Magnetic record/playback system of rotating head type

Details Magnetic record/playback system of rotating head type Magnetic record/playback system of rotating head type

1979-06-18

1981-12-15

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Record editing

360 38, 360 73, 360 77, H04N 5795, H04N 578, G11B 1546, G11B 2110

Patent

active

043062555

ABSTRACT:
A magnetic record/playback system of a rotating head type comprising switching device for switching the drive mode of a capstan motor to a low speed drive mode when the operation mode of the magnetic record/playback system is switched from a normal play mode to a still picture mode, level detecting device for producing a pulse in accordance with a period where a level of the envelope of a signal reproduced from the rotating head is below a predetermined level, signal supply for producing a logical product signal of the produced pulse and a head switching pulse of the rotating head, device for stopping the capstan being driven in the low speed drive mode in response to the logical product signal, and control device for controlling the detected level so that the width of the output pulse from the level detecting device is constant.

REFERENCES:
patent: 3557320 (1971-01-01), Hopf
patent: 3585291 (1971-06-01), Yamakawa
patent: 3943562 (1976-03-01), Opelt
patent: 4017895 (1977-04-01), Oprandi et al.
patent: 4127881 (1978-11-01), Wakami et al.
patent: 4143405 (1979-03-01), Kubota
patent: 4190869 (1980-02-01), Ota
Video Tape Recorders; Kybett; copyright 1974 by Howard Sams & Co., Inc., Indianapolis, pp. 144 and 146.

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