Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1993-11-19
1997-09-02
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
386113, G11B 5035
Patent
active
056638442
ABSTRACT:
A circuit is provided for emphasizing or suppressing both a frequency corresponding to an upper sideband and a frequency corresponding to a lower sideband with respect to a frequency corresponding to the carrier of a frequency-modulated signal in equalizing the frequency-modulated signal reproduced from the recording medium. With this arrangement, it is possible to effectively compensate for the nonlinearity of a magnetic recording and reproducing system even in the case of a wide deviation. Also, the envelope levels of the portions of a frequency-modulated signal which are formed by frequency-modulating portions of a signal whose levels differ from each other, are extracted to adjust the equalizing characteristics of the equalizing circuit in accordance with the difference between the levels, whereby variations in the characteristics of a reproduction equalizing circuit due to variations with time can be appropriately compensated for.
REFERENCES:
patent: 3643013 (1972-02-01), Lemoine
patent: 4807056 (1989-02-01), Sasaki et al.
patent: 5105315 (1992-04-01), Bannai et al.
patent: 5124850 (1992-06-01), Kizu
patent: 5200835 (1993-04-01), Sakamoto
patent: 5543974 (1996-08-01), Sugita
"Introduction to Circuit Synthesis and Design" by Temes and LaPatna 1977, pp. 14-17.
"Signals and Systems" by Oppenheim, Willsky and Young p. 457 1983.
Gohda Makoto
Yamashita Shinichi
Canon Kabushiki Kaisha
Sniezek Andrew L.
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