Video recording unit featuring switching logic means for generat

Details Video recording unit featuring switching logic means for generat Video recording unit featuring switching logic means for generat

1990-08-09

1992-10-20

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358340, 358328, H04N 578

Patent

active

051575582

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.

REFERENCES:
patent: 4007482 (1977-02-01), Amari
patent: 4007484 (1977-02-01), Amari
patent: 4165518 (1979-08-01), Hirai
patent: 4178606 (1979-12-01), Hirota
patent: 4208673 (1980-06-01), Numakura
patent: 4654726 (1987-03-01), Kluth
patent: 4862099 (1989-08-01), Nakai

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