Vertical sync signal separator circuit and multi-sync monitor us

Details Vertical sync signal separator circuit and multi-sync monitor us Vertical sync signal separator circuit and multi-sync monitor us

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

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