Apparatus, having a variable equalizer, for reproducing a digita

Details Apparatus, having a variable equalizer, for reproducing a digita Apparatus, having a variable equalizer, for reproducing a digita

1994-11-21

1996-04-02

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

375230, G11B 5035, H03H 730

Patent

active

055046339

ABSTRACT:
An arrangement for reproducing a digital signal from a track on a record carrier includes a read head for reading the signal from the track, and a variable equalizer adapted to equalizer transmission characteristics of a transmission path, including a recording channel up to the variable equalizer, in response to first and second control signals. The first control signal (HF) has a relation with high frequency losses in a magnitude transmission characteristic of the transmission path, and the second control signal (PHI) has a relation with a difference in delay caused by the transmission path between low frequency signals and high frequency signal in an operating frequency range of the transmission path. The variable equalizer has a finite impulse response filter unit, which includes a delay line unit having a number of N taps, a multiplier unit for multiplying a signal present at the n-th tap of the delay line unit by a multiplication factor a(n) and for supplying the multiplier signal to a signal combiner. The variable equalizer also has a multiplication factor generator unit for generating the multiplication factors a(n) in response to the first and second control signals.

REFERENCES:
patent: 4615037 (1986-09-01), Adler
patent: 4888808 (1989-12-01), Ishikawa et al.
"Magnetic Recording", vol. II Computer Data Storage, By C. D. Mee and E. D. Daniel, pp. 215-224. 1988.

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