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DEMODULATING FREQUENCY SHIFT KEYING MODULATED INPUT SIGNAL

  • US 20160285658A1
  • Filed: 09/28/2015
  • Published: 09/29/2016
  • Est. Priority Date: 03/27/2015
  • Status: Active Grant
First Claim
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1. A method of demodulating a frequency shift keying (FSK) modulated input signal whose frequency varies between a first frequency and a second frequency, the method comprising:

  • providing first and second signals having a relative delay greater than a plurality of cycles of the lesser of the first and second frequencies;

    providing a succession of phase reference signals having respective incrementally greater phase delays relative to the first signal;

    providing samples of the phase reference signals at intervals determined by the second signal; and

    detecting a transition between the first and second frequencies when the relative values of the samples vary during a first plurality of intervals and then remain constant during a second plurality of intervals.

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