| 摘要 |
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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