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Real-time hierarchal pyramid signal processing apparatus

  • US 4,674,125 A
  • Filed: 04/04/1984
  • Issued: 06/16/1987
  • Est. Priority Date: 06/27/1983
  • Status: Expired due to Term
First Claim
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1. Signal processing apparatus responsive to a given temporal signal that defines an information component having a frequency spectrum, said apparatus employing pipe-line architecture for analyzing in delayed real time the frequency spectrum of said information component of said given temporal signal, wherein said component corresponds to information having a given number of dimensions, and wherein said frequency spectrum includes a highest frequency of interest which is no greater than a frequency f0 ;

  • said apparatus comprising;

    a set of N ordinally arranged sampled-signal translation means (where N is a plural integer), each one of said translation means including first and second input terminals and first and second output terminals;

    said first input terminal of each one of said second to said Nth translation means of said set being coupled to said first output terminal of its immediately preceding one of said translation means of said set for forwarding a signal from each one of said translation means to its immediately following one of said translation means of said set;

    means for applying said given temporal signal to said first input terminal of the first translation means of said set; and

    means for applying a separate sampling frequency clock to the second input terminal of each one of said translation means of said set to derive a sample rate for respective signals derived at said first and second output terminals of that translation means equal to the sampling frequency of the clock applied thereto;

    wherein;

    each one of said translation means of said set exhibits for said information component a low-pass transfer function between its first input terminal and its first output terminal, said low-pass transfer function of each translation means of said set having a nominal cut-off frequency that is a direct function of the sampling frequency of the clock applied to the second input terminal of that one of said translation means of said set;

    the clock applied to the second input terminal of said first translation means of said set has a sampling frequency that (1) is twice f0, and (2) provides for said information component a nominal cut-off frequency for said low-pass transfer function of said first translation means of said set which is less than f0 ;

    the clock applied to the second input terminal of each one of said second to Nth translation means of said set has a sampling frequency that (a) is less than the clock frequency applied to the second input terminal of its immediately preceding one of the translation means of said set, (b) is at least equal to twice any frequency of the information component of the signal applied to its first input terminal, and (c) provides a nominal cut-off frequency for its low-pass transfer function which is less than that of its immediately preceding translation means of said set; and

    the information component of said signal derived at said second output terminal of each one of said translation means of said set corresponds to a subtractive difference between the information component of the signal applied to said first input terminal thereof and a direct function of the information component of the signal derived at the first output terminal thereof.

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