US PATENT SUBCLASS 348 / 641
.~.~ For quadrature signal (e.g., NTSC)

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
638  DF  .~ Chrominance signal demodulator {3}
641.~.~ For quadrature signal (e.g., NTSC)

DEFINITION

Classification: 348/641

For quadrature signal (e.g., NTSC):

(under subclass 638) Subject matter for demodulating a carrier which has been modulated by two components at two distinct phases.