Apparatus and method for automatically controlling adjustment of

Details Apparatus and method for automatically controlling adjustment of Apparatus and method for automatically controlling adjustment of

1992-06-18

1994-10-18

Shepperd, John

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

G11B 1514

Patent

active

053573820

ABSTRACT:
An apparatus and method for automatically controlling adjustment of a head switching point in a VCR allows for automatic adjustment of the head switching point instead of the conventional manual adjustment thereof. The adjustment can be performed during every tape playback routine, thereby providing stable image quality. According to the present invention, a drum pulse signal is amplified by an amplifier, delayed by a time constant of a delay monostable multivibrator and output as a head switching signal by a frequency generator. The microcomputer outputs control data to adjust a head switching point by adjusting the constant of the monostable multivibrator such that a desired head switching point is obtained. The control data from the microcomputer is converted by a digital/analog converter into an analog voltage signal for adjustment of the time constant of the delay monostable multivibrator, thereby enabling the desired adjustment of the head switching point.

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