Pulse or digital communications – Equalizers – Automatic
Patent
1996-11-26
1999-10-19
Le, Amanda T.
Pulse or digital communications
Equalizers
Automatic
375232, 375233, 702319, 702323, H03H 730
Patent
active
059700912
ABSTRACT:
The object of the invention is to provide an equalizer capable of generating an equalized output compensated in the non-linearity of the signal reproduced by an MR head and a reliable high-density magnetically recorded-signal reproducer. An equalizer of an FIR-type filter structure comprises a plurality of delay elements for delaying input signals by a certain period, a plurality of coefficient processing units provided to input or output taps of the delay elements, and an adder for obtaining the sum of the outputs of the coefficient processing units, in which the distortion of the reproduced waveform can be corrected by a relatively simple circuit structure by comparing the signal value inputted to the coefficient processing unit from each tap with a predetermined threshold level and changing the signal value and a coefficient value to be multiplied in accordance with the comparison result. Therefore, any one of various existing signal processing systems can be applied to the decoding of reproduced signals of an MR head having the non-linear characteristic.
REFERENCES:
patent: 5398259 (1995-03-01), Tsujimoto
patent: 5418660 (1995-05-01), Sato et al.
patent: 5654765 (1997-08-01), Kim
Mita Seiichi
Nishida Yasutaka
Satoh Naoki
Watanabe Yoshiju
Hitachi , Ltd.
Le Amanda T.
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