The digital MIC gain provides different digital control functions at the microphone path and allows the user to boost the volume digitally. If the analog amplifier of ADC is unable to provide enough gain, the digital boost part of the dynamic MIC control is placed at the end of all digital signal processing modules (see the following figure).
The user can amplify the suppressed echo by adjusting the digital MIC gain.
Note: The DSP configuration tool automatically updates the
available selections of the dynamic range according to the MIC gain (codec).
The following figure illustrates the parameters to adjust the configuration of the digital MIC gain and comfort noise.Figure 4-5. Parameters for MIC Gain and Comfort Noise
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