Apparatus for demodulating sampled data chroma signals

Details Apparatus for demodulating sampled data chroma signals Apparatus for demodulating sampled data chroma signals

1983-02-17

1985-07-02

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 950

Patent

active

045271887

ABSTRACT:
In processing color video signals in sampled data format, the sample rate is nominally far in excess of that required to process the baseband color signals. Thus, when the chrominance signal is demodulated only certain ones of the chrominance signal samples need to be demultiplexed from the data stream to reconstruct the color mixture signals. It is convenient to phase lock a clock to the data stream and select like samples from every sequence of samples. However, the NTSC video format provides a chrominance signal which has a 180 degree phase displacement from line-to-line. Thus, if like samples are selected from all lines, there will be a line-to-line spatial translation of image points on the displayed image giving rise to fine dot crawl along vertical edges of color transitions. The present invention includes a demodulator which demultiplexes sample points which are vertically aligned line-to-line and complements (inverts the polarity) of the samples on every other line. The sampling is effected by providing a sampling clock phase locked with burst and which undergoes a 180 degree phase displacement (relative to burst) responsive to horizontal sync signals.

REFERENCES:
patent: 3946432 (1976-03-01), Goldberg et al.
patent: 4333104 (1982-06-01), Geller
patent: 4337477 (1982-06-01), Sagishima et al.
patent: 4344040 (1982-08-01), Reilly et al.

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