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DEFINITION OF TERMS
© Polycom, Inc. 59 VORTEX EF2241 Reference Manual
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.