Sharp Kabushiki Kaisha Corporation

Masakazu Ishikawa

Satoshi Murakami

Naoki Koide

Soichi Iwamura

An improved jitter detecting method and an apparatus thereof, for detecting jitter generated in a reproduced video signal of a VTR or video disc wherein a frequency-modulated carrier of a video signal is recorded by synchronizing the leading edge of a sync signal with the phase of the forefront carrier of a constant frequency carrier train corresponding to a sync tip for every horizontal period at the time of frequency-modulation. From the reproduced frequency-modulated carrier, the phase-reset constant frequency carrier train is utilized as a reference burst signal, thereby to be capable of removing a time-base error by detecting a specific zero-crossing timing of the carrier burst through a bandpass filter based on the trailing edge of a frequency-modulated sync signal during reproduction.

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Abiko, Japan

Masakazu Ishikawa