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:
Oct. 20, 1992
Filed:
Aug. 09, 1990
Gerd Reime, Wurmberg, DE;
Nokia Unterhaltungselektronik GmbH, Pforzheim, DE;
Abstract
A device for recording FM signals in helical-scan tracks of a video magnetic tape has a phase shifter disposed between an FM modulator and a write-head configuration, which subjects the FM signal from the FM modulator to a phase shift. The phase shifter determines a phase shift for a luminance signal which is determined by a first phase shift P1 for a line n of a track m; a second phase shift P2 for a line n+1 of the track m; and a third phase shift P3 for the line n located in the track m+1. For the line n+1 located in the track m+1, a fourth phase shift P4 has a value determined by the other three phase shifts such that a total phase difference D between a first phase difference D1 of the fourth and the second phase shifts (D1=P4-P2) and a second phase difference D2 of the third and first phase shifts (D2=P3-P1) measures 180.degree. (D=D1-D2=180.degree.), whereby a cross-talk interference which in line n leads to brightening as compared to an original brightness, results in line n+1 having an offsetting equally large darkening.