Software for Time-Frequency Analysis

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Time-frequency representations of a bat echolocation chirp
Spectrogram (l), Wigner distribution (m), Optimal radially Gaussian kernel TFR (r)
horizontal axis: time (0-2.5ms), vertical axis: frequency (0-70kHz)

Background on optimal-kernel time-frequency analysis

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Matlab and C language programs for computing time-frequency representations (TFRs):

• Optimal Radially Gaussian Kernel TFR
  Batch oriented optimal-kernel TFR. Computes one optimal kernel for the entire signal. (Matlab)
   
• Adaptive Optimal-Kernel (AOK) TFR
  Online optimal-kernel TFR suitable for long signals with changing time-frequency characteristics. Adapts the kernel over time for improved performance. (Matlab-compatible C)
   
  PC/Mac compatible versions of the AOK software from Erik Winkler.
   
• Pseudo Affine Wigner Distributions
  A flexible class of time-scale covariant TFRs. Software is available as part of the Matlab time-frequency toolbox.
   
• Time-Frequency Toolbox
  A library of Matlab functions for time-frequency analysis.

Contributing Authors:

• Richard Baraniuk, DSP Group, Rice University
• Paulo Goncalves, INRIA, France
• Douglas Jones, Coordinated Science Lab, University of Illinois

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If you have found these TFRs useful and have a web site with examples you would like to have referenced here, send email to Richard Baraniuk.