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Apparatus for measuring the period and frequency of a signal

  • US 4,037,151 A
  • Filed: 02/27/1976
  • Issued: 07/19/1977
  • Est. Priority Date: 02/27/1976
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring the period and frequency of a substantially periodic input signal waveform having random components by cross-correlating the input signal waveform with a reference waveform that is modified by the input signal waveform, said apparatus comprising:

  • first memory means disposed to receive the input signal waveform to be measured and to store selected sections of said input signal waveform.second memory means coupled to said first memory means for storing a section of the reference waveform;

    cross-correlator means coupled to said first and second memory means for repeatedly cross-correlating sections of the stored input signal waveform with said section of the stored reference waveform to produce a cross-correlation waveform;

    peak-detector means coupled to said cross-correlator means for measuring the occurrence in time of relevant peaks of the cross-correlation waveform and producing an output signal indicative of such occurrences;

    processing means coupled to receive the output signal of said peak detector means for deriving the period and frequency of said input signal waveform from said output signal; and

    updating means coupled to said first and second memory means and to said peak detector means for periodically modifying the contents of the second memory means in accordance with sections of the input signal waveform stored in the first memory means.

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