A random number generator generates the comfort noise, and its frequency response is
constant across all frequencies. The main purpose is to provide a constant noise level
to prevent the speech codec algorithm of host cell phones from injecting unwanted noise,
which degrades speech clarity at the far-end listener side.
Note: Background noise adjusts the level
of the comfort noise.
The following figure illustrates the parameters to adjust the configuration of the
digital MIC gain and comfort noise.Figure 4-6. Parameters for MIC Gain and Comfort Noise
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