US PATENT SUBCLASS 348 / 681
.~.~.~ Carrier envelope

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}
681.~.~.~ Carrier envelope

DEFINITION

Classification: 348/681

Carrier envelope:

(under subclass 678) Subject matter wherein the variations in the output signal are determined from the variations in the level of the carrier wave with the modulating signal removed.