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Error correction and detection apparatus and method

  • US 4,979,174 A
  • Filed: 12/29/1988
  • Issued: 12/18/1990
  • Est. Priority Date: 12/29/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for receiving input digital data coded using a predetermined error correction code, said apparatus comprisingfirst means capable of correcting a first number of errors in the received data and capable of detecting errors in the received data at a first probability rate;

  • second means capable of correcting a second number of errors in the received data, which is greater than said first number of errors, and capable of detecting errors in the received data at a second probability rate less than said first probability rate;

    means for deriving an error signal from said received data; and

    control means for applying said received data to said first means, and subsequently in response to said error signal indicating a first predetermined number of corrected errors in said received data, which is less than or equal to said first number, thereafter applying said received data to said second means, and thereafter in response to a subsequent error signal indicating a second predetermined number of corrected errors in said received data, which is less than or equal to said second number and greater than said first number, thereafter again applying said received data to said first means.

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