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Fully digital spectrum analyzer using time compression and Discrete Fourier Transform techniques

  • US 3,984,669 A
  • Filed: 12/20/1974
  • Issued: 10/05/1976
  • Est. Priority Date: 05/14/1973
  • Status: Expired due to Term
First Claim
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1. A spectrum analyzer comprising:

  • means for generating P successive sequences of digital words (where p = 1, 2, . . . , P), each sequence p representing the time history of an analog signal over a selected time interval;

    means for receiving said P sequences of digital words from the generating means and for forming a set of P power values Xk,p for each of K spectral lines (where k = 1, 2, 3, . . . , K), each power value Xk,p representing the power spectrum of the k-th spectral line for the p-th sequence of digital words; and

    means for receiving said K.sup.. P power values from the forming means and for averaging the P power values of each of the K spectral lines, comprising means for providing averaging signals representing the expression p-1 2b (aYk,p-1 + 2-b Xk,p), where Yk,p-1 represents the value of the term inside the parenthesis for the (p-1) sequence of digital words, (b) is defined by the relationship (2b-1 <

    p ≦

    2b), and (a) is 1/2 if (p-1 = 2b-1) and is 1 otherwise.

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