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:
Mar. 14, 1978
Filed:
Jan. 25, 1977
Yositeru Kosaka, Kamakura, JA;
Victor Company of Japan, Limited, Yokohama, JA;
Abstract
A signal processing circuit is used in a color video signal recording and/or reproducing apparatus. The frequency of an original carrier chrominance signal is separated from an input color video signal and is converted into a low frequency band and/or reconverted from the low frequency band, back into the original frequency band. Rotating heads record and/or reproduce a video signal, including the converted carrier chrominance signal, on and/or from parallel tracks on the recording medium. The signal processing circuit determines the timing of phase shifting for every successive horizontal scanning period in response to a horizontal synchronizing signal separated from the video signal. The direction of phase shifting is determined in response to a signal supplied responsive to every scanning period of the rotating heads. A signal of frequency 4fs and the timing of phase shifting cooperate for determining the direction of phase shifting, and for forming a signal having a frequency fs. The phase angle shifts by 90 degrees for every successive horizontal scanning period. The phase shifting direction is inverted alternately for every successive scanning period of the rotating heads. The formed signal, of frequency fs, is utilized for a frequency conversion signal to be supplied to the frequency conversion means.