Improve concentration of frequency and time (ConceFT) by novel complex spherical designs

Matt Sourisseau, Yu Guang Wang, Robert S. Womersley, Hau Tieng Wu, Wei Hsuan Yu

Research output: Contribution to journalArticlepeer-review


Concentration of frequency and time (ConceFT) is a generalized multitaper algorithm introduced to analyze complicated non-stationary time series. To avoid the randomness in the original ConceFT algorithm, we apply the novel complex spherical design technique to standardize ConceFT, which we coin CQU-ConceFT. The proposed CQU-ConceFT is applied to visualize the spindle structure in the electroencephalogram signal during the N2 sleep stage and other physiological time series.

Original languageEnglish (US)
Pages (from-to)137-144
Number of pages8
JournalApplied and Computational Harmonic Analysis
StatePublished - Sep 2021


  • ConceFT
  • Multitaper
  • Quasi-uniform spherical design
  • Synchrosqueezing transform
  • Time-frequency analysis

ASJC Scopus subject areas

  • Applied Mathematics


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