Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1997-10-27
1999-12-07
Young, W. R.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 65, G11B 5035, G11B 509
Patent
active
059993499
ABSTRACT:
A waveform equalization apparatus equalizes a digital information signal reproduced from a recording medium by multiplying the reproduced digital information signal and delayed signals thereof by tap coefficients, wherein each of the tap coefficients is adaptively controlled. An output signal of a transversal filter for each of a plural number of symbol data included in a digital information signal reproduced from a target track is compared with predetermined thresholds to obtain a plausible digital information signal. An amplitude difference between the output signal and the plausible digital information signal is calculated. Thereafter, the tap coefficients of each symbol data and the output signals of the plural number of symbol data are analyzed to provide a coefficient value status signal indicating whether the tap coefficients are converged or diverged and a data analysis result signal representing whether an eye pattern of the output signals is open or closed. Based on the coefficient value status signal and the data analysis result signal, predetermined initial tap coefficients, or new tap coefficients is selectively providing as the tap coefficients, wherein the new tap coefficients are obtained by using the amplitude difference, the reproduced digital information signal and the delayed signals thereof.
REFERENCES:
patent: 4789994 (1988-12-01), Randall et al.
patent: 4803438 (1989-02-01), Mizoguchi
patent: 5157690 (1992-10-01), Buttle
Daewoo Electronics Co. Ltd.
Neal Regina Y.
Young W. R.
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