Adaptive equalization circuit for magnetic recording apparatus h

Details Adaptive equalization circuit for magnetic recording apparatus h Adaptive equalization circuit for magnetic recording apparatus h

1992-10-16

1995-05-09

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

375232, G11B 535, H03H 730, H03H 740, H03K 5159

Patent

active

054145716

ABSTRACT:
A data reproducing circuit having a magnetic head for reading data from a recording medium, an adaptive equalization circuit for optimizing the waveform of a read signal, a discriminator circuit for discriminating an output signal of the adaptive equalization circuit and outputting a discriminated signal to an upper stage circuit, a format detecting circuit for detecting a pattern of signals written on the recording medium from outputs of the magnetic head, an expected value generating circuit for generating an expected value of the waveform of the read signal in accordance with an output of the adaptive equalization circuit and an output of the discriminator circuit, and an error detecting circuit for generating an error signal representing a difference between an output of the adaptive equalization circuit and an output of the expected value generating circuit. In the data reproducing circuit, the adaptive equalization characteristic of the adaptive equalization circuit is changed when a particular signal pattern on the recording medium is detected, allowing the adaptive equalization operation suitable for the recording medium.

REFERENCES:
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patent: 4712221 (1987-12-01), Pearce et al.
patent: 5060088 (1991-10-01), Dolivo et al.

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