The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 1991
Filed:
Oct. 14, 1988
Sadayuki Narusawa, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A color phase correction circuit for a video disc playback device comprises a circuit for generating a saw-tooth wave at a timing of a reference signal, a sample-hold circuit for sample-holding the saw-tooth wave at a timing of a synchronizing signal in a reproduced video signal, a circuit for controlling delay time of the reproduced video signal by the sample-hold output and a timing changing circuit for shifting the phase of the saw-tooth wave forward or backward alternately by time length sustantially corresponding to 180 degree phase of color burst at each track-kick. By correcting time base of the reproduced video signal by shifting the phase of the saw-tooth wave at each track-kick, color inversion and color irregularlity occurring in a reproduced picture in a still-picture mode or a trick-play mode can be effectively prevented.