Television – Synchronization – Sync generation
Patent
1997-01-14
2000-06-06
Peng, John K.
Television
Synchronization
Sync generation
348500, 348525, 348524, 348522, 358153, H04N 506, H04N 508, H04N 510
Patent
active
060725338
ABSTRACT:
A sync signal generator with a signal discriminator comprising an input terminal supplied with a fist signal or a second signal of a higher frequency; a clock signal generating circuit; a first counter reset by the first or second signal received from an input terminal, and caused to halt counting the clock signal when the count thereof has reached a predetermined value MC4; a first detector for outputting a detection signal relative to the first or second signal during the counting action of the first counter; a second counter reset when the count of the first counter has reached a predetermined value MC1, and caused to halt counting the clock signal when the count of the first counter has reached a predetermined value MC2 (MC2<MC4), and to output a detection signal (SMAX) when the count thereof has reached another predetermined value SC1 (SC1<MC2); a second detector for outputting a detection signal relative to the second signal in response to the detection signal (SMAX) from the second counter; and a third detector supplied with the detection signals from the first and second detectors and outputting a discrimination signal relative to the first and second signals in accordance with such detection signals. The first signal is a square wave signal formed out of an alternating current obtained from an AC power source, and the second signal is a burst signal separated from a video signal.
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Desir Jean W.
Frommer William S.
Peng John K.
Sony Corporation
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