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:
Jun. 09, 1987
Filed:
Jul. 03, 1985
Yoshinori Okada, Katsuta, JP;
Hisaji Watanabe, Schaumburg, IL (US);
Isao Fukushima, Katsuta, JP;
Hideo Yoshida, Katsuta, JP;
Hitachi Microcomputer Engineering Co., Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A VTR is furnished with a phase-locked loop whose reference input is a color signal subcarrier. The phase-locked loop fixes two sound FM carrier frequencies in constant relationships with the frequency of the color signal subcarrier, thereby to stabilize the carrier frequencies. The two sound FM carrier frequencies are respectively selected to be integral times of f.sub.H /2 (where f.sub.H denotes the frequency of a horizontal synchronizing signal). The frequencies of the beats between both the sound carrier are fixed to integral times of f.sub.H /2, with the result that the degradation of a reproduced picture attributed to the beats is prevented.