US PATENT SUBCLASS 348 / 701
.~.~ Specified processing of frame or field difference signal (e.g., noise reduction, key signal spreading)

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
700  DF  .~ Motion dependent key signal generation or scene change detection {2}
701.~.~ Specified processing of frame or field difference signal (e.g., noise reduction, key signal spreading)

DEFINITION

Classification: 348/701

Specified processing of frame or field difference signal (e.g., noise reduction, key signal spreading):

(under subclass 700) Subject matter including specific circuitry to generate a frame or field difference signal and to further process the difference signal before the motion key signal is generated.