Television – Synchronization – Sync separation
Patent
1996-11-19
1998-09-08
Grant, Christopher C.
Television
Synchronization
Sync separation
348525, H04N 508
Patent
active
058052321
ABSTRACT:
The present invention includes a capacitor, a charge/discharge circuit for generating a charging current having a value increasing with the increase of the frequency of the horizontal sync signal to charge the capacitor in a time period of the horizontal sync signal and a time period of the vertical sync signal. The charge/discharge circuit discharges the capacitor in other time periods to reduce a difference of the horizontal sync signal frequency. A comparator compares the voltage of the capacitor with a predetermined reference voltage to detect the vertical sync signal.
REFERENCES:
patent: 4313137 (1982-01-01), Weissmueller
Grant Christopher C.
Rohm & Co., Ltd.
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