Patent ID: 7443455

Claim:
A video decoder, comprising: input interface circuitry for receiving an input video signal; separation circuitry, for separating the received input video signal into signal components; output format circuitry for presenting an output signal to a video display; a first automatic gain control circuit, having an output coupled to an input of the separation circuitry, and comprising: a gain stage for amplifying a signal corresponding to the input video signal by a first gain value; and gain update circuitry, for modifying the gain value responsive to a selected one of a plurality of signal attributes of the input video signal; and a second automatic gain control circuit, having at least one input coupled to a corresponding output of the separation circuitry, and comprising: at least one gain stage for amplifying a signal corresponding to the output of the separation circuitry by a second gain value; and gain update circuitry, for modifying the second gain value responsive to a selected one of a plurality of signal attributes of the input video signal.