US PATENT SUBCLASS 348 / 436
.~.~.~ Including the use of a subcarrier

Current as of: June, 1999
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348 /   HD   TELEVISION

384  DF  BANDWIDTH REDUCTION SYSTEM {7}
426  DF  .~ Format type (e.g., HDTV or EDTV) {3}
432  DF  .~.~ Added video information in standard channel format (e.g., compatible EDTV) {3}
436.~.~.~ Including the use of a subcarrier

DEFINITION

Classification: 348/436

Including the use of a subcarrier:

(under subclass 432) Subject matter wherein the additional signal is modulated on a carrier having a frequency other than the picture carrier, but located in the bandwidth of the video signal.