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Optimal codes for digital magnetic recording

Optimal codes for digital magnetic recording

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Channel coding is universally employed in digital magnetic recording to match certain properties of the coded data to the characteristics of the recorder channel. In this paper, attention is focused primarily on the digital sum variation and d.c. content of various codes. The older, more familiar examples, such as NRZ, Manchester, enhanced-NRZ and Miller are compared with the more recently developed group, zero modulation and M2 codes.

References

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      • R.G. Kiwimagi . Channel coding for digital recording. IEEE Trans. on Magnetics , 3 , 515 - 518
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      • A.L. Knoll . Spectrum analysis of digital magnetic recording waveforms. IEEE Trans. on Electronic Computers , 6 , 732 - 743
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      • J.C Mallinson . On recording head field theory. IEEE Trans. , 3 , 773 - 775
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      • J.C. Mallinson , H.N. Bertram . Write processes in high density recording. IEEE Trans. , 3 , 329 - 331
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      • A.M. Patel . Zero-modulation encoding in magnetic recording. IBMJ. Res. Dev. , 4 , 366 - 378
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      • `Recorded Magnetic Tape for Information Interchange', A.N.S.I. Standard X 3.22, 1973, (800 char/in, NRZI).
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      • `Recorded Magnetic Tape for Information Interchange', A.N.S.I. Standard X 3.39, 1973, (1600 char/in, PE).
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      • Wells, J.B.: `High density digital magnetic tape recording using enhanced-NRz coding', IERE Conference Proceedings No. 26., Conf. on Video and Data Recording, July 1973, p. 113–118.
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      • `Recorded Magnetic Tape for Information Interchange', A.N.S.I. Standard X 3.54, , Proposed, (6250 char/in, group coded recording).
    10. 10)
      • C.D. Cullum . (1972) Encoding and signal processing, Advances in Magnetic Recording.
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      • Spitzer, C.F., Jensen, T.A., Utschig, J.M.: `High bit-rate, high density magnetic tape recording', IERE Conference Proceedings No. 35., Conf. on Video and Data Recording, July 1976, p. 147–160.
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