product and applications bulletin

product and applications bulletin
PRODUCT AND APPLICATIONS BULLETIN
FILE:
Section 4 [Applications]
PRODUCTS:
Nexia® VC – Videoconference DSP
Nexia® SP – Speaker Processing DSP
daVinci ™ – Control Software
APPLICATION:
Training / Observation Rooms with monitoring and intercom system.
REQUIREMENTS:
• Instructional area with selectable monitoring of training rooms
• Two-way communication between instructional area and selected rooms
• Recording and playback of training sessions, plus background music
PRODUCT OVERVIEW:
Nexia VC is a digital signal processor with 8 wide-band acoustic echo canceling (AEC) mic/line inputs,
2 standard mic/line inputs, 4 mic/line outputs, and a codec interface. Nexia SP is a digital signal
processor with 4 line inputs and 8 independent mix outputs. Nexia software includes a broad selection
of audio components, routing options, and signal processing. The internal system design is completely
user definable via PC software, and can be controlled via dedicated software screens, RS-232 control
systems, and a variety of optional remote controls. Multi-unit Nexia systems can be created utilizing
Ethernet and NexLink digital audio linking.
daVinci is a free software program, designed to allow the creation and use of customized computer
control screens with Nexia digital audio systems. The function and appearance of the graphic control
interface can be tailored to the exact needs of the user. Individual or grouped sets of controls may be
placed and assigned to specific system functions...or...component objects can be copied directly from the
system design file into daVinci software, producing completely pre-assigned control surfaces. An array
of drawing tools is provided for extensive graphic manipulation of controls, backgrounds, and labeling.
Control screens can be created with the ability to easily navigate between multiple pages of operation.
Once created, a control file is downloaded into the system, where it can then be accessed by multiple
network computers running daVinci software. daVinci cannot alter the system design, and control
access to the system may be password protected. System control may be provided using a combination
of daVinci software, hardware control panels, and third-party RS-232, simultaneously.
Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com
Speaker
Mic
Speaker
Room 1
Mic
Speaker
Room 2
Mic
Speaker
Room 3
Mic
Room 4
hallway
Instructor
Room 5
Speaker
Room 6
Mic
Speaker
Room 7
Mic
daVinci ™
control
screen
Speaker
Mic
Speaker
Nexia
software
setup
®
daVinci ™
touchscreen
control
Ethernet
switch
Mic
Nexia VC
BIAMP SYSTEMS
NexLink Rx
designed and assembled in the USA
www.biamp.com
CAUTION
RISK OF ELECTRICAL SHOCK.
DO NOT OPEN.
Class 2
wiring
US
52SJ
3
2
1
codec
input
mic/line inputs
10
9
AEC inputs
8
7
6
5
4
3
2
1
2
1
~
100-240V
50/60Hz
65 Watts, 1.0 A
term
hi lo
Ethernet
NexLink Tx
24VDC @ 0.5A
to recorder
playback
R
LISTED
codec
output
outputs
4
serial
music
C
UL
Remote
Control Bus
2
1
from room mics
Nexia SP
BIAMP SYSTEMS
®
NexLink Rx
designed and assembled in the USA
www.biamp.com
CAUTION
RISK OF ELECTRICAL SHOCK.
DO NOT OPEN.
Class 2
wiring
C
UL
R
LISTED
52SJ
US
Remote
Control Bus
outputs
8
serial
7
6
5
inputs
4
3
4
3
~
100-240V
50/60Hz
65 Watts, 1.0 A
term
hi lo
Ethernet
NexLink Tx
24VDC @ 0.5A
to room speakers
Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com
APPLICATION EXAMPLE:
This application represents a complete audio monitoring and intercom system for observation/training in
classrooms. Video monitoring and camera selection can be easily incorporated into this same system.
To the left is a diagram of the physical layout, as well as a system diagram. An example design file and
custom control screen can be seen on the back page. This system allows an instructor to select a specific
training room for monitoring. Two-way communication is automatically enabled between the instructor
and the selected training room. The instructor has a touchscreen which provides complete control of the
system, including room monitoring selection and instructor’s microphone activation, as well as source
selection for a training session recorder and routing of selected program material to the rooms.
Nexia VC was chosen for this job because of the acoustic echo cancellation (AEC) on inputs 1~8. This
wide-band AEC allows two-way communication between the instructor and selected training room,
without the annoying echo associated with having both room mics and speakers active simultaneously.
A microphone and speaker are placed in each room, including the instructor’s room. The mics are
connected to the AEC inputs of the Nexia VC. Output 1 of the Nexia VC is feeding a recording system,
intended to document individual training sessions or lectures from the instructor. Playback from the
recorder and background music are connected to standard mic/line inputs on the Nexia VC. The Nexia
SP has been added to provide the additional outputs required for the room speakers. The speakers are
self-powered, but could instead be driven by a Biamp MCA8050 multi-channel amplifier.
The Nexia VC and SP units are inter-connected in two ways. NexLink allows the two units to share
multiple channels of digital audio with each other. Ethernet allows the units to reside on a common
network, where they can be programmed and controlled as one cohesive system.
In the system design, mic signals enter the Nexia VC via two separate blocks (AEC Input and Pre-AEC).
AEC Input signals include acoustic echo cancellation, and are used for the ‘intercom’ portion of the
system. Pre-AEC signals do not include acoustic echo cancellation, and are used for the recording feed.
In both cases, Levelers are applied to maintain consistent volume levels from the microphones. For the
recording system, a Router (8x1) allows the instructor to select which training room (or his own mic)
will be the source to be recorded. The Router then feeds the Nexia VC Output block (Output 1).
For the ‘intercom’ system, a Router (7x1) determines which room mic is sent to the instructor’s speaker,
and a Router (1x7) sends the instructor’s mic to the corresponding room speaker. Presets (which affect
both Routers) assure proper room/instructor assignment. A Mute block on the instructor’s mic allows
room monitoring with or without return communication. Playback and music signals utilize a Router
(2x8) for assignment of recorded training sessions, instructor lectures, or relaxing music to any room.
All intercom related signals then pass (via NexLink) to the Nexia SP, and enter a Matrix Mixer (16x8)
where microphone and playback/music signals are mixed appropriately for each room. These signals
are then sent both to the room speaker outputs of the Nexia SP and (again via NexLink) back to the
Nexia VC, where they provide the AEC Ref (acoustic echo canceling reference). EQ is applied at the
Nexia SP room speaker outputs, to filter unnecessary frequencies and improve intelligibility.
daVinci software was used to create a custom control screen for the instructor’s PC/touchscreen. The
control screen includes the following selections: training room to be monitored; instructor’s mic on/off;
room/mic to be recorded; and playback/music assignment for individual rooms.
Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com
4-10app.doc
Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com
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