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:
Jan. 06, 1987
Filed:
Feb. 11, 1985
Mitsushige Tatami, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method and system for converting an analog video input signal into a digital video signal corrects for jitter and other spurious input frequency errors without the need for a time base correction circuit. The phase of the video input signal relative to a reference pulse signal is measured at two points of time during video signal processing and the two measured phase values are compared to derive a phase error signal indicative of the spurious phase error for a corresponding horizontal scan line. The phase error signal is then used to adjust the phase of sampling clock pulses used to sample analog video input signal values of the corresponding scan line for conversion to digital values. Each clock pulse is phase-shifted only slightly, as the derived spurious phase error is distributed evenly among all of the clock pulses for the corresponding scan line. Preferably, the phase error is distributed linearly across the corresponding scan line and mirror-symmetrically about the center of the scan line.