This is the principle step to adjust the MIC gain to a suitable value. It is not necessary to set the MIC to its maximum level due to the slope overload effect caused by the CVSD slope, which naturally suppresses the high-frequency parts and works as a low-pass filter. The following figure illustrates the CVSD slope overload effect. This effect distorts the near-end speech and makes it not as clear as the softer MIC gain levels.
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