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FM Signal demodulator

  • US 4,574,247 A
  • Filed: 05/21/1984
  • Issued: 03/04/1986
  • Est. Priority Date: 05/21/1984
  • Status: Expired due to Fees
First Claim
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1. A method for demodulating an FM signal consisting of at least first and second discrete frequency components f0 and f1 representing data values and for deriving an output signal containing said data comprising the steps of:

  • sampling the FM signal periodically and at a rate higher than the rate of occurrence of said components;

    counting the number of excursions n of said signal during each sample time;

    comparing the sample counts n to a number N which is higher than the maximum number of f0 excursions which occur during a sample time and which is lower than the maximum number of f1 excursions which occur during a sample time; and

    generating an output having a first characteristic when n is less than N and a second characteristic when n is greater than N.

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