Magnetic recording and reproducing apparatus including a viterbi

Details Magnetic recording and reproducing apparatus including a viterbi Magnetic recording and reproducing apparatus including a viterbi

1995-09-18

2000-04-04

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 61, G11B 509, G11B 1512

Patent

active

060468734

ABSTRACT:
A magnetic recording and reproduction apparatus, includes a circuit for changing a reference amplitude value of a Viterbi detector. The circuit is used to record and reproduce data with the reference amplitude value displaced from a reference value, thereby measuring the data error rate. Displacement of the reference amplitude from a reference value increases the data error rate, and therefore the data error rate can be measured within a short time. A data error rate with the reference amplitude equal to a reference value is estimated from the data error rate measurement, thereby making it possible to evaluate the degree of accuracy of a magnetic recording and reproduction apparatus. The data error rate is measured with the reference amplitude of the Viterbi detector displaced from a reference value while changing the equalization coefficient value of a waveform equalizer, the cut-off frequency of a low-pass filter and the write precompensation amount of a write precompensation circuit. In this way, the effect of the reproduction channel parameter or the write precompensation amount on the degree of accuracy of the magnetic recording and reproduction apparatus is evaluated, and the optimum value of the reproduction channel parameter or the write precompensation amount can thus be determined.

REFERENCES:
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patent: 5422760 (1995-06-01), Abbott et al.
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patent: 5588011 (1996-12-01), Riggle
patent: 5761212 (1998-06-01), Foland et al.
IEEE Transactions on Magnetics, vol. 27, pp. 4358-4543. Nov., 1991, Coker et al.

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