DEFINITION OF TERMS
© Polycom, Inc. 67 VORTEX EF2280 Reference Manual
Room Gain The room gain of a conferencing system refers to the relative levels of the sig-
nal sent to the line output to your amplifier (before any amplification) and the
level of this signal 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 output 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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