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Matlab时频分析工具箱,希望能对大家有所帮助啊

% LTFAT - Basic Fourier and DCT analysis.
%
%  Peter L. Soendergaard, 2008.
%
%  Basic Fourier analysis
%    DFT            -  Unitary discrete Fourier transform.
%    IDFT           -  Inverse of DFT.
%    INVOLUTE       -  Involution.
%    PCONV          -  Periodic convolution.
%    HERMBASIS      -  Orthonormal basis of Hermite functions.
%    ISEVEN         -  Test if function is even centered
%    MIDDLEPAD      -  Cut or extend even function.
%
%  Approximation of continous functions
%    FFTRESAMPLE    -  Fourier interpolation.
%    DCTRESAMPLE    -  Cosine interpolation.
%    PDERIV         -  Derivative of periodic function.
%
%  Cosine and Sine transforms.
%    DCTI           -  Discrete cosine transform type I
%    DCTII          -  Discrete cosine transform type II
%    DCTIII         -  Discrete cosine transform type III
%    DCTIV          -  Discrete cosine transform type IV
%    DSTI           -  Discrete sine transform type I
%    DSTII          -  Discrete sine transform type II
%    DSTIII         -  Discrete sine transform type III
%    DSTIV          -  Discrete sine transform type IV
%
%  For help, errors, suggestions etc. please send email to

% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% 
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
% 
% You should have received a copy of the GNU General Public License
% along with this program.  If not, see <http://www.gnu.org/licenses/>.
%  [e-mail].