Magnetic recording channel employing a non-ideal d.c.-free equal

Details Magnetic recording channel employing a non-ideal d.c.-free equal Magnetic recording channel employing a non-ideal d.c.-free equal

1992-12-11

1996-08-27

Hajec, Donald T.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 65, G11B 509

Patent

active

055506836

ABSTRACT:
A channel for magnetic recording systems that employs (1+D).sup.n PR equalization, omitting the (1-D) factor. PR2 ((1+D).sup.2) is the preferred embodiment of the present invention and PR1 (1+D) is also of interest. The signal is equalized for a pulse response that approximates the ideal pulse response, but has zero d.c. content. An equalizer having two classes of pulse response meeting these criteria are described, each suitable for use with different types of playback heads.

REFERENCES:
patent: 4081756 (1978-03-01), Price et al.
patent: 4675650 (1987-06-01), Coppersmith et al.
patent: 5166955 (1992-11-01), Ohta
patent: 5220466 (1993-06-01), Coker et al.
patent: 5233482 (1993-08-01), Galbraith et al.
Tyner et al., Equalizer Performance in a Magnetic Recording Channel with Asymmetric Response, IEEE, Nov. 1991.
Koren, (1+D).sup.w Partial Response Channel for UMR Heads, IEEE, Nov. 1993.
Kabal et al. "Partial Response Signaling", pp. 921-934, Sep. 1975.

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