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Encoding and decoding system for electronic data communication system

  • US 4,817,115 A
  • Filed: 02/27/1987
  • Issued: 03/28/1989
  • Est. Priority Date: 02/27/1987
  • Status: Expired due to Term
First Claim
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1. An electronic data communication system wherein data characteristics are transmitted as analog signals comprising:

  • converting means for converting each data character into a unique multi-bit binary value consisting of a preselected total number of bits including both logic one bits and logic zero bits, of which bits a predetermined number are logic one bits, each unique multi-bit binary value being formed of the same preselected total number of bits of which the same predetermined number of bits are logic one bits, such that the maximum number of characters which may be converted into unique multi-bit binary values is equal to the total possible number of unique sequences of logic one bits and logic zero bits which may be formed from the preselected total number of bits with the predetermined number of logic one bits;

    pulse generating means for generating a unique pulse form which is an analog signal corresponding to each of said unique multi-bit binary values, each of said unique pulse forms consisting of a combination of wide pulses and narrow pulses, said pulse generating means generating a wide pulse for each logic one bit of said unique multi-bit binary value, and generating a narrow pulse for each logic zero bit of said unique multi-bit binary value, said pulses in each of said unique pulse forms having alternating positive and negative values; and

    means for transmitting said analog signals which represent the data characters.

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