H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/19
H04N 5/782 (2006.01) G11B 20/10 (2006.01) H04N 5/92 (2006.01) H04N 5/935 (2006.01)
Patent
CA 1193359
ABSTRACT A horizontal sync pulse control circuit for a video tape recorder of the type utilizing pulse code modu- lation in a standard format, where there is a fixed time interval between each horizontal sync pulse and the beginning of the data pulse train for the corresponding video line. Delay circuitry and associated signal process circuitry is used to monitor this time interval. When the monitored time interval between the horizontal sync pulse and the first data pulse for the corresponding line differs from the correct time interval by one bit or less, the position of the horizontal sync pulse is re-synchronized utilizing a clock locked to the video signal. When the interval between the horizontal sync pulse and the first data pulse of the corresponding line exceeds one bit, the horizontal sync pulse is blanked, so that noise which would otherwise be produced by an incorrect horizontal sync pulse is eliminated.
410338
Eguchi Takashi
Hirota Yutaka
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Ltd.
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