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Video-signal-processing-circuit

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Video signal processing circuit

Details

Inventors: Kato, Tetsuro;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Masinick; Michael A.
Attorney, Agent or Firm: Eslinger; Lewis H., Sindebrand; Alvin

A video signal processing circuit particularly suited for eliminating undesirable picture vibration in the stop-motion, or slow-motion mode of a video reproducing apparatus includes a source of a video signal, a delay line for delaying the video signal one line interval and thereby providing a delayed version of the video signal, a switching circuit connected with the source of the video signal and with the delay line for alternately applying the video signal and the delay version thereof to an output, and a control circuit connected to the switching circuit for causing the switching circuit to switch over at a sampling rate which is sufficient to sample the video signal a plurality of times during each line interval. One embodiment of the video signal processing circuit is adapted to process a digitized composite color video signal formed of digital words each composed of a predetermined number of bits which are processed in parallel form, and the sampling rate at which the switching circuit is switched over is identical with the rate at which the digital words are provided at the source of the video signal.

DETAILED DESCRIPTION An object of this invention is to provide a novel video signal processing circuit which avoids previously mentioned problems inherent in the previously proposed devices.
Another object of this invention is to provide a video signal processing circuit for a reproducing apparatus which permits operation in various reproducing modes, such as slow motion, still or stop motion, fast motion, and reverse, without vertical shift of the displayed video picture or image from field to field.
Still another object of this invention is to provide a video signal processing circuit which facilitates interlaced scanning.
A further object of this invention is to provide a video signal processing circuit which may be used in conjunction with a video-sheet, video-disc, or helically-scanned video-tape reproducing apparatus.
A still further object of this invention is to provide a video signal processing circuit which may be used with a reproducing apparatus employing a time base corrector.
A yet further object of this invention is to provide a video signal processing circuit which can process a digitized video signal and which will eliminate vertical shift of the digitized video from field to field when a single field of said digitized video is repeatedly displayed.
According to one aspect of this invention, a circuit for processing a video signal made up of field intervals each having a plurality of horizontal line intervals, comprises a source of the video signal; a processed video output terminal; a delay line connected with the source for delaying the video signal for a horizontal line interval, thereby providing a delayed version of the video signal; a switch connected with the source and with the delay line for alternately applying the undelayed video signal and the delayed version thereof to the processed video signal output terminal; and a signal generating circuit for providing a sampling signal to the switch to cause the latter to switch or change over at a sampling rate sufficient to sample the video signal at least several times during each line interval

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