US PATENT SUBCLASS 348 / 448
.~ Line doublers type (e.g., interlace to progressive IDTV type)

Current as of: June, 1999
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348 /   HD   TELEVISION

441  DF  FORMAT CONVERSION {9}
448.~ Line doublers type (e.g., interlace to progressive IDTV type) {3}
449  DF  .~.~> Including nonstandard signal detection
450  DF  .~.~> Specified chrominance processing (e.g., Y/C separation) {1}
452  DF  .~.~> Motion adaptive

DEFINITION

Classification: 348/448

Line doublers type (e.g., interlace to progressive IDTV type):

(under subclass 441) Subject matter wherein an input signal has N lines per vertical period and an output signal contains at least 2N lines per vertical period.

(1) Note. Most systems use a progressive scan where vertical periods (field) are in the same position on the display as compared with an interlaced system where lines in adjacent fields are offset. Classified herein are systems that double the number of the lines and produce an interlace display (e.g., conversion from 525 2:1 to either 525 1:1 or 1050 2:1).