automatic gain control

automatic electronic regulation by recording devices of video and audio signals at a predetermined level (by electronic control), AGC

Automatic gain control (AGC) is an adaptive system found in many electronic devices. The average output signal level is fed back to adjust the gain to an appropriate level for a range of input signal levels. For example, without AGC the sound emitted from an AM radio receiver would vary to an extreme extent from a weak to a strong signal; the AGC effectively reduces the volume if the signal is strong and raises it when it is weaker.
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A process or means by which gain is automatically adjusted in a specified manner as a function of a specified parameter, such as received signal level. (188 )

automatic gain control
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