Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1979-12-26
1982-11-02
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
375 23, G11B 509
Patent
active
043576346
ABSTRACT:
A method and apparatus for encoding and decoding digital information upon a recording medium using the time interval between adjacent pairs of pulses. A number "n" of unique time intervals between pulse pairs correspond to "n" unique symbols contained within a coding table. Assignment of the durations between pulses adapted to the frequency of occurrence of particular symbols within a data stream materially increases the efficiency of the method. Division of the data stream and numerical transformation of the data stream improve the efficiency of adaptive assignment of the durations between pulses on the basis of frequency of occurrence of particular symbols within a data stream. The method realizes a multiple-fold increase in data storage capacity of rotating magnetic disk memories over common MFM encoding, and the method similarly realizes a multiple-fold increase in data transfer rate for telecommunications applications.
REFERENCES:
patent: 3162857 (1964-12-01), Sanders
patent: 3209259 (1965-09-01), Huber
patent: 3281806 (1966-10-01), Lawrance et al.
patent: 3304542 (1967-02-01), Sutton et al.
patent: 4032979 (1977-06-01), Rice
Canney Vincent P.
Schatzel Thomas E.
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