Comb filter for the rejection of intertrack chromonance crosstalk
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Mar 21, 1988
filing date -
Mar 28, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In known color-under video recorders intertrack chrominance cross talk is eliminated by comb-filtering of the back-converted chrominance signal. However, if the delay circuit needed in the comb filter is a CCD delay line this will give rise to problems both in respect of production engineering and circuit design. These problems are mitigated by the novel comb filter. Comb filtering is applied to the down-converted chrominance signal. The signal path in which the signal is delayed includes a clocked CCD delay line and a phase correction circuit having a linear frequency response and whose dimensioning is such that the overall delay of the chrominance signal corresponds to the signal periodicity imposed by the signal standard and that the phase shift which occurs in the down-converted signal as a result of the recording standard in conjunction with the signal standard is eliminated. The invention can be applied to PAL video recorders, NTSC video recorders, multi-standard video recorders, and vertical pre-emphasis and de-emphasis in video recorders.
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