Room Gain - Polycom SoundStructure C16 Design Manual

Sensitivity Information for Tabletop Microphones
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-28.0
-26.0
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-22.0
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Room Gain

Room gain meters are used to measure the relative level of the remote audio that is present at the input to
the AEC with the level of the echo that is present at the microphone. For more information on room gain and
how it is measured, see Appendix C.
The room gain meter is shown on the AEC portion of the input channel on the channels page as shown in
the following figure. The meter segments show the room gain ranges in 3dB increments from -10 to +20dB.
The first segment of the meter is lit if the room gain is greater than -10dB and less than or equal to -7, and
so on through the meter segments. The last meter segment illuminates if the room gain is greater than 17dB.
Room Gain Meter
-10 -7 -4 -1 2
The following figure shows different room gain measurements that may be found in a typical room. Room
gain is considered good if it is negative, meaning that the echo picked up by the microphone is less than the
Polycom, Inc.
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5 8 11 14 17
31.6
39.8
50.1
63.1
79.4
100.0
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