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Optimal codes for digital magnetic recording

Optimal codes for digital magnetic recording

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© The Institution of Electronic and Radio Engineers
Published

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.

Inspec keywords: codes; magnetic recording

Other keywords: M2 codes; digital sum variation; zero modulation; Miller coding; coded data; NRZ coding; digital magnetic recording; Manchester coding; optimal channel coding; enhanced NRZ coding

Subjects: Codes; Storage on moving magnetic media

References

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      • J.C Mallinson . On recording head field theory. IEEE Trans. , 3 , 773 - 775
    2. 2)
      • 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.
    3. 3)
      • C.D. Cullum . (1972) Encoding and signal processing, Advances in Magnetic Recording.
    4. 4)
      • `Recorded Magnetic Tape for Information Interchange', A.N.S.I. Standard X 3.39, 1973, (1600 char/in, PE).
    5. 5)
      • A.L. Knoll . Spectrum analysis of digital magnetic recording waveforms. IEEE Trans. on Electronic Computers , 6 , 732 - 743
    6. 6)
      • `Recorded Magnetic Tape for Information Interchange', A.N.S.I. Standard X 3.22, 1973, (800 char/in, NRZI).
    7. 7)
      • A.M. Patel . Zero-modulation encoding in magnetic recording. IBMJ. Res. Dev. , 4 , 366 - 378
    8. 8)
      • `Recorded Magnetic Tape for Information Interchange', A.N.S.I. Standard X 3.54, , Proposed, (6250 char/in, group coded recording).
    9. 9)
      • R.G. Kiwimagi . Channel coding for digital recording. IEEE Trans. on Magnetics , 3 , 515 - 518
    10. 10)
      • 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.
    11. 11)
      • J.C. Mallinson , H.N. Bertram . Write processes in high density recording. IEEE Trans. , 3 , 329 - 331
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