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:
Dec. 04, 1979
Filed:
Jul. 11, 1977
Kazuo Yamagiwa, Tokyo, JP;
Masahiro Tada, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
In recording periodic information signals having first intervals and second intervals which are subdivisions of the first intervals, for example, the chrominance components of color video signals having field and line intervals, and which are recorded in respective areas or increments of successive parallel tracks on a record medium; interference due to crosstalk between signals recorded in next adjacent tracks is substantially reduced or eliminated by recording the information signals in such next adjacent tracks with first and second carriers, respectively, which have their phases changed in opposite directions by 2.pi./N and 2.pi./M, respectively, for successive second intervals, with each of N and M being a whole number greater than 2 which is negative to indicate a phase change or shift in the clockwise direction or positive to indicate a phase change in the counterclockwise direction, and with each of N and M being selected to satisfy the equation 1/N-1/M=1/2.