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Method of ultrasonic data communication and apparatus for carrying out the method

  • US 4,045,767 A
  • Filed: 09/18/1973
  • Issued: 08/30/1977
  • Est. Priority Date: 09/20/1972
  • Status: Expired due to Term
First Claim
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1. An ultrasonic data communication system comprising:

  • first means for generating at least three respectively different ultrasonic frequency signals;

    second means, coupled to said first means, selectively encoding information to be transmitted in accordance with any selected one of the permutations of the possible sequences of the frequencies of said at least three respectively different ultrasonic frequency signals;

    third means, coupled to said first means and said second means, for transmitting a selected permutation of said frequency signals, all of the frequency components of which define the information to be transmitted, by transmitting each frequency signal in its encoded order in the selected permutation for a prescribed period of time;

    fourth means, for receiving the frequency signals transmitted by said third means;

    fifth means, coupled to said fourth means, for separating the respective frequency signals making up the selected permutation received by said fourth means;

    sixth means, coupled to said fifth means, for detecting the frequency components in said separated frequency signals, andseventh means, coupled to said sixth means, for decoding said information in accordance with the order in which said frequency components have been detected by said sixth means.

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