Time difference correction circuit for brightness and chrominanc

Details Time difference correction circuit for brightness and chrominanc Time difference correction circuit for brightness and chrominanc

1991-02-08

1992-10-27

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358320, H04N 944, H04N 989

Patent

active

051594404

ABSTRACT:
A time difference correction circuit for brightness and chrominance signals divides a signal from a tape detected by a tape head into a brightness signal and a chrominance signal, demodulates and filters the signals, and then adds them to produce a composite video signal. The circuit includes a delay element for delaying the chrominance signal by a predetermined horizontal interval, and a vertical synchronizing signal generation circuit for detecting a vertical synchronizing signal in the brightness signal and delaying it to a start point of a video signal. The circuit further includes a switch for switching the brightness and chrominance signals at the start point, a comparison circuit for comparing the brightness and chrominance signals, a difference signal generation circuit which generates an output signal indicative of the difference between the brightness and chrominance signals, a time difference signal detection circuit for detecting a time difference between the brightness and chrominance signals and for outputting a polarity signal corresponding to the time difference, and an inverter for inverting the polarity of the difference signals using the time difference signal as a control signal. The circuit further includes a reset circuit for differentiating the output of the vertical synchronizing signal generation circuit and outputting only the positive component of the differentiated signal as a control signal. A voltage controlled oscillator is provided having a frequency variable with the level and polarity of the output signal of the invertor and which outputs an oscillation frequency to the delay line element.

REFERENCES:
patent: 3629491 (1971-12-01), Dann et al.
patent: 3820154 (1979-06-01), Faroudja et al.
patent: 4193085 (1980-03-01), Imamura
patent: 4485395 (1984-11-01), Warren
patent: 4864387 (1989-09-01), Tatami

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