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US 7,460,627 B2Granted
Data reproduction device
AssigneeSanyo Electric Co., Ltd.
InventorOrimitsu Serizawa
Life of this patent
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Abstract
A data reproduction device for equalizing a reproduced digital signal. A signal reproduced using a reproduction head is sequentially processed by an analogue filter, an A/D, and an interpolator before being supplied to a digital equalizer. The digital equalizer digitally equalizes an input digital signal to output to a subsequent Viterbi decoder, or the like. The digital equalizer comprises a variable BPF, and a variable FIR filter, and the filtering characteristic is variably adjusted.
Claims7
A device for reproducing data, comprising:
- reproduction means for reproducing digital data;
- analogue-digital conversion means for converting an analogue signal sent from the reproduction means to a digital signal;
- and
- digital equalizing means for equalizing the digital signal sent from the analogue-digital conversion means so as to have a desired target characteristic,
- wherein the digital equalizing means has
- variable filtering means for adjusting an amplitude of the digital signal sent from the analogue-digital conversion means,
- variable group delay filtering means for adjusting a group delay of the digital signal sent from the variable filtering means, and
- variable FIR filtering means for compensating for a difference between characteristics of the digital signal sent from the variable group delay filtering means and the target characteristics,
- wherein the variable filtering means comprises
- fixed FIR filtering means for adjusting a high region amplitude of the digital signal sent from the digital-analogue conversion means,
- variable band-pass filtering means for adjusting a predetermined band amplitude of the digital signal sent from the fixed FIR filtering means, and
- variable high-pass filtering means for adjusting the high region amplitude of the digital signal sent from the variable band-pass filtering means.
9 more elements
Dependencies are inferred from the claim text.