Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1989-04-19
1991-09-17
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
G11B 503
Patent
active
050500120
ABSTRACT:
A high-speed erasing apparatus for use in a magnetic recording/reproducing system for erasing a recorded signal on a magnetic tape traveling along a predetermined path. The erasing apparatus comprises a flying-erasing head mounted on a rotary cylinder of the system, a full-erasing head disposed at a preceding position of the flying-erasing head in a traveling direction of the tape, and an audio-erasing head provided at a succeeding position thereof in the traveling direction. Also included in the apparatus are a high-speed erase oscillating circuit for supplying the full-erasing head with an output having a frequency higher than N times of the upper limit of the audible range, a video-erase oscillating circuit for supplying the flying-erasing head with an output having a frequency higher than the upper limit of a video signal range, and an audio-erase oscillating circuit for supplying the audio-erasing head with an output having a frequency higher than the upper limit of the audible range. The oscillating circuits are driven so that, at the initial time, the recorded signal is erased by all of the erasing heads with the tape being transported at the industry standard traveling speed and the high-speed erase oscillating circuit is operated so as to, after elapse of a predetermined time, erase the recorded signal by only the full-erasing head with the tape being transported at N times of the industry standard traveling speed.
REFERENCES:
patent: 4527202 (1985-07-01), Ohta
patent: 4737865 (1988-04-01), Murakami et al.
patent: 4750060 (1988-06-01), Nakazawa et al.
Namiki Yasuomi
Nishiumi Hiroshi
Canney Vincent P.
Victor Company of Japan Ltd.
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