( Electrical engineering : Computing and control )
The effect of the automatic gain control is to reduce the gain and the signal level provided to a successive output buffer
stage in order to improve the linearity of the overall amplifier chain.
Some telephone recording devices incorporate automatic gain control to produce acceptable-quality recordings.
Automatic gain control is a circuit that modulates an amplifier's gain, in response to the relative strength
of the input signal, in order to maintain the output power.
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