Television – Synchronization – Sync separation
Patent
1993-04-29
1996-03-26
Groody, James J.
Television
Synchronization
Sync separation
348532, H04N 508
Patent
active
055025005
ABSTRACT:
A circuit that extracts the synchronization signal from a composite video signal. The circuit includes a stage for aligning the low level of the synchronization signal interval with a reference voltage; a stage for detecting the signal suppression level and a comparator for comparing the aligned video signal with a value intermediate between the low level of the synchronization interval and the signal suppression level. The detecting stage includes a second comparator charging or discharging a capacitor depending on the polarity of the voltage difference across its inputs. The ratio Ic/Id between the values of the charging and discharging currents is selected (approximately equal to 8 in one embodiment) to obtain the suitable value Vsup at the second input of the comparator.
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patent: 4680626 (1987-07-01), Deering et al.
patent: 5045943 (1991-09-01), Kurihara
Dorny Brett N.
Driscoll David M.
Groody James J.
Lee Michael H.
Morris James H.
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