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METHOD AND APPARATUS FOR EVALUATING REPETITIVELY TRANSMITTED SIGNALS

  • US 3,732,541 A
  • Filed: 04/26/1971
  • Issued: 05/08/1973
  • Est. Priority Date: 04/27/1970
  • Status: Expired due to Term
First Claim
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1. A method for evaluating data words transmitted several times from a transmitter to a receiver for the purposes of error correction or at least detection, comprising, at the receiver, the steps of:

  • transmitting a given word several times;

    subjecting the data word received during a first transmission to a parity test;

    storing such word;

    identifying a word having a parity error;

    subjecting such word received during a second transmission to a parity test;

    comparing the word received during the first transmission with the word received during the second transmission, replacing the stored word from the first transmission with the word received during the second transmission whenever the word received during the second transmission has proper parity;

    producing a difference indication when the word received during the first transmission differs from that received during the second transmission; and

    replacing the stored word with the word received during a third transmission only when such a difference indication is produced and when the word received during the third transmission has proper parity.

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