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. 08, 1987
Filed:
Apr. 04, 1986
Applicant:
Inventor:
Katsumi Tobita, Soma, JP;
Assignee:
Alps Electric Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ; H04N / ;
U.S. Cl.
CPC ...
358143 ; 358196 ; 358198 ; 358 86 ;
Abstract
A CATV converter has a phase locked loop (PLL) circuit for controlling the sound carrier wave frequency of the audio signal component of the resulting TV signal. The PLL circuit receives as inputs a branched part of the video signal component and a part of the audio signal output of an audio modulator for providing an output control signal to the audio modulator representing a selected frequency difference to be maintained between the video carrier wave frequency of the video signal and the sound carrier wave frequency of the audio signal output of the audio modulator.