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Data encoding and decoding scheme

  • US 4,613,913 A
  • Filed: 09/05/1984
  • Issued: 09/23/1986
  • Est. Priority Date: 09/05/1984
  • Status: Expired due to Term
First Claim
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1. Apparatus for decoding digital data stored on a data storage medium, the digital data including a NRZ data word having groups of n data bits, each group being stored over n consecutive bit cells, respectively, and including a clock information bit stored between said groups at every n+1 bit cell, comprising:

  • (a) means for reading the digital data stored on the data storage medium and for producing an analog signal corresponding to the n data bits and the clock information bit, wherein the analog signal has positive and negative levels;

    (b) means for outputting the digital data in response to the analog signal, including(i) means for generating a reference signal tracking the average of the positive and negative levels of the analog signal; and

    (ii) means for comparing the analog signal with the reference signal and for generating output pulses upon transitions, respectively, of the analog signal going above or below the reference signal, the output pulses being the outputted digital data; and

    (c) means, responsive to the digital data being outputted, for producing data-ready pulses at a time corresponding to the bit cells storing the n data bits and for inhibiting the data-ready pulses at a time corresponding to the bit cell storing the clock information bit.

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