US PATENT SUBCLASS 348 / 678
.~.~ Automatic range control (e.g., AGC, automatic contrast control)

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
671  DF  .~ Gray scale transformation {5}
678.~.~ Automatic range control (e.g., AGC, automatic contrast control) {5}
679  DF  .~.~.~> Color television
680  DF  .~.~.~> At transmitter
681  DF  .~.~.~> Carrier envelope
682  DF  .~.~.~> Sync or blanking {2}
685  DF  .~.~.~> Delayed AGC

DEFINITION

Classification: 348/678

Automatic range control (e.g., AGC, automatic contrast control):

(under subclass 671) Subject matter including apparatus to develop a control signal in response to input signal variations to maintain the output signal level constant in various parts of the circuit.

SEE OR SEARCH CLASS

455, Telecommunications,

234.1+, for automatic gain control devices.