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. 01, 1989
Filed:
Mar. 09, 1988
Yoshikazu Asano, Kakamigahara, JP;
Kazuo Naganawa, Kakamigahara, JP;
Sanyo Electric Co., Osaka, JP;
Abstract
A frame synchronizing signal detecting circuit detects a frame synchronizing signal in a video signal. When the frame synchronizing signal is not detected by the frame synchronizing signal detecting circuit, a clamp level switching circuit is responsive to a switching signal from a timer circuit for generating alternately an upper clamp potential V.sub.+ and a lower clamp potential V.sub.-. When the frame synchronizing signal is detected by the frame synchronizing signal detecting circuit, the clamp level switching circuit generates a normal clamp potential V.sub.0. A clamping pulse generating circuit is responsive to an output from the frame synchronizing signal detecting circuit for generating a clamping pulse. A clamping circuit is responsive to the clamping pulse for clamping an analogue video signal at the clamp potentials V.sub.0, V.sub.+ or V.sub.- from the clamp level switching circuit.