Digital recording apparatus with disparity reducing encoder

Details Digital recording apparatus with disparity reducing encoder Digital recording apparatus with disparity reducing encoder

1983-10-18

1986-07-01

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

375 19, 340347DD, G11B 509, H03M 700

Patent

active

045983267

ABSTRACT:
Apparatus for use in recording digital words on magnetic tape without developing a net D.C. charge that would cause base line shift by use of a scheme of mapping of the words into code patterns from a larger number of bits and preselecting patterns which either have no D.C. weight or have a D.C. weight of .+-.4 or .+-.8 and in the latter two cases, providing alternate patterns for such words both with opposite sense to be used alternately to contract any charge buildup, the patterns also being selected to avoid frequency doubling.

REFERENCES:
patent: 4003042 (1977-01-01), van Duuren
patent: 4216460 (1980-08-01), Baldwin et al.
patent: 4310860 (1982-01-01), Leiner
patent: 4348659 (1982-09-01), Fugimori et al.
patent: 4358852 (1982-11-01), Ichikawa
patent: 4387364 (1983-06-01), Shirota
patent: 4394641 (1983-07-01), Ratigolas
patent: 4410877 (1983-10-01), Carasso et al.
patent: 4496934 (1985-01-01), Furukawa
patent: 4499454 (1985-02-01), Shimada
IBM-TDB-DC Balanced Encoded Recording, vol. 18, No. 1, Jun. 1975, Furtneg et al.

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