Signal channel equalizer and method of making same

Details Signal channel equalizer and method of making same Signal channel equalizer and method of making same

1994-02-18

1995-06-13

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

G11B 5035

Patent

active

054248833

ABSTRACT:
In a magnetic playback system using an unshielded MR head and a d.c. free charge constrained recording code, the present invention discloses a playback equalizer and the method of making the equalizer whose response to an isolated pulse, unlike the narrow unidirectional pulse response known in the prior art, is a bidirectional signal having a steep zero crossing corresponding to the peak of an isolated pulse. The bidirectional signal is further characterized by skirts resulting from the excellent low frequency of the unshielded MR head, and, unlike the teaching of the prior art, these skirts overlap contiguous pulse periods without causing intersymbol interference. In combination with the characteristics of the patterns of the d.c. free charge constrained code, the presence of the skirts eliminates false zero crossings by maintaining the signal level above the system base line except at the time of a true signal crossing. This allows signal detection by means of a single zero crossing detection channel, and obviates the necessity for a second channel serving as an amplitude qualifier.

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Dovek et al. "Performance comparison of UMR and SMR heads for digital tape recording" Sep., 1992.
Signal Processing In Recording channels Utilizing Unshielded Magnetoresistive Heads, N. L. Koren, IEEE Trans. Magn, vol. MAG-26, No. 5, Sep. 1990, pp. 2166.
8/10 Modulation Codes for Digital Magnetic Recording, S. Fukuda et al, IEEE Magn., vol. Trans. MAG-22, No. 5, Sep. 1986.
Magnetic Recording Handbook, Nee and Daniel, McGraw-Hill Publishing Company, 1990, p. 1118-1119 and 1122-1123.

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