Eliminating Feedback - Polycom SoundStructure C16 Design Manual

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Notch filters eliminate energy (attenuate only) at the center frequency. The amount of attenuation for the

signal is determined by the bandwidth (in octaves) selected. The bandwidth is defined as where the gain is

Allpass filters do not modify the gain of the signal, but change the phase. For a second order allpass filter,

the phase shift is 0 degrees at 0 Hz, 360 degrees at high frequencies, and 180 degrees at the center

frequency. The bandwidth is defined as the bandwidth (in octaves) where the phase shift is 90 degrees and

270 degrees.

Eliminating Feedback

Feedback elimination uses 10 adaptive filters to reduce feedback that may be picked up by the microphone.

When the feedback cancellation processing is enabled for a particular virtual channel, you can adjust the

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