AGC
Automatic Gain Control. Electronic circuitry that assures a fixed predefined output level, automatically compensating for varying input levels. Used in audio, video and RF equipment to ensure that output signals are maintained at constant levels in the face of wide variations in the signal-input levels. Low level signals are boosted and high level signals are attenuated to an average level. Automatic gain control has a tendency to introduce audio noise and hiss into the audio channel of a videotape. In sophisticated equipment, automatic gain control is often superfluous, and the user can select the option of manual control
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