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Simultaneous transmission of two information signals within a band-limited communications channel

  • US 4,425,642 A
  • Filed: 01/08/1982
  • Issued: 01/10/1984
  • Est. Priority Date: 01/08/1982
  • Status: Expired due to Fees
First Claim
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1. A co-channel communications system for transmitting at least one digital data signal simultaneously with a communications medium signal comprising:

  • means for generating a plurality of spreading frequencies;

    means for combining the data signal and the plurality of spreading frequencies which causes each logic level of the data signal to be transmitted as a multifrequency signal consisting of a separate set of frequencies, each set being spread throughout the bandwidth of the communications medium channel, each of said multifrequency signals having a signal amplitude at a level which is substantially suppressed in relation to the magnitude of the communications medium signal at the signal to signal ratio which is at a non-interfering level and which is a function of the number of frequencies used for transmission of the data signal; and

    means for connecting the resulting multifrequency signal to the communications medium for simultaneous transmission with the communication medium signal.

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