Synchrosqueezing-based recovery of instantaneous frequency from nonuniform samples

Gaurav Thakur, Hau Tieng Wu

Research output: Contribution to journalArticlepeer-review


We propose a new approach for studying the notion of the instantaneous frequency of a signal. We build on ideas from the Synchrosqueezing theory of Daubechies, Lu, andWu [Appl. Comput. Harmonic Anal., 30 (2010), pp. 243-261] and consider a variant of Synchrosqueezing, based on the short-time Fourier transform, to precisely define the instantaneous frequencies of a multicomponent AM-FM signal. We describe an algorithm to recover these instantaneous frequencies from the uniform or nonuniform samples of the signal and show that our method is robust to noise. We also consider an alternative approach based on the conventional, Hilbert transform-based notion of instantaneous frequency to compare to our new method. We use these methods on several test cases and apply our results to a signal analysis problem in electrocardiography.

Original languageEnglish (US)
Pages (from-to)2078-2095
Number of pages18
JournalSIAM Journal on Mathematical Analysis
Issue number5
StatePublished - 2011


  • AM-FM signals
  • Electrocardiography
  • Instantaneous frequency
  • Nonuniform sampling
  • Synchrosqueezing

ASJC Scopus subject areas

  • Analysis
  • Computational Mathematics
  • Applied Mathematics


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