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Time Frequency Toolbox

Toolbox developed for the analysis of non-stationary signals using time-frequency distributions.
(35 downloads for this version - 83355 downloads for all versions)
Details
Version
2.0.0
A more recent valid version with binaries for Scilab 6.0 exists: 2.0.2
Authors
Holger Nahrstaedt
François Auger
Owner Organization
TU Berlin / FG Regelungssysteme
Maintainers
Clement David
Steer Serge
Administrator Atoms
Holger Nahrstaedt
License
Creation Date
September 24, 2018
Source created on
Scilab 6.0.x
Binaries available on
This toolbox is in the process of being built
Description
            This Toolbox was ported from the Time-Frequency Toolbox http://tftb.nongnu.org/.


The toolbox contains numerous algorithms which implements various kind of
time-frequency analysis with a special emphasis on quadratic energy
distributions of the Cohen and affine classes, along with their version enhanced
by the reassignment method. The toolbox also includes signal generation
procedures, processing/post-processing routines (with display utilities) and a
number of demonstrations.

Here you will find some notes on time-frequency analysis: http://www.math.nmsu.edu/~jlakey/tfa_notes.html
(Take a look at Course notes, MATH 401/530, Chapter 3)


Changelog
---------------
2.0.0 - sci_gateways rewritten for Scilab-6 
         + parameter checking improved 
         + Ctfrxxx and tfrxxx functions made equivalent when 
           signal is a single vector. equivalence checked by
           Ctfrxxx unit_tests
         + Ctfrrsp and tfrrsp modified to work with rectangular 
           windows.
         + Ctfrbj, Ctfrbud where wrong when Nfreq==N and is odd
         + Chtl : the (1,1) element was not computed

  
      - Calling sequence of reassigned.c modified to add one 
         more argument (Threshold)
      - tfrgrd, the Scilab sinc function is sin(x)/x while the 
        stftb one used in Ctfrgrd was sin(%pi*x)/(%pi*x)

      -  triang, hamming, hanning, nutall, blackman, harris, 
          barthann, papoulis windows definition changed in 
          tftb_window and Cwindow according to the   
          en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows pages.
       - Kaiser ans Nutbess windows added in Cwindow.
       - Hanna window (whose definition was not found) has been 
         replaced by power of Sine window.
       - equivalence between tftb_window and Cwindow verified by Cwindow.tst
unit 
         test.

       - Matlab compatibility functions (mtlb_*) replaced by the 
         Scilab equivalents when possible
   
       - Help page examples verified and graphical outputs 
         included
       - misc bug fixes
   
1.2.4 - tests improved
      - small bugfixes
1.2.3 - plotting function is improved
      - rem is replaced by the internal scilab function modulo
      - mtlb_conv is replaced by conv
      - some bugfixes in the demos
      - 121 unit tests
      - the sci_gateway works under scilab 5.4

1.2.2 - Removing of memory leaks in sci_gateway (Thanks to Serge Steer)

1.2.1 - help structure is changed and Chapters are added

1.2 -  some bugs are removed
    -  sci_gateway added (Ctftb was ported to scilab)
    - new demos

1.1.1 - some bugs are removed
1.1 - some bugs are removed
    - tftb_window can be plotted 
    - frspec and frpowerspec added            
Files (1)
[4.08 MB]
Source code archive

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