US PATENT SUBCLASS 348 / 684
.~.~.~.~ Keyed

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  DF  .~.~ Automatic range control (e.g., AGC, automatic contrast control) {5}
682  DF  .~.~.~ Sync or blanking {2}
684.~.~.~.~ Keyed

DEFINITION

Classification: 348/684

Keyed:

(under subclass 682) Subject matter wherein the range control is made operative by a control signal during the horizontal sync interval.