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:
Sep. 06, 1977
Filed:
Feb. 26, 1976
Namio Yamaguti, Ibaragi, JA;
Matsushita Electric Industrial Co., Ltd., Kadoma, JA;
Abstract
Ghost phenomenon on a screen of a television receiver is removed by supplying an intermediate frequency video signal including a desired signal and a ghost signal to a pair of parallel circuits, each including a synchronous or multiplication detection circuit. The detection axis or reference phase of the first detection circuit differs from the second detection axis or reference phase by an amount equal to the phase difference between the desired signal and the ghost signal. Either the detected video signal in one of the parallel circuits or the intermediate frequency signal applied to one of the parallel circuits is delayed an amount equal to the delay time between the desired signal and ghost signal, and the signals from both circuits are combined in a suitable ratio to cancel the ghost signal.