Time axis deviation compensation apparatus

Details Time axis deviation compensation apparatus Time axis deviation compensation apparatus

1985-04-12

1987-03-03

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358325, H04N 989

Patent

active

046479848

ABSTRACT:
An apparatus for compensation of time axis deviations of a reproduced composite video signal, based on detection of phase deviations of the horizontal sync and color burst components respectively of that video signal, incorporates a summing circuit in which are added a signal indicating the phase deviation of the horizontal sync component and a low-frequency signal component of the output from a phase comparator which detects phase deviations of the color burst component, with the sum output signal from the summing circuit being applied to control the delay produced by a variable delay line through which the video signal is transferred. The output signal from the latter phase comparator controls phase modulation by a phase modulator which receives the video signal from the delay line output. Fixed frequency reference signals, which can be derived from a single oscillator circuit, are employed for phase comparison of both the color burst and sync signal components, with no phase lock loop circuit being necessary.

REFERENCES:
patent: 4313129 (1979-10-01), Fukui
patent: 4468709 (1984-08-01), Kenjyo

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