Specifications

122 Chapter 3: Converge® Console Programming
Output channels
Expansion bus channels
Speaker outputs (840T only)
Virtual references
Virtual AEC References
Virtual AEC References allow you to combine multiple audio sources for applications where there are two
speakers (left and right) providing audio to the far side, combined audio/video conferencing, and audio/video
teleconferencing. In these and other multiple output applications, using virtual AEC references improves AEC
performance.
AEC requires a physical output reference to track output gain changes. Therefore when multiple sources are
combined into an virtual AEC reference, you must use output gain tracking to provide level information to the AEC
process. Use the Output Gain Tracking section of the screen (shown above) to specify the level source for each
virtual reference that you define.
Virtual AEC reference sources are defined in a special section of the Matrix (shown below, highlighted in white):
Use the white cross point area to select the outputs for each virtual reference source you want to define. In the
example above, Virtual Ref 1 has been defined for a typical audio/video teleconferencing application, where the
audio is routed to amplified room speakers connected to Output 7, and the incoming audio from a video feed
on the Telco RX channel is routed to speakers adjacent to the video screen (Output 8). Notice that these audio
sources are included in the virtual reference for the associated input channels.
•
•
•
•