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:
Apr. 30, 1991
Filed:
Oct. 23, 1989
Takatsugu Kurata, Ibaraki, JP;
Takuya Nishide, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A field discrimination circuit for use in a television receiver, which includes a shift register for shifting an input vertical synchronizing signal so as to produce n (n.gtoreq.6) pseudo vertical synchronizing signals having the same phase difference, a selector for selecting one of the n pseudo vertical synchronizing signals and delivering the selectd pseudo vertical synchronizing signal as a reference vertical synchronizing signal, a latch circuit for detecting input timing of the reference vertical synchronizing signal into one of n time sections obtained by dividing one horizontal scanning period by n, to thereby generate a latch output signal, and a decoder for effecting field discrimination on the basis of the latch output signal and generating a field discrimination signal.