Color phase correction circuit

Details Color phase correction circuit Color phase correction circuit

1988-10-14

1991-07-09

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358326, H04N 989

Patent

active

050310526

ABSTRACT:
A color phase correction circuit for a video disc playback device comprises a circuit for generating a saw-tooth wave at a timing of a reference signal, a sample-hold circuit for sample-holding the saw-tooth wave at a timing of a synchronizing signal in a reproduced video signal, a circuit for controlling delay time of the reproduced video signal by the sample-hold output and a timing changing circuit for shifting the phase of the saw-tooth wave forward or backward alternately by time length sustantially corresponding to 180 degree phase of color burst at each track-kick. By correcting time base of the reproduced video signal by shifting the phase of the saw-tooth wave at each track-kick, color inversion and color irregularlity occurring in a reproduced picture in a still-picture mode or a trick-play mode can be effectively prevented.

REFERENCES:
patent: 4090215 (1978-05-01), Buchan et al.
patent: 4287529 (1981-09-01), Tatami et al.
patent: 4555734 (1985-11-01), Fukui

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