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:
Dec. 08, 1992
Filed:
Mar. 28, 1991
Richard Griffen, Hants, GB;
Abekas Video Systems, Inc., Redwood City, CA (US);
Abstract
A video processing apparatus receives an analog color composite video signal, which has a color burst and generates a D2 digital signal sampled at a certain phase relationship with the color burst by a sampling clock. The analog video signal is phase shifted to produce a 'zero' video signal. The analog video signal and the phase shifted video signal are added together to produce a sum video signal. The sum video signal is clocked into a latch by the sampling clock signal. The output of the latch is delayed by two clock pulses to produce a delay clocked video signal. The delay clocked video signal is compared with the output of the latch to produce a comparing signal. The comparing signal is used to adjust the phase of the sampling clock signal to automatically control the phase relationship between the analog video signal and the sampled digital signal.