Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1988-08-22
1991-01-08
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 68, G11B 1514, G11B 502
Patent
active
049841025
ABSTRACT:
The information signal recording apparatus of this invention is adapted to form a plurality of concentric recording tracks over a disc-shaped recording medium by recording information signals on the disc-shaped recording medium. This recording apparatus is arranged to first emphasize a predetermined high-band frequency component of an input information signal in accordance with the position of a recording track on such a recording medium on which the information signal is to be recorded, then implement angle modulation on the information signal, and subsequently record the angle-modulated information signal on the recording medium. Accordingly, it is possible to optimally record the information signals on the disc-shaped recording medium, anywhere from the outer circumference to the inner circumference, without involving any influence of noise. The information signal reproducing apparatus of this invention is adapted to reproduce information signals from such a disc-shaped recording medium over which a plurality of concentric recording tracks are formed. This reproducing apparatus is arranged to suppress a predetermined high-band frequency component of an information signal to be reproduced in accordance with the position of the recording track on the recording medium from which the information signal is to be reproduced. Accordingly, it is possible to optimally reproduce the information signals on the recording medium, anywhere from the outer circumference to the inner circumference, without involving any influence of noise.
REFERENCES:
patent: 2901737 (1959-08-01), Stovall, Jr.
patent: 4244008 (1981-01-01), Holt
patent: 4479152 (1984-10-01), Chi
patent: 4564869 (1986-01-01), Baumeister
patent: 4794469 (1988-12-01), Kaido et al.
Canney Vincent P.
Canon Kabushiki Kaisha
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