Polycom C16 - Manual (Page 428)

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
A - 86
The index is used to specify the left (1) or right (2) reference channels. If neither
the left nor the right channel have references specified, then the AEC is disabled. If
only the left channel is specified, then the mono AEC algorithm is used. If both the left
and right channel are specified, then the stereo AEC algorithm is used.
If the reference's virtual channel is mono, then the corresponding physical
channel is used as the AEC reference. If the reference's virtual channel is
stereo, then either the left or right physical channel is used as a reference,
depending on which index is specified (1 for left, 2 for right).
If the AEC is on a stereo virtual channel, then the reference specifications apply
to both physical channels of the stereo virtual channel.
agc_en Enable Automatic Gain Control
Description
This parameter enables (1) or disables (0) the automatic gain control (AGC)
algorithm.
agc_max_gain AGC Maximum Gain
Argument Argument value
Channel Type Virtual Channel
Value Type Boolean
Read/Write Mode Read/Write
Phys Chans Conferencing Mic/Line Input, Sound Reinforcement Mic/Line
Input, Analog Telephony Input
Virt Chans Mono, Stereo
Default 0
Argument Argument value
Channel Type Virtual Channel
Value Type Floating-Point
Read/Write Mode Read/Write
Phys Chans Conferencing Mic/Line Input, Sound Reinforcement Mic/Line
Input, Analog Telephony Input
Virt Chans Mono, Stereo
System Limits Minimum: 0.0, Maximum: 20.0, Resolution: 0.1
Default 6.0
User Limits
Supported No