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:
Oct. 25, 1988
Filed:
Feb. 08, 1988
Yasuo Yagi, Tokyo, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A contour compensating circuit is disclosed for compensating a video signal in such a manner as to obtain contour portions which are not overly stressed. The compensating operation of the contour compensating circuit according to this invention is performed by obtaining a full-wave rectified signal of the primary differentiated signal of a video signal and the positive- and negative-phase signals of a secondary differentiated signal thereof and forming a secondary pseudo-differentiated signal with a narrow pre and post overshooting width range from the signals obtained by selecting a first higher level signal between the full-wave rectified signal and one of the positive-phase signal and the half-wave signal thereof identical in porality with the full-wave signal, selecting a second higher level signal between the full-wave rectified signal and one of the negative-phase signal and the half-wave signal thereof identical in porality with the full-wave signal and comparing the first and second higher level signals, half-wave signal and the full-wave rectified signal. The resulting signal is superposed on the video signal.