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. 31, 2010
Filed:
Aug. 22, 2006
Applicants:
Raymond William Hall, Riverside, CA (US);
Donald E. Parreco, Covina, CA (US);
Inventors:
Raymond William Hall, Riverside, CA (US);
Donald E. Parreco, Covina, CA (US);
Assignee:
RGB Systems, Inc., Anaheim, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N 9/72 (2006.01); H04N 5/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A feedback circuit for restoration of DC in video signals is presented. A sample pulse representing the back porch of an incoming video signal is generated from the horizontal sync signal. The sample pulse triggers a sample and hold circuit to acquire the correct offset voltage in the output signal during this back porch period. The offset voltage feeds back through a summing node upstream of either the circuit causing the offset or an input amplifier thereby restoring the video signal to the desired DC voltage level with respect to ground.