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Wired spread spectrum data communication system

  • US 4,475,208 A
  • Filed: 01/18/1982
  • Issued: 10/02/1984
  • Est. Priority Date: 01/18/1982
  • Status: Expired due to Fees
First Claim
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1. A method for communication of a data signal over a low to medium frequency response and bandwidth transmission line having at times a line signal thereon substantially without interference to or by said line signal, said data signal and said line signal occupying substantially the same frequency band, said method comprising the steps of:

  • (a) spread spectrum encoding a data signal by combining same with a pseudo-noise (PN) code signal;

    (b) coupling said encoded data signal to said line for transmission thereon;

    (c) adjusting the level of said encoded data signal to a selected level below the level of said line signal when present; and

    (d) decoding said encoded data signal as adjusted by removing said PN code signal therefrom to provide said data signal.

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