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:
Jun. 11, 1991
Toshio Tabata, Tokyo, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A video-signal-distortion reducing apparatus comprising a filter circuit for selectively passing a broadcast television signal (BC signal) and a laser disc video signal (LD signal). The broadcast television signal has a GCR signal in 18H and 281H of its scanning lines while the laser disc signal has commmand signals for other purposes in 18H and 28H of its scanning lines. A GCR signal is assigned to other scanning lines than 18H and 281H of the laser disc signal. A GCR waveform memory selectively stores the GCR signal superimposed on BC signal in response to a BC signal selecting commmand produced by a timing generator and the GCR signal superimposed on the LD signal in response to an LD signal selecting command. An arithmetic operational circuit detects a delay time and an amplitude difference of the GCR signal stored in the GCR waveform memory relative to a reference GCR signal and controls the filter characteristic such that the delay time and the amplitude difference are minimized.