文件列表:

DiscreteTFDs (0, 1999-08-10)
DiscreteTFDs\Changes (2522, 1999-07-08)
DiscreteTFDs\Chirplets (0, 1999-07-08)
DiscreteTFDs\Chirplets\angle2cr.m (372, 1999-02-02)
DiscreteTFDs\Chirplets\best_chirplet.m (2879, 1999-07-08)
DiscreteTFDs\Chirplets\cr2angle.m (388, 1999-02-02)
DiscreteTFDs\Chirplets\crlb.m (526, 1999-02-02)
DiscreteTFDs\Chirplets\est_c.m (1594, 1999-05-07)
DiscreteTFDs\Chirplets\est_cd_global.m (1624, 1999-05-18)
DiscreteTFDs\Chirplets\est_d.m (1494, 1999-05-18)
DiscreteTFDs\Chirplets\est_tf.m (1566, 1999-05-18)
DiscreteTFDs\Chirplets\find_chirplets.m (2823, 1999-05-18)
DiscreteTFDs\Chirplets\fisher.m (1312, 1999-02-02)
DiscreteTFDs\Chirplets\f_chirp.m (402, 1999-05-18)
DiscreteTFDs\Chirplets\g_chirp.m (916, 1999-05-18)
DiscreteTFDs\Chirplets\hessian.m (2749, 1999-05-18)
DiscreteTFDs\Chirplets\KandQ.m (7959, 1999-02-02)
DiscreteTFDs\Contents.m (3847, 1999-07-08)
DiscreteTFDs\Copyright (987, 1999-02-02)
DiscreteTFDs\Demos (0, 1999-07-08)
DiscreteTFDs\Demos\demo_chirplets.m (2490, 1999-07-08)
DiscreteTFDs\Demos\demo_cohen.m (4711, 1999-05-18)
DiscreteTFDs\Demos\demo_localized.m (2804, 1999-04-20)
DiscreteTFDs\Demos\demo_ltvf.m (1262, 1999-05-18)
DiscreteTFDs\Demos\demo_tcd.m (2832, 1999-05-18)
DiscreteTFDs\Demos\demo_wigner4.m (3831, 1999-05-18)
DiscreteTFDs\DTFDPath.m (961, 1999-07-08)
DiscreteTFDs\GNU_GPL (15145, 1999-02-02)
DiscreteTFDs\Makefile (357, 1999-07-08)
DiscreteTFDs\Quartic (0, 1999-02-02)
DiscreteTFDs\Quartic\laf.m (944, 1999-02-02)
DiscreteTFDs\Quartic\localized.m (1799, 1999-02-02)
DiscreteTFDs\Quartic\lwigner.m (1473, 1999-02-02)
DiscreteTFDs\Quartic\tcd.m (1715, 1999-02-02)
DiscreteTFDs\Symplectic (0, 1999-07-08)
DiscreteTFDs\Symplectic\chirp2rot.m (605, 1999-04-27)
DiscreteTFDs\Symplectic\fracft.m (1743, 1999-05-18)
DiscreteTFDs\Symplectic\freq_shear.m (613, 1999-04-28)
DiscreteTFDs\Symplectic\scale.m (2592, 1999-04-28)
... ...

DiscreteTFDs Copyright (c) 1997, 19***, 1999 Jeffrey C. O'Neill (jeffo@bu.edu) Copyright (c) 19***, 1999 Boston University Copyright (c) 1997, 19*** L'Ecole Normale Superieure de Lyon Copyright (c) 1997 The Regents of the University of Michigan All Rights Reserved see DiscreteTFDs/Copyright This is a collection of Matlab files for time-frequency analysis. However, if you don't have Matlab, you can try Octave http://www.che.wisc.edu/octave/ or SciLab http://www-rocq.inria.fr/scilab/ These programs are either a result of my research or something that I found useful enough to spend the time to implement. Included are: a rigorous implementation of time-frequency distributions (Cohen class), some quartic time-frequency distributions, chirplet decomposition based on maximum likelihood estimation, fractional Fourier transform, time-varying filtering, and other useful little utilities. There isn't a manual, but you can find details in my papers http://mdsp.bu.edu/jeffo or you can send me an email jeffo@bu.edu The files are located in several sub-directories: Chirplets -- atomic decomposition based on maximum likelihood estimation Demos -- demonstrations to get you started Symplectic -- symplectic transformations (fractional Fourier transform) TypeI -- routines for computing type I TFDs (the Cohen class) TypeII -- routines for computing type II TFDs TypeIV -- routines for computing type IV TFDs Quartic -- some quartic functions from my research Utils -- some useful utilities You will need to add something like the follwing lines to your startup.m file (do not put a trailing '/' at the end of p!): p = '/home/jeffo/matlab/DiscreteTFDs'; path(path, p) DTFDPath(p) clear p If you are using a Macintosh or MS Windows, then you will need to edit DTFDPath.m to reflect your system path conventions. At the MATLAB prompt type "help DiscreteTFDs" for a list of available functions, and use "help" to get information on each function. For someone who knows very little about the area of TFDs and wants to experiment, I would recommend using binomial2, born_jordan2, and spec2 with window lengths ranging from 16 to 128. Jeff O'Neill

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