS/RDS
+ MCX external antenna jacks
• Windows XP/Server 2003/7 and Linux software
drivers available
ASI8921-2200
ASI8821-2200
8 channels of AM/FM/RBDS/RDS
+ MCX external antenna jacks
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4 REVISIONS
Date
02 April 2008
23 January 2009
21 June 2010
16 July 2010
www.audioscience.com
Description
Released.
Formatting updates.
Added ASI8821 (PCI Express version).
First page: Added ASI8821 image and updated ASI8921 image.
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5 SPECIFICATIONS
RF INPUT
Connector
F type 75 ohms, on card bracket
MCX connector (optional) (AM/FM only, per tuner, jumper selectable)
FM/RDS TUNER (-1000, -1100, -2000,
-2200)
FM
Modes
Frequency range
Sensitivity
Input Level
THD+N
De-emphasis
Audio bandwidth
Mono or Stereo
75.9MHz - 108.1MHz, 50kHz channel spacing
15dBuV for 30dB THD+N
90 dBuV Maximum (F connector)
100 dBuV Maximum (External antenna connector)
55dB @ 60dBuV RF Level, 1kHz sinewave, mono, 75kHz deviation, A-weighting
50us or 75us (software selectable)
30Hz-15kHz (+/-3dB)
RDS/RDBS
Sensitivity
25 dBuV
AM TUNER (-2000, -2200)
AM
Frequency range
Sensitivity
Input Level
De-emphasis
Audio bandwidth
520kHz-1720kHz, 1kHz channel spacing
30dBuV for 30dB S/N
F connector:
75 dBuV Maximum
External antenna MCX
90dBuV Maximum
connector:
50dB @ 60dBuV RF Level, 1kHz sinewave, 75% modulation, A-weighting, 2kHz
bandwidth
None or 50us (software selectable)
100Hz - 2kHz (+/-3dB)
LINE OUTPUT
Connector
Breakout Cable (included)
Audio
Video
Mini 50pin on card bracket
CBL3004 – Mini 50pin to 24 RCA jacks
4Vpp max into 10Kohms
CVBS, 1Vpp into 75ohms
THD+N
SIGNAL PROCESSING
DSP
Memory
Sample rates
Audio Formats
Texas Instruments TMS320C6713@300MHz
8MB
8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48kHz
8 bit unsigned PCM,
16bit signed PCM,
24 bit signed PCM
32bit IEEE floating point PCM
MPEG-1 Layer 2, MPEG-1 Layer 3 (MP3)
(MPEG Layer-3 audio coding technology licensed from Fraunhofer IIS and THOMSON
multimedia)
GENERAL
Bus
Dimensions
Weight
Operating Temperature
Power Requirements
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ASI8921 – Universal 32bit PCI (3.3V or 5V signaling)
ASI8821 – X1 PCI Express
PCI short-length form factor (6.6 inches/168mm long)
7oz (200g) max
0°C to 70°C
3.3V @ 1.3A, +5V @ 0.8A, -12V @0.1A
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6 CONTENTS
1
DESCRIPTION ................................................................................................................................................. 1
2
ORDERING INFORMATION ............................................................................................................................ 1
3
FEATURES....................................................................................................................................................... 1
4
REVISIONS....................................................................................................................................................... 2
5
SPECIFICATIONS............................................................................................................................................ 3
6
CONTENTS ...................................................................................................................................................... 4
7
BLOCK DIAGRAMS......................................................................................................................................... 6
8
CONNECTORS ................................................................................................................................................ 7
8.1
8.2
9
HARDWARE INSTALLATION ......................................................................................................................... 8
9.1
9.2
10
F-TYPE ......................................................................................................................................................................7
HD50 ........................................................................................................................................................................7
SETTING ADAPTER INDEX – ONE ADAPTER IN THE PC..............................................................................................8
SETTING ADAPTER INDEX - TWO OR MORE ADAPTERS IN THE PC ............................................................................8
SOFTWARE INSTALLATION .......................................................................................................................... 9
10.1
DRIVERS FOR WINDOWS XP/SERVER 2003/SERVER 2008/7......................................................................................9
10.1.1
WAVE Driver ..................................................................................................................................................9
10.1.2
WDM Driver ...................................................................................................................................................9
10.1.3
Combo Driver .................................................................................................................................................9
10.1.4
ASIO................................................................................................................................................................9
10.1.5
Driver Failure .................................................................................................................................................9
10.2
DRIVERS FOR LINUX ................................................................................................................................................10
10.3
APPLICATIONS FOR WINDOWS .................................................................................................................................10
10.3.1
ASIControl ....................................................................................................................................................10
10.3.2
ASIMixer .......................................................................................................................................................10
11
OPERATION USING ASICONTROL ............................................................................................................. 11
11.1
USER INTERFACE .....................................................................................................................................................11
11.1.1
Adapter List Window.....................................................................................................................................11
11.1.2
Adapter Topology Window............................................................................................................................11
11.1.3
Node Controls Window .................................................................................................................................12
11.2
CONTROLS ...............................................................................................................................................................12
11.3
ADAPTER INFORMATION..........................................................................................................................................12
11.3.1
Interface ........................................................................................................................................................12
11.3.2
Tuner .............................................................................................................................................................13
11.4
VOLUME ..................................................................................................................................................................15
11.4.1
Interface ........................................................................................................................................................15
11.4.2
Developer ......................................................................................................................................................16
11.5
METER.....................................................................................................................................................................16
11.5.1
Interface ........................................................................................................................................................16
11.5.2
Developer ......................................................................................................................................................16
11.6
RECORDER...............................................................................................................................................................17
11.6.1
Interface ........................................................................................................................................................17
11.6.2
How To Record a File ...................................................................................................................................17
11.6.3
Developer ......................................................................................................................................................17
12
AUDIO FORMATS.......................................................................................................................................... 18
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13
ANTENNAS .................................................................................................................................................... 19
13.1
13.2
14
ERRATA ......................................................................................................................................................... 21
14.1
15
ANTENNAS ..............................................................................................................................................................19
PER-TUNER EXTERNAL ANTENNAS .........................................................................................................................20
REV D0....................................................................................................................................................................21
REFERENCES ............................................................................................................................................... 21
15.1
15.2
RDS ........................................................................................................................................................................21
SPECIFICATIONS ......................................................................................................................................................21
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7 BLOCK DIAGRAMS
ASI8921/ASI8821 - 8 x AM/FM/RDS
ASI1721 Module
PCI Bus
Meter
Record Stream 1
PCM/MP2/MP3
24 bit
A/D
RDS Stream 1
24 bit
A/D
Record Stream 2
PCM/MP2/MP3
RDS Stream 2
Record Stream 3
PCM/MP2/MP3
24 bit
A/D
RDS Stream 3
24 bit
A/D
Record Stream 4
PCM/MP2/MP3
RDS Stream 4
AM/FM/RDS
Tuner 1
RF input
Splitter
AM/FM/RDS
Tuner 2
AM/FM/RDS
Tuner 3
AM/FM/RDS
Tuner 4
Meter
Record Stream 5
PCM/MP2/MP3
24 bit
A/D
RDS Stream 5
Record Stream 6
PCM/MP2/MP3
24 bit
A/D
RDS Stream 6
Record Stream 7
PCM/MP2/MP3
24 bit
A/D
RDS Stream 7
Record Stream 8
PCM/MP2/MP3
RDS Stream 8
24 bit
A/D
AM/FM/RDS
Tuner 5
AM/FM/RDS
Tuner 6
AM/FM/RDS
Tuner 7
AM/FM/RDS
Tuner 8
50pin D
Audio output 1...8
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8 CONNECTORS
8.1
F-Type
The F connector feeds the RF signal from an external antenna to all tuners on the ASI8921/ASI8821.
8.2
HD50
The HD50 connector makes available the mono or stereo audio of each tuner output. Ch1 is sourced from a
software-controlled mux and may be programmed to output Ch1...8. The output level is 2Vpp into 10Kohms.
Breakout cable CBL3004 is supplied with the ASI8921/ASI8821. This supplies the 8 stereo audio outputs and 8
CVBS video outputs, all on RCA (phono) jacks.
CBL3004
3
6
2
1
2
3
4
Not used
5
1
6
7
8
1
4
2
3
4
Right audio outputs 1..8
5
6
7
8
1
5
2
3
4
Left audio outputs 1..8
5
6
7
8
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9 HARDWARE INSTALLATION
This section explains how to install one or more AudioScience adapters in a computer.
9.1
Setting Adapter Index – One Adapter in the PC
1. Make sure your computer is turned off.
2. PCI adapters should be installed in any empty PCI slot and PCIe adapters should be installed in any x1 (or
greater) PCIe slot.
3. Make sure the adapter jumper is set to adapter index #1, the factory default. For a new card no changes need
to be made. For an AudioScience adapter from another installation, check that it is set to adapter index #1.
Depending on the adapter family, there are different ways of setting the adapter index.
For ASI5000 and ASI6000 families, there is
an adapter jumper that must be set. The left
most position represents adapter index #1.
Adapter Jumper
set to Adapter #1
For ASI5300, ASI6300, ASI8700, and
ASI8900 families, there is a rotary switch.
NOTE: Position 0 (zero) represents adapter
#1, position 1 is adapter #2, etc.
Adapter Index switch
set to Adapter #1
4. Turn on the computer and let it boot. Under Windows, a dialog box will pop up informing you that the computer
has detected a new Multimedia Audio card. Cancel out of this dialog box and proceed to the software installation
section of this datasheet.
9.2
Setting Adapter Index - Two or More Adapters in the PC
1. Make sure your computer is turned off.
2. PCI adapters should be installed in any empty PCI slots and PCIe adapters should be installed in any x1 (or
greater) PCIe slots. Different adapter types can coexist in the same computer; for example, an ASI6416 and
ASI8921 will work correctly if installed in the same PC. Different adapter types still require unique adapter index
numbers.
3. Each adapter in the PC needs to have its adapter jumper/rotary switch position set to unique numbers. For
example if you are installing two adapters, the first one would be set to adapter index #1 and the second to
adapter index #2.
For ASI5000 and ASI6000 families, the position to the right of index #1, when jumpered, represents adapter index
#2. The next position represents #3, and the rightmost position, when jumpered, represents #4.
For ASI5300, ASI6300, ASI8700, and ASI8900 families, rotate the rotary switch to indicate what position is
required.
4. Turn on the computer and let it boot. Under Windows, a dialog box will pop up informing you that the computer
has detected a new Multimedia Audio card. Cancel out of this dialog box and proceed to the software installation
section of this datasheet.
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10 SOFTWARE INSTALLATION
AudioScience makes audio adapters and drivers for various operating systems. Enhancements to an adapter’s
utility come from the integrators software that uses the audio driver to implement sophisticated audio playback
and recording functions.
10.1 Drivers for Windows XP/Server 2003/Server 2008/7
The first step is what type of driver is needed for the adapter. There are two types of drivers for Windows: The
WAVE driver and the WDM driver. Typically this will be decided by the application used with the AudioScience
adapter. For any application that uses DirectSound, use the WDM driver.
Driver 3.10 and later present the user with three install options during installation:
Install Standard PCI/PCIe Driver.
Install Standard + Network Audio Driver.
Remove all driver components
Traditional installs should select the first of these options. Users of AudioScience CobraNet products should
select the second option with the “+Network Audio Driver.” in the text.
10.1.1 WAVE Driver
Download the file named ASIWAVE_xxxxxx.EXE from www.audioscience.com and run it (_xxxxxx is the version
number). After the EXE has run, reboot the computer and the audio adapter will be operational. If the cover is off
the computer, one can see one or two blinking LEDs on top of the card indicating its DSP is running and
communicating with the driver.
Verify that the adapter is running using ASIControl (see ASIControl section in this document).
10.1.2 WDM Driver
Download the file named ASIWDM_xxxxxx.EXE from www.audioscience.com and run it (_xxxxxx is the version
number). After the EXE has run, reboot the computer and the audio adapter will be operational. If the cover is off
the computer, one can see one or two blinking LEDs on top of the card indicating its DSP is running and
communicating with the driver.
Verify that the adapter is running using ASIControl (see ASIControl section in this document).
10.1.3 Combo Driver
The Combo driver presents both Wave and WDM devices to the user. Download the file named
ASICOMBOV_xxxxxx.EXE from www.audioscience.com and run it (_xxxxxx is the version number). After the EXE
has run, reboot your computer and the audio adapter will be operational. If the cover is off the computer, one can
see one or two blinking LEDs on top of the card indicating its DSP is running and communicating with the driver.
Verify that the adapter is running using ASIControl (see ASIControl section in this document).
10.1.4 ASIO
All AudioScience drivers also install an ASIO driver interface. It is installed by default.
10.1.5 Driver Failure
In the event that an adapter’s driver fails to load correctly, the OS’s event viewer should be checked. The event
log is viewed as follows:
XP: The system event log is accessed from \Start\Control Panel\Administrative Tools\Event Viewer. The System
view should be selected.
7: The system event log is accessed from \Start\Control Panel\System and Maintenance\Administrative
Tools\Event Viewer. The Windows Logs\System view should be selected.
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If two or more adapters are installed in the same system, the first thing to check is that the adapters were
assigned unique adapter numbers. If issues persist, please email support@audioscience.com.
10.2 Drivers for Linux
The latest Linux driver can be downloaded from the AudioScience website – www.audioscience.com
10.3 Applications for Windows
AudioScience provides two application for adapter set-up and configuration: ASIControl and ASIMixer.
10.3.1 ASIControl
All Windows drivers install an AudioScience application called ASIControl that can be used to setup and verify
functionality of adapters. ASIControl provides a common interface for users across all driver types.
The following list of controls are uniquely supported in ASIControl (as opposed to ASIMixer):
- ASI8700 tuner pre-emphasis
- ASI8900 tuner RBDS
- ASI8900 tuner FM stereo indication
- ASI8914 HD Radio PSD field
- ASI8914 HD Radio Digital status field
- ASI8914 HD Radio Digital program number selection
From the Windows Start menu, navigate to StartÆProgramsÆAudioScience and run the ASIControl program.
When started, ASIControl will look something like the following:
10.3.2 ASIMixer
ASIMixer is specific to the Wave and Combo drivers and is available from the AudioScience website. It uses the
Wave/Mixer interface to control AudioScience adapters. Users of driver version 3.10 and later are encouraged to
use ASIControl for manipulating adapter controls.
See the list of controls in the previous section that that are only available in ASIControl.
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11 OPERATION USING ASICONTROL
Using ASIControl, the ASI8921-2200 will look like so:
Adapter
List
Window
Adapter
Topology
Window
Node
Controls
Window
11.1 User Interface
ASIControl consists of three main windows: the adapter list in the top portion of the window, the adapter topology
view on the left hand side, and the node control list on the right hand side.
11.1.1 Adapter List Window
The top portion of ASIControl shows a list of all the adapters that the application has found. By default, only bus
based (i.e. PCI and/or PCI Express) adapters will be shown. If the network portion of the driver is installed (by
selecting “Install Standard + Networked Audio Driver” after running the driver installer) and “Local PCI(e) +
Networked adapters” is selected from ASIControl’s OptionsÆConfigure adapter interface, then AudioScience and
other third party CobraNet devices will be shown.
Adapters are listed in order of adapter index. For bus-based adapters, this is determined by the adapter index
jumper on the card. For AudioScience CobraNet devices this is calculated from the unit’s MAC address. Third
party CobraNet devices are listed last as they have no AudioScience index.
11.1.2 Adapter Topology Window
The left hand side of ASIControl contains the topology view of the adapter. It is essentially a block diagram of the
device showing the available physical inputs and outputs on the right hand side. On the left hand side, bus based
adapters show player and recorder streams, while CobraNet adapters show their network connections.
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Each of these inputs and outputs is referred to as a Node and each Node contains one or more Controls on it.
The topology shows each Control as a small square icon. A non-exhaustive list of nodes follows:
Line In
Recorder
Line Out
Tuner
AES/EBU In
Clock Source In
AES/EBU Out
CobraNet In
Player
CobraNet Out
Hovering the mouse over a particular node will highlight it. Clicking on a node will bring up the controls resident
on that node in the right hand control list.
There is an adapter node in the top left corner of the topology window. Clicking on this will show adapter-specific
controls and properties on the right hand side.
11.1.3 Node Controls Window
The right hand side of ASIControl shows the controls associated with the selected node in the topology view. The
controls are arranged, from top to bottom, in order of audio signal flow, i.e. the audio signal can be viewed as
entering the node at the top control and leaving at the bottom control.
11.2 Controls
For further information on controls common to all AudioScience adapters and how to operate ASIControl, please
see the ASIControl manual, available from www.audioscience.com and also installed by the driver.
Below is a list of controls in ASIControl specific to this adapter.
11.2.1 Adapter Information
This control displays information about the installed adapter or ASI2416.
11.2.1.1 Interface
Figure 1. Adapter information seen in right side of ASIControl.
Serial Number:
The serial number is displayed here.
Hardware Revision:
This lists the hardware revision.
DSP Software Version:
The DSP software version is displayed; usually the same as the driver version installed.
DSP Utilization:
This shows the loading of the adapter’s DSP in percent.
Note: Utilization should be kept below 90%.
Note: Utilization should be kept below 90%.
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11.2.2 Tuner
The Tuner control is used to tune radio or TV channels on the ASI8700 and ASI8900 series tuner adapters.
There are six sections to the tuner control: Generic, Analog Radio, PSD/RBDS, Analog TV, Tuner volume, and
Meter. See below for a review on each section.
Note: Not all tuner adapters support all six sections.
11.2.2.1 Generic
Figure 2. Generic section of Tuner controls.
Band:
Selects which type of demodulation the tuner will perform. Depending on the adapter type, the following Bands
may be available:
Band
AM
FM Mono
FM Stereo
TV NTSC
TV PAL-B/G
TV PAL-I
TV PAL-D/K
TV SECAM-L
Aux
Description
Mono AM radio
Mono FM radio
Stereo FM radio
Analog NTSC TV
Analog PAL-B/G TV
Analog PAL-I TV
Analog PAL-D/K TV
Analog SECAM-L TV
Auxiliary input on ASI87XX (50pin header)
Supported adapters
ASI87XX, ASI8921/8821
ASI87XX, ASI8921/8821
ASI87XX, ASI8921/8821
ASI8723
ASI8733
ASI8733
ASI8733
ASI8733
ASI87XX
Frequency:
Sets the frequency of the channel to be tuned. It is specified in kilohertz (kHz). For example, an FM radio
frequency of 88.1MHz is specified as 88100 and NTSC-TV Ch2 is specified as 55250.
Attenuation:
Allows a 0db or 20dB attenuation of the incoming RF signal.
Supported adapters: ASI87XX series
RF Level:
Shows the RF signal strength of the incoming RF signal in dBuV.
Supported adapters: ASI87XX series, ASI8921/8821
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11.2.2.2 Analog Radio
Figure 3. Analog Radio section of Tuner controls for ASI87XX and ASI8921/8821.
If an analog AM/FM tuner is present on the adapter then the following items are available.
Supported adapters: ASI87XX, ASI8921/8821
FM Stereo:
For analog FM, shows whether the signal is being received as stereo.
De-emphasis:
Sets the de-emphasis for analog radio. Available choices are:
AM: none, 50us
FM: 50 or 75us
11.2.2.3 RBDS
This control shows metadata that is contained in an analog FM broadcast. (The PSD information is for HD Radio
broadcast metadata available on the ASI8914.)
Supported adapters: ASI8921/8821
11.2.2.3.1 RBDS - Analog FM
Figure 4. FM RBDS information as seen in ASIControl.
When an analog FM signal is being received that has RDS (Europe) or RBDS (United States) data, the following
fields are available:
Station:
Not an RBDS field (a PSD field)
PI:
Short for Program Identification. A unique code that identifies the station. 5B2D is shown above.
PTY:
Short for Program Type. A code representing up to 31 different radio program types. RDS and RBDS definitions
are different. In the above example the PTY code is 06, which represents in RBDS coding, Classic Rock type.
PS:
Short for Program Service. It is an eight-character string that represents the call letters or station identity. In this
example WCMF is shown.
RT:
Short for Radio Text. This is a string up to 64 characters long. In the example shown, the current artist (ERIC
CLAPTON) and song (I CAN’T STAND IT), as well as frequency (96.5) are shown.
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11.2.2.4 Analog TV
Figure 5. Analog TV section of Tuner controls.
If an analog TV tuner is present on the adapter then the following items are available.
Supported adapters: ASI8723, ASI8733
Video Present:
Shows whether video is present in the TV signal being received.
Color Present:
Shows whether color information is present in the TV signal being received.
Vsync is 60Hz:
Shows whether the vertical sync is 60Hz. This will be YES for NTSC and NO for PAL signals.
Hsync Present:
Shows whether the horizontal sync is present.
11.2.3 Volume
The Volume control allows the audio signal’s gain to be altered in the range of –100 to +20dB.
11.2.3.1 Interface
Figure 6. A Volume of a Player in ASIControl.
Left and Right display boxes:
Displays the gain settings that the slider bars are set to.
Slider Bars:
Click on the bar with the mouse and drag to desired gain. Once the bars are selected, the left and right arrow
keys can also be used to change the settings.
Lock:
When checked, locks the left and right channels to the same gain value. When unchecked, allows the left and
right channels to have independent gains. (Note that if an adapter is in SSX2 mode, the Player volumes cannot
be unlocked to move the left and right channels independently.)
Autofade:
When pressed, automatically fades the volume to the opposite end of the scale.
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11.2.3.2 Developer
11.2.3.2.1 Windows APIs
Wave/Mixer – MIXERCONTROL_CONTROLTYPE_VOLUME
This is a Windows standard volume control. Settings are in the range of 0 to 65535, where 0 completely mutes
the output and 65535 is the maximum volume.
HPI – HPI_Volume APIs.
ASX – ASX_Volume APIs.
DirectSound – TBD.
11.2.3.2.2 Linux APIs
HPI –HPI_Volume APIs.
ASX –ASX_Volume APIs.
ALSA – TBD.
11.2.4 Meter
Meters in ASIControl are located on audio nodes and display the audio level as the audio signal passes through
the node. Most AudioScience devices return both RMS and peak level readings and ASIControl displays both
simultaneously.
11.2.4.1 Interface
Figure 7. A stereo peak meter display. The RMS is the green bar and the peak is the yellow bar.
To the right of the peak meter is the absolute readings in dBFS. These can be useful when testing input tones of a
specific known level.
11.2.4.2 Developer
11.2.4.2.1 Windows APIs
Wave/Mixer – Meters are read using mixerGetControlDetails() on a control of type signed and with type “Peak”
the name “Peak Meter”. A minimum value is 0 and maximum is 32767. The interface returns the peak readings
only, not the RSM level. It confirms to expected Windows functionality.
HPI – Meters are read using the HPI_Meterxxx() API.
ASX – Meters are read using the ASX_Meter_xxx() API.
DirectSound – TBD.
11.2.4.2.2 Linux APIs
HPI – Meters are read using the HPI_Meterxxx() API.
ASX – Meters are read using the ASX_Meter_xxx() API.
ALSA – TBD.
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11.2.5 Recorder
The Recorder control supports recording of an audio file.
11.2.5.1 Interface
Figure 8. A recorder in ASIControl.
The first line of text contains the name given to the recorded file along with the location where it is to be saved.
Below the filename is the file information, the record time and record bytes, the recorder control buttons and the
file Append option.
11.2.5.2 How To Record a File
The first step in recording a file is to have audio coming into the adapter. This can be from a line-in or from one of
the players in ASIControl. See appropriate sections in this datasheet to accomplish this. Next, the new file needs
a name and place to be saved, or an existing audio file can be selected to be overwritten or appended to. Use the
file icon button to navigate to the location to create the file and to give it a name, or to open a previously
recorded file to overwrite or append to it. Next, from the dropdown arrows, select the number of “Channels”, the
“Sample Rate”, the “Format”, and the “Bitrate” that the file should be recorded in.
Check the Append checkbox to save the audio to the end of an already existing file.
The file is now ready to be recorded. To start recording, press the record button. At this point the “Time’ and
“Bytes’ fields report record time and the number of bytes of the file that have been recorded.
Once recording has started, the stop and pause buttons can be used to stop or pause the playback.
11.2.5.3 Developer
11.2.5.3.1 Windows APIs
Wave – use waveInOpen(), waveInStart() etc.
HPI – use HPI_InStreamxxx() functions.
ASX – use ASX_Recorder_xxx() functions.
DirectSound – TBD.
11.2.5.3.2 Linux APIs
HPI – use HPI_InStreamxxx() functions.
ASX – use ASX_Recorder_xxx() functions.
ALSA – TBD
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ASI8921/ASI8821
12 AUDIO FORMATS
The ASI8921/ASI8821 supports the following audio recording formats:
Format
HPI format
Windows format
8 bit unsigned PCM
16 bit signed PCM
32 bit floating point PCM (+/-1.0)
HPI_FORMAT_PCM8_UNSIGNED
HPI_FORMAT_PCM16_SIGNED
HPI_FORMAT_PCM32_FLOAT
MPEG-1 Layer 2
HPI_FORMAT_MPEG_L2
MPEG-1 Layer 3 (MP3)
HPI_FORMAT_MPEG_L3
WAVE_FORMAT_PCM, wBitsPerSample=8
WAVE_FORMAT_PCM, wBitsPerSample=16
WAVE_FORMAT_IEEE_FLOAT
WAVE_FORMAT_MPEG
-fwHeadLayer=ACM_MPEG_LAYER2
-fwHeadMode=ACM_MPEG_SINGLECHANNEL,
ACM_MPEG_DUALCHANNEL,
ACM_MPEG_STEREO
WAVE_FORMAT_MPEG
- fwHeadLayer=ACM_MPEG_LAYER3
-fwHeadMode=ACM_MPEG_SINGLECHANNEL,
ACM_MPEG_DUALCHANNEL,
ACM_MPEG_STEREO
OR
WAVE_FORMAT_MPEGLAYER3
Not all combinations of channels, samplerates and bitrates are allowed for MP3. The following table shows the
supported variations, assuming all eight recording streams are being used:
Sample Rate (kHz)
Channels
Bitrates (kbs)
8, 11.025, 12
16, 22.05, 24
32
Mono/Stereo
Mono/Stereo
Mono only
16,32,40,48,56
16,32,40,48,56,64,96,112,128
32,40,48,56,64,80,96,112,128
NOTE – for maximum efficiency, you must use one sample rate for all streams and set the global sample rate of
the ASI8921/ASI8821 to this rate.
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ASI8921/ASI8821
13 ANTENNAS
13.1 Antennas
AudioScience has tested and can recommend the following antenna configuration for use with the ASI8700 and
ASI8900 series adapters.
The configuration is made up of an omni-directional FM whip antenna, plus multiple ferrite stick antennas, each
oriented and tuned to pick up a particular AM station. The antenna’s signals are mixed using a common 75-ohm
cable TV splitter, which we have found has the necessary low end bandwidth to pass AM signals.
The FM antenna is made by Fanfare (http://www.fanfarefm.com) and is part number FM-2G. Besides FM
stations, this antenna will also pickup strong AM stations.
The AM antenna is made by C.Crane (http://www.ccrane.com) and is part number TCA. This antenna has a
tuning control that allows you to tune into a particular station using a dial on the front of the control.
The following diagram shows how three AM and the one FM antennas would be wired.
FM antenna
AM antenna #1
AM tuner
control
AM antenna #2
AM tuner
control
AM antenna #3
AM tuner
control
1:4 cable TV
splitter
To tuner adapter
Figure 9. Four antennas, three AM and one FM, wired together.
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ASI8921/ASI8821
13.2 Per-Tuner External Antennas
The ASI8921/8821 allows each tuner to be connected to an individual external antenna rather than being fed from
the F connector on the bracket. This is accomplished by jumpering the appropriate tuner to use the MCX jack as
an RF signal input. MCX jacks are only available on ASI8921/8821-2000 and –2200 models.
The picture below shows the jumper positions for the external antenna for one of the two modules. The second
module is the same
MCX connector
Jumper in position for external antenna
Jumper in position for internal feed from F connector
NOTE: There is no amplification of the RF signal when using the antenna via the MCX jack so the received signal
strength (RF level) may be lower than when using the internal signal feed from the F connector.
AudioScience has available a cable (Part # CBL3001) that connects to the MCX jack and provides an F connector
on the other end.
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ASI8921/ASI8821
14 ERRATA
This section lists known issues for specific hardware revisions.
14.1 Rev D0
Tuner 5 through 8: Right channels are not present on the mini DB-50 connector
15 REFERENCES
15.1 RDS
Wright, Scott, 1997, ”The broadcaster’s guide to RDS”, ISBN 0-240-80278-0
15.2 Specifications
SPCHPI.PDF - Hardware Programming Interface (HPI) Specification
SPCWAVX.PDF - WavX - AudioScience Windows Multimedia Extensions
These documents are available from www.audioscience.com in the Technical Info section.
<end>
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