Data recording and reproducing apparatus using two orthogonal co

Details Data recording and reproducing apparatus using two orthogonal co Data recording and reproducing apparatus using two orthogonal co

1996-03-08

2000-07-18

Loomis, Paul

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 29, 360 41, G11B 509, G11B 502

Patent

active

060915560

ABSTRACT:
A data recording device such as a hard disk apparatus has an orthogonal coding circuit and a modulation circuit. The orthogonal coding circuit encodes recording data to be recorded to adjacent two tracks as two orthogonal code streams which are included in an Hadamard matrix. The modulation circuit outputs recording signals, which are obtained by modulating the code streams using the NRZI system, to a magnetic head. Reproduction signals read out from a magnetic disk by the magnetic head are decoded as recording data based upon given decoding rules according to the two code streams.

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