Automatic head switching control method and apparatus for multi-

Details Automatic head switching control method and apparatus for multi- Automatic head switching control method and apparatus for multi-

1995-09-29

1997-10-07

Chin, Tommy P.

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

360 61, H04N 979

Patent

active

056756984

ABSTRACT:
An automatic head switching control method and apparatus in a multi-modal VCR for allowing automatic switching between a first and a second video modes (e.g., NTSC and PAL) without manual adjustment. The invention generates a head switching signal of which the head switching point of time of each head is shifted by delay data which is adapted for a first mode when the broadcast mode is the first mode. It also generates a head switching signal of which the head switching point of time of each head is shifted by corrected delay data obtained by correcting the delay data adapted for the first mode with an offset correction value when the broadcast mode is the second mode. As a result, there is no requirement for a manual adjustment and control time is shortened by maintaining the uniform velocity of the drum motor during automatic control.

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patent: 4466022 (1984-08-01), Ota
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patent: 4614980 (1986-09-01), Ninomiya et al.
patent: 4730222 (1988-03-01), Schauffele
patent: 5231548 (1993-07-01), Yamada et al.

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