Method and system for encoding and decoding digital data

Details Method and system for encoding and decoding digital data Method and system for encoding and decoding digital data

1974-12-27

1977-06-28

Sloyan, Thomas J.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

340347DD, G11B 509

Patent

active

040329798

ABSTRACT:
A digital data encoding and decoding method and system is disclosed, with particular reference to magnetic records, in which bits are encoded in groups. Three out of four, two-bit combinations are encoded respectively by three patterns of transition placements under the rule that the two-bit group frame be divisible in only three sections having width of the read resolution R and the minimum spacing M between transitions is twice that value. The fourth bit combination is encoded under utilization of altogether four bits, using pattern combinations that extend over six sections R under the same constraint as to minimum spacing. Under otherwise similar conditions, the package density can be increased by 33% as compared with tri-period codes, and more than doubled as compared with frequency doubling or Manchester. The encoding scheme is generalized in that the selective extension of the encoding field for bit groups permits pattern encoding by a smaller number of permissible pattern combinations than seemingly necessary on basis of fixed bit group lengths.

REFERENCES:
patent: 2807004 (1957-09-01), Pouliart et al.
patent: 3108261 (1963-10-01), Miller
patent: 3235855 (1966-02-01), Woo
patent: 3414894 (1968-12-01), Jacoby
patent: 3508228 (1970-04-01), Bishop
patent: 3631428 (1971-12-01), King
patent: 3641525 (1972-02-01), Milligan
patent: 3679977 (1972-07-01), Howson
patent: 3753255 (1973-08-01), DiVeto
patent: 3760277 (1973-09-01), Whang

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