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:
Aug. 19, 1986
Filed:
Mar. 31, 1983
Noboru Kojiam, Yokohama, JP;
Tomomitsu Kuroyanagi, Katsuta, JP;
Akira Shibata, Katsuta, JP;
Isao Nakagawa, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A color signal processing circuit in a video tape recorder for recording a low frequency converted color signal has a voltage controlled oscillator for generating a carrier having a center frequency which is M times as high as a low-frequency sub-carrier frequency, where M is an integer, and a detection circuit for detecting a variation of the oscillation frequency of the voltage controlled oscillator in at least a reproduction mode. A suppression circuit suppresses the change of the oscillation frequency of the voltage controlled oscillator in response to the output signal from the detection means and a control circuit changes the center oscillation frequency of the voltage controlled oscillator depending on whether the signal is processed in the NTSC system or the system in such a way that the suppression range for the change of the oscillation frequency of the voltage controlled oscillator by the suppression for the NTSC system is equal to or wider than that for the system. The control circuit includes a pulse-eliminating frequency divider or a variable frequency division factor.