Recording and playback apparatus

Details Recording and playback apparatus Recording and playback apparatus

1974-07-24

1976-03-23

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Record editing

360 70, 360 73, H04N 578

Patent

active

039464350

ABSTRACT:
In a recording and playback apparatus the tachometer of the servo system for controlling the speed of the drive shaft uses a disc with a closed magnetizable track, which cooperates with an even number of equidistantly spaced magnetic heads connected to a direct voltage source in the playback mode. Each head successively magnetizes the track in an opposite sense. One of the heads scans the magnetizations stored in the track for supplying the input signal for the servo system during a recording. When a new recording is made which is to follow an existing recording, the magnetic heads are disconnected from the direct voltage source, and switching from the playback to the recording mode is effected by means of a switching device which can be controlled by the pulses scanned from a synchronization track on the record carrier.

REFERENCES:
patent: 3402257 (1968-09-01), Lange
patent: 3542949 (1970-11-01), Tanaka et al.
patent: 3600508 (1971-08-01), Dann et al.
patent: 3636252 (1972-01-01), Kowal
patent: 3654398 (1972-04-01), Louth
patent: 3666883 (1972-05-01), Yamo et al.
patent: 3671665 (1972-06-01), Kosaka
patent: 3686432 (1972-08-01), Deguchi et al.
patent: 3742132 (1973-06-01), Sanguu et al.
patent: 3772468 (1973-11-01), Tatsuguchi

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