Dynamic magnetic information storage or retrieval – General processing of a digital signal
Patent
1978-03-20
1980-03-25
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
G11B 509
Patent
active
041953185
ABSTRACT:
A digital magnetic recording system is disclosed that utilizes partial response signalling to achieve the Nyquist data pulse rate with minimum bandwidth. A. C. bias is introduced to linearize the magnetic medium which, inter alis, permits reliable multilevel (greater than 2) data storage without impairing data accessibility. Preferably Class IV partial response is utilized with one or more sinusoidal lobes in the data frequency spectrum. The basic binary data to be stored is converted to, for example, ternary and the ternary data is precoded. The precoded ternary data is recorded on the magnetic medium via an interleaved dipulse sequence having a spectral null slightly outside the data frequency band. A pilot tone is inserted at the spectral null for timing recovery and automatic gain control.
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"Application of Partial-response Channel Coding to Mag. Recording Systems"-Kobayashi et al., IBM J. Res. Dev. 7/70, "Tradeoffs among Binary Codes in Mag. Tape Cassettes"-Pastoriza, Computer Design/Jan. 76. _
Craig John W.
Melbye Hartvig E.
Perahia Avraham
Price Robert
Canney Vincent P.
Cooper Albert B.
Sperry Corporation
Terry Howard P.
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