Signal processing system having intersymbol-interference cancell

Details Signal processing system having intersymbol-interference cancell Signal processing system having intersymbol-interference cancell

1993-08-06

1994-08-30

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 32, G11B 500, G11B 509

Patent

active

053433351

ABSTRACT:
A reproduction equalizer including a linear equalizer for linearly equalizing a source signal read from a recording medium, a nonlinear cancellation means for cancelling intersymbol-interference (ISI) contained in the reproduction signal, a decoder for decoding the ISI free signal to reproduce a digital signal prior to storing into the recording medium and means for automatically calculating and/or updating the ISI data held in the nonlinear cancellation means on the basis for the equalized source signal for each address defined by the reproduced digital signal. The nonlinear cancellation means includes a lookup table storing the ISI data, a circuit for generating an address for reading out the ISI data from the lookup table, and a circuit for subtracting the ISI data read out from the lookup table from the equalized source signal. At an initial stage, the calculation means calculates the ISI data, and in a normal operation mode, the calculated ISI data is used.

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