Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1994-05-06
1995-09-12
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 46, G11B 5035, G11B 509
Patent
active
054502535
ABSTRACT:
The characteristic of a regenerative signal from a magnetic head 11 is compensated by a filter 14 serving as an equalizer. The regenerative signal thus compensated is then decoded at a decoder 15. An adaptive control unit 17 adjusts (modifies) the characteristic of the filter 14 on the basis of a decode error (residual) at the decoder 15 and an input to the filter 14. A servo control unit 18 sends a servo lock signal to the adaptive control unit 17 when a servo control operation at the time of reproduction is stabilized to start an automatic adjustment operation of the filter characteristic. Thus, it is possible to prevent in advance bad influence or effect on a compensating operation of the equalizer resulting from the fact that an adaptive adjustment operation of the filter characteristic might be carried out at the time when the servo control operation is unstable like at the time of building up of a reproducing operation.
REFERENCES:
IEEE Transactions on Magnetics vol. 35, No. 3, Aug. 1989 pp. 520-526, Kato et al., "An Adaptive Equalizer for R-Dat.".
IEEE Transactions On Magnetics vol. 35, No. 3, Aug. 1989, New York US pp. 520-526, XP0000065978 S Kato et al. `An Adaptive Equalizer For R-Dat` p. 521, left column, line 34-p. 522, left column, line 1 p. 523, left column, line 2-line 8 p. 523, left column, line 20-p. 524, right column, line 18.
SMPTE Journal vol. 97, No. 1, Jan. 1988, White Plains, NY US pp. 8-12, XP000001443 S. Mita et al. `Adaptive Equalization Techniques for Digital Video Recording Systems`.
Inoue Hajime
Seki Takahito
Takizawa Chihoko
Frommer William S.
Kim W. Chris
Psitos Aristotelis
Sinderbrand Alvin
Sony Corporation
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