Filtering a read signal to attenuate secondary pulses caused by

Details Filtering a read signal to attenuate secondary pulses caused by Filtering a read signal to attenuate secondary pulses caused by

1994-04-04

1997-04-22

Kim, W. C.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 45, G11B 5035, G11B 509

Patent

active

056233779

ABSTRACT:
A filter for compensating discrete secondary pulse formations associated with a data stream of discrete main pulses produced from data read from magnetic media. The filter's impulse response comprises a center coefficient with side compensating coefficients for attenuating the secondary pulses when the input signal is convolved with the impulse response. The magnitude and delay of the compensation coefficients are programmable and are adaptively adjusted to optimize the impulse response for a given environment. In a traditional FIR embodiment, two delay lines are used to generate the two programmable delays between the center coefficient and side compensation coefficients. In the preferred embodiment, an IIR filter provides the two programmable delays using only one delay line thereby reducing the size and cost of the circuit. Also in the preferred embodiment, the data stream is interleaved into an even and odd data stream and processed in parallel by two filters in order to double the throughput. Further, the pre-cursor correcting portion of the filter can be disabled in order to avoid delaying the data stream while still canceling the post-cursor secondary pulses. The filter also comprises attenuation and adder means to match the coincident sample values in amplitude and add them to substantially eliminate the effect of the secondary pulses in the discrete data stream.

REFERENCES:
patent: 4789994 (1988-12-01), Randall et al.
patent: 4947408 (1990-08-01), Sadr et al.
patent: 5003555 (1991-03-01), Bergmans
patent: 5027369 (1991-06-01), Kuenast
patent: 5265125 (1993-11-01), Ohta
patent: 5307213 (1994-04-01), Nishiyama
patent: 5341249 (1994-08-01), Abbott et al.

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