Method for generating head switching signals in video cassette r

Details Method for generating head switching signals in video cassette r Method for generating head switching signals in video cassette r

1996-07-03

2000-02-01

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 70, 386 46, 386 51, G11B 1514

Patent

active

060210141

ABSTRACT:
A head switching signal generation apparatus for a VCR includes a pulse signal generator for generating a first pulse signal having the same phase and period of time as a head drum pulse signal in response to the head drum pulse signal, an envelope detector for detecting an envelope signal from a signal read out from a video tape and generating a second pulse signal having the same phase and period of time as the detected envelope signal, and a controller for generating a head switching signal whose pulse level is altered at an actual head switching point of time, based on the received first and second pulse signals. An accurate head switching signal can be generated even when a vertical sync signal is not detected from a video tape having a recording format for recording a vertical sync signal, as well as a recording format by which a vertical sync signal is not recorded on a video tape.

REFERENCES:
patent: 4752839 (1988-06-01), Lovely
patent: 5251079 (1993-10-01), Yamada et al.
patent: 5291342 (1994-03-01), Kim
patent: 5448367 (1995-09-01), Park et al.
patent: 5539589 (1996-07-01), Yamamoto
patent: 5663623 (1997-09-01), Seoung

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