Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
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.
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patent: 3760277 (1973-09-01), Whang
Digital Development Corporation
Siegemund Ralf H.
Sloyan Thomas J.
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