Rotational phase detecting apparatus for head drum utilizing vid

Details Rotational phase detecting apparatus for head drum utilizing vid Rotational phase detecting apparatus for head drum utilizing vid

1989-09-26

1992-06-02

Heinz, A. J.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 70, 360 75, G11B 1514, G11B 2102

Patent

active

051192454

ABSTRACT:
A rotational phase detecting apparatus for a head drum utilizing a video head capable of directly detecting the rotational phase of the head drum for the reproducing signal of the video head without using an additional pulse generating head by disposing a permanent magnet facing the rotational direction of video heads. When video heads pass by the permanent magnet, positive pulses are generated from the video heads and the positive pulse signal of the first video head is applied to a phase detecting signal processing unit via a rotary transformer and the positive pulse signal of the second video head is converted into a negative pulse signal at the rotary transformer and applied to a phase detecting signal processing unit.

REFERENCES:
patent: 4318142 (1982-03-01), Ravizza
patent: 4930025 (1990-05-01), Oberjatzas et al.

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