US PATENT SUBCLASS 348 / 433
.~.~.~ Including additional modulation of picture carrier (e.g., quadrature)

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}
433.~.~.~ Including additional modulation of picture carrier (e.g., quadrature)

DEFINITION

Classification: 348/433

Including additional modulation of picture carrier (e.g., quadrature):

(under subclass 432) Subject matter wherein the other video information modulates the picture carrier in a manner different than the normal signal.

(1) Note. Included herein are quadrature modulation, phase modulation, and frequency modulation involving modulation of a carrier of the same frequency as the picture carrier and differing in phase by 90 degrees.