Polycom Vortex EF2280 Reference Manual page 58

Room Gain
V EF2280 Reference Manual
ORTEX
The room gain of a conferencing system refers to the relative levels of the signal sent
to the line output to your amplifier (before any amplification) and the level of this sig-
nal that is reflected at the microphone input (after microphone amplification). If the
electrical level of the reflected signal picked up by the microphone is the same as the
level of the electrical signal sent from the AEC to the line output to your amplifier,
the room gain of this microphone channel is said to be 0 dB. If the reflected signal
picked up by the microphone is higher than the level of the signal sent to the line out-
put to your amplifier, that microphone channel has positive room gain. The more
positive the room gain, the harder the AEC must work to determine which signal is an
echo and which is a local speech signal.
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