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:
Aug. 28, 1984
Filed:
Sep. 14, 1981
Hideyuki Kenjyo, Koganei, JP;
Olympus Optical Co. Ltd., , JP;
Abstract
In a jitter correction circuit for correcting a time base error caused in a color television signal readout from a video disc due to a fluctuation in a disc rotating speed and an eccentricity of the disc, a first closed loop control circuit includes a first phase difference detector for detecting a first phase deviation of a horizontal synchronizing signal of the color television signal and a first variable time constant lag filter for producing a first control signal in response to the first phase deviation and a second closed loop control circuit includes a second phase difference detector for detecting a second phase deviation of a color burst signal of the color television signal and a second variable time constant lag filter for producing a second control signal in response to the second phase deviation. When the first phase deviation is greater than a predetermined level, only the first control signal is supplied to a voltage controlled oscillator to produce clock pulses for driving a delay device formed by a number of charge coupled devices. When the first phase deviation is reduced to the predetermined level, a sum of the first and second control signals is supplied to the voltage controlled oscillator.