HDTV compatible vertical sync separator

Details HDTV compatible vertical sync separator HDTV compatible vertical sync separator

1996-10-23

1998-12-01

Grant, Chris

Television

Synchronization

Sync separation

348525, H04N 508

Patent

active

058446265

ABSTRACT:
A vertical sync separator circuit that operates with signals that have different arrangements of horizontal equalizing pulses in the vertical interval. The composite signal is integrated and used to operate a Schmidt trigger/inverter that feeds the data input of a D flip/flop. The flip/flop is clocked by the horizontal equalizing pulse that occurs after the beginning of the vertical pulse. In an arrangement that operates without equalizing pulses, a second trigger circuit is operates from a less than one-half line delay and supplies the reset input of the flip/flop. The arrangement provides consistent development of the vertical sync output pulse.

REFERENCES:
patent: 4319273 (1982-03-01), Nossem
patent: 4387396 (1983-06-01), Tanaka et al.
patent: 4792853 (1988-12-01), Yamagishi et al.
patent: 4985770 (1991-01-01), Nagashima et al.

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