Ternary code magnetic recording system

Details Ternary code magnetic recording system Ternary code magnetic recording system

1994-08-26

1997-04-15

Kim, W. C.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 40, G11B 509

Patent

active

056215800

ABSTRACT:
A digital magnetic recording system comprises an input for a binary-encoded data signal comprising two symbols. The binary signal is converted, using a binary-to-ternary convolutional encoder, to a ternary signal comprising three symbols. The ternary signal is recorded onto a magnetic medium wherein two symbols are recorded using conventional saturation recording and a third symbol is recorded using a nonoriented state. The nonoriented state results from the application to the medium of a high-frequency oscillating magnetic flux. The recorded signal is subsequently reproduced and equalized. A Viterbi algorithm is used to convert the equalized signal back to the original binary signal which is then output from the system.

REFERENCES:
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R. Price, J.W. Craig, H.E. Melbye, and A. Perahia, "An Experimental, Multilevel, High Density Disk Recording System," IEEE Trans. Magn., vol. 14, No. 5, pp. 315-317, Sep. 1978.
G. V. Jacoby, "Ternary 3PM Magnetic Recording Code and System," IEEE Trans. Magn., vol. 17, No. 6, pp. 3326-3328, Nov. 1981.
C.S. Chi and K.A. Frey, "Directional CRA for Ternary Digital Recording," IEEE Trans. Magn. vol. 18, No. 6, pp. 1259-1261, Nov. 1982.
C.A. French, G.S. Dixon, and J.K. Wolf, "Results Involving (d,k) Constrained M-ary Codes," IEEE Trans. Magn., vol. 23, No. 5, pp. 3678-3680, Sep. 1987.
B.D. Trumpis, "Convolutional Coding For M-ary Channels," Dissertation at University of California, Los Angeles, 1975.

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