Automatic Gain Control

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.

Famous quotes containing the words automatic, gain and/or control:

    She smoothes her hair with automatic hand,
    And puts a record on the gramophone.
    —T.S. (Thomas Stearns)

    She is watching her country lose its evoked master shape watching
    it lose
    And gain get back its houses and peoples watching it bring up
    Its local lights single homes lamps on barn roofs
    James Dickey (b. 1923)

    We human beings do have some genuine freedom of choice and therefore some effective control over our own destinies. I am not a determinist. But I also believe that the decisive choice is seldom the latest choice in the series. More often than not, it will turn out to be some choice made relatively far back in the past.
    —A.J. (Arnold Joseph)