| 摘要 |
A line marker signal is added to a DPCM encoded video signal to mark the beginning of each video scan line. The receiver searches for this marker signal and counts pixels between received markers, each scan line having a known number of pixels. The pixel count is checked against the known number of pixels in an error free system. If the pixel count differs from the known count, an error is indicated. The line marker signal is used to reset the decoder so the receiver is resynchronized at each scan line.
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