Universal Pioneer Corporation

Tutomu Fukui

A system for compensating and correcting errors in the time base of video signals read from a video disc in which the errors are corrected first coarsely in response to phase differences between horizontal sync signals of the video signals following which a fine correction is made in response to measured phase differences of burst signals of the video signal. A first phase detector produces an output signal in response to phase differences between the burst signals and an output of a reference frequency generator operating at the burst frequency. A second phase detector produces an output signal in response to phase differences between the horizontal signals and the reference signal divided down by a predetermined factor. The output signals of the two phase detectors are summed and then applied to the control input of a variable delay line which adjusts the delay time and hence phase errors in the video signal accordingly.

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Tokorozawa, Japan

Tutomu Fukui