System having controlled polarity adding odd and/or even numbers

Details System having controlled polarity adding odd and/or even numbers System having controlled polarity adding odd and/or even numbers

1996-02-16

1997-06-10

Young, W. R.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 65, G11B 509, G11B 5035

Patent

active

056382260

ABSTRACT:
A controlled polarity recording channel capable of resolving a d+1 run-length, same-polarity data pattern. The system includes a modulation encoder, a write equalizer, a signal channel, a read equalizer, a detector, and a modulation decoder. The read equalizer may optionally include a decision feedback equalization circuit for restoring a d.c. component of an isolated pulse. The modulation encoder and decoder operate in a (d,k) run-length limited modulation code format. Also disclosed is a method for designing a read equalizer for resolving the d+1 run-length, same-polarity data pattern upon readback in controlled polarity systems.

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