Compatible, transcodeable, and hierarchical digital tv system

Details Compatible, transcodeable, and hierarchical digital tv system Compatible, transcodeable, and hierarchical digital tv system

H - Electricity

04

N

350/36

H04N 11/20 (2006.01) H04N 7/01 (2006.01)

Patent

CA 1203314

-20- RCA 76,709 ABSTRACT OF THE DISCLOSURE A digital television system in which signals are sampled at 13.5 MHz and produce an integer number of samples during each horizontal line interval whether the signals are based upon PAL/SECAM or NTSC standards. In order to make the digital system hierarchical and to adapt it for simple transcoding from an NTSC signal sampled at 4 times color subcarrier, the number of samples occurring during the active portion of each horizontal line is made equal to 704. Transcoding by interpolation from 4XSC - sampled NTSC video to the digital system is accomplished by selecting a particular number of samples per active line such that small blocks of samples can be transcoded independently, which allows interpolation to be achieved simply.

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