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Signal demodulation method and apparatus

  • US 6,236,691 B1
  • Filed: 03/16/1999
  • Issued: 05/22/2001
  • Est. Priority Date: 03/16/1999
  • Status: Expired due to Term
First Claim
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1. Method for extracting component information waves from a combined information wave, said combined information wave comprising two or more component information waves of known and distinct frequencies and known wave forms and phases, said method comprising:

  • a) a step of determining an amplitude of the combined information wave at the mid-cycle zero crossing point of each of the component information waves;

    b) a step of generating amplitude equations, one of the amplitude equations corresponding to each of the mid-cycle zero crossing points, with the sum of the unknown amplitude coefficients of each of the non-zero component information waves, as adjusted by the phase factor for the corresponding component information wave, being equal to the measured amplitude of the combined information wave at the mid-cycle zero crossing point; and

    c) a step of solving the amplitude equations to determine the amplitude coefficients of each of the component information waves.

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