Write equalization for partial response channels

Details Write equalization for partial response channels Write equalization for partial response channels

1995-11-29

1998-05-19

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375296, H04L 512

Patent

active

057545936

ABSTRACT:
A method of write equalization in digital data recording systems comprising the steps of: providing a digital data signal to be recorded on recordable media, wherein the digital data signal includes 1s and 0s spaced at time interval T with 1s represented by a signal transition between first and second signal levels and 0s represented by no signal transition, and in which there is a minimum of d+1 intervals T between transitions; providing write equalization pulses of width WT for each 0 starting with the (d+1)th 0 following a 1; and causing a transition of a write equalization pulse adjacent to a 1 to occupy the same position as the transition of the 1 so that there is no transition for the 1. In one embodiment, the initial transition of the first added 0 pulse following a 1 is advanced in time so that it occupies the same position as the transition for the 1. In a second embodiment, the second transition of the last added 0 pulse preceding a 1 is delayed in time so that it occupies the same transition as the transition for the 1.

REFERENCES:
patent: 5267096 (1993-11-01), Bachan et al.
patent: 5339202 (1994-08-01), Heinz et al.
patent: 5638226 (1997-06-01), Koren

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