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Recording apparatus

  • US 5,216,712 A
  • Filed: 12/24/1991
  • Issued: 06/01/1993
  • Est. Priority Date: 12/27/1990
  • Status: Expired due to Fees
First Claim
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1. A recording apparatus for recording digital data, comprising:

  • means for orthogonally transforming a time axis of the digital data to a frequency axis on a block-by-block basis producing digital orthogonally transformed data;

    means for converting the digital orthogonally transformed data to digital recording data; and

    means for causing the converting means to convert the digital orthogonally transformed data to digital recording data which substantially cannot be restored to the original digital data.

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