Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1988-12-02
1990-03-06
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 65, G11B 1514
Patent
active
049071041
ABSTRACT:
A digital magnetic recording and reproducing device of rotatable magnetic head type includes a rotary drum, first and second recording and reproducing heads situated at opposite positions on the circumference of the rotary drum with opposite azimuth angles, and a third recording and reproducing head adjacent to the second recording and reproducing head, with an azimuth angle opposite to the azimuth angle of the adjacent second head. In the normal reproduction mode, the first and second heads are used, but in the long time reproduction mode, the second and third heads are used. However, the rotational speed of the rotary drum is the same in each mode, allowing for the use of one equalizer for reproducing the signal for both the normal reproduction mode and long time reproduction mode.
REFERENCES:
patent: 4197562 (1980-04-01), Kikuya et al.
patent: 4396954 (1983-08-01), Sonoda et al.
patent: 4426666 (1984-01-01), Kobayashi et al.
patent: 4771345 (1988-08-01), Watanabe
patent: 4796103 (1989-01-01), Tokuyama
Video Tape Recorders, 2d Ed. by Harry Kybett, Howard W. Sams & Co., Inc., Indianapolis, Indiana, 1978, pp. 22-23.
Canney Vincent P.
Sharp Kabushiki Kaisha
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