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Recovery of data from amplitude modulated signals with self-coherent demodulation

  • US 5,563,550 A
  • Filed: 08/28/1995
  • Issued: 10/08/1996
  • Est. Priority Date: 08/28/1995
  • Status: Expired due to Term
First Claim
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1. A demodulation system for extracting information from an input amplitude-modulated signal having a maximum information-bearing angular frequency modulation component of ω

  • m(max) and a carrier frequency of ω

    c comprising,signal multiplying means comprising two input ports both of which are coupled to receive said input amplitude-modulated signal and wherein said signal multiplying means are constructed to provide an output signal which is the instantaneous square of said input amplitude-modulated signal,low-pass filter means coupled to receive said output signal and low-pass filter means is constructed to reject frequency components of at least 2ω

    c and higher in order to pass a filtered signal,DC power supply means,means for coupling a DC offset voltage from said DC power supply means to both of said inputs of said multiplying means for controlling the gain of said multiplying means, andmeans connected between said multiplying means and said low-pass filter means for blocking DC voltages from said low-pass filter means.

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