Adjustable write equalization for tape drives

Details Adjustable write equalization for tape drives Adjustable write equalization for tape drives

1991-03-29

1993-10-19

Mis, David

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 46, 307265, G11B 2014, H03K 3017, H03K 506

Patent

active

052551300

ABSTRACT:
A write equalization circuit that includes a data encoder for producing a binary data signal wherein a 1 is represented by a transition at the start of a bit interval and a 0 is represented by no transition at the start of a bit interval, an equalization timing generator for generating a start signal indicative of the initial edges of equalization pulses for predetermined 0's in the binary data signal, and a multiple stage delay delay circuit having logic gates implemented in an integrated circuit and responsive to the start signal and a control word for providing equalization pulses of a substantially constant width, wherein the number of stages employed for delay is determined by the control word. Logic circuitry implemented in the same integrated circuit as the multiple stage delay circuit detects changes in the propagation delay characteristics of the logic gates of the multiple stage delay circuit, and a processor responsive to the logic circuitry adjusts the control word so as to maintain the width of the equalization pulses substantially constant. Also disclosed is a method for adjusting write equalization pulses in a tape drive to achieve a desired suppression in the read signal.

REFERENCES:
patent: 5166836 (1992-11-01), Choi
"Write equalization in high-linear-density magnetic recording," Schneider, IBM J. Res. Develop., vol. 29, No. 6, Nov. 1985, pp. 563-556.
"Write Equalization For Generalized (d,k) Codes," Schneider, IEEE Transactions On Magnetics, vol. 24, No. 6, pp. 2533-2535, 1988 (No Month).
"Serial Recorded Magnetic Tape Cartridge For Information Interchange", QIC-1350, Revision H, Quarter-Inch Cartridge Drive Standards, Inc., Aug. 21, 1990 (all pages).

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