离婚证样本（Matlab中filter函数用法）
很实用的时频分析工具箱，包括短时傅里叶正反变换等，很好，很强大哦~~分享给大家，包括以下函数的源代码：
% sigmerge - Add two signals with given energy ratio in dB.
% Choice of the Instantaneous Amplitude
% amexpo1s - Generate one-sided exponential amplitude modulation.
% amexpo2s - Generate bilateral exponential amplitude modulation.
% amgauss - Generate gaussian amplitude modulation.
% amrect - Generate rectangular amplitude modulation.
% amtriang - Generate triangular amplitude modulation.
% Choice of the Instantaneous Frequency
% fmconst - Signal with constant frequency modulation.
% fmhyp - Signal with hyperbolic frequency modulation.
% fmlin - Signal with linear frequency modulation.
% fmodany - Signal with arbitrary frequency modulation.
% fmpar - Signal with parabolic frequency modulation.
% fmpower - Signal with power-law frequency modulation.
% fmsin - Signal with sinusoidal frequency modulation.
% gdpower - Signal with a power-law group delay.
% Choice of Particular Signals
% altes - Altes signal in time domain.
% anaask - Amplitude Shift Keyed (ASK) signal.
% anabpsk - Binary Phase Shift Keyed (BPSK) signal.
% anafsk - Frequency Shift Keyed (FSK) signal.
% anapulse - Analytic projection of unit amplitude impulse signal.
% anaqpsk - Quaternary Phase Shift Keyed (QPSK) signal.
% anasing - Lipschitz singularity.
% anastep - Analytic projection of unit step signal.
% atoms - Linear combination of elementary Gaussian wave packets.
% dopnoise - Generate complex Doppler random signal.
% doppler - Generate complex Doppler signal.
% klauder - Klauder wavelet in time domain.
% mexhat - Mexican hat wavelet in time domain.
% tftb_window - Window generation (previously window.m).
% Addition of Noise
% noisecg - Analytic complex gaussian noise.
% noisecu - Analytic complex uniform noise.
% Modification
% scale - Scale signal using Mellin transform.
% Processing Files
% Time-Domain Processing
% ifestar2 - Instantaneous frequency estimation using AR2 modelisation.
% instfreq - Instantaneous frequency estimation.
% loctime - Time localization characteristics.
% Frequency-Domain Processing
% fmt - Fast Mellin transform
% ifmt - Inverse fast Mellin transform.
% locfreq - Frequency localization characteristics.
% sgrpdlay - Group delay estimation.
% Linear Time-Frequency Processing
% tfrgabor - Gabor representation.
% tfrstft - Short time Fourier transform.
% Bilinear Time-Frequency Processing in the Cohen's Class
% tfrbj - Born-Jordan distribution.
% tfrbud - Butterworth distribution.
% tfrcw - Choi-Williams distribution.
% tfrgrd - Generalized rectangular distribution.
% tfrmh - Margenau-Hill distribution.
% tfrmhs - Margenau-Hill-Spectrogram distribution.
% tfrmmce - MMCE combination of spectrograms.
% tfrpage - Page distribution.
% tfrpmh - Pseudo Margenau-Hill distribution.
% tfrppage - Pseudo Page distribution.
% tfrpwv - Pseudo Wigner-Ville distribution.
% tfrri - Rihaczek distribution.
% tfrridb - Reduced interference distribution (Bessel window).
% tfrridh - Reduced interference distribution (Hanning window).
% tfrridn - Reduced interference distribution (binomial window).
% tfrridt - Reduced interference distribution (triangular window).
% tfrsp - Spectrogram.
% tfrspwv - Smoothed Pseudo Wigner-Ville distribution.
% tfrwv - Wigner-Ville distribution.
% tfrzam - Zhao-Atlas-Marks distribution.
% Bilinear Time-Frequency Processing in the Affine Class
% tfrbert - Unitary Bertrand distribution.
% tfrdfla - D-Flandrin distribution.
% tfrscalo - Scalogram, for Morlet or Mexican hat wavelet.
% tfrspaw - Smoothed Pseudo Affine Wigner distributions.
% tfrunter - Unterberger distribution, active or passive form.
% Reassigned Time-Frequency Processing
% tfrrgab - Reassigned Gabor spectrogram.
% tfrrmsc - Reassigned Morlet Scalogram time-frequency distribution.
% tfrrpmh - Reassigned Pseudo Margenau-Hill distribution.
% tfrrppag - Reassigned Pseudo Page distribution.
% tfrrpwv - Reassigned Pseudo Wigner-Ville distribution.
% tfrrsp - Reassigned Spectrogram.
% tfrrspwv - Reassigned Smoothed Pseudo WV distribution.
% Ambiguity Functions
% ambifunb - Narrow band ambiguity function.
% ambifuwb - Wide band ambiguity function.
% Post-Processing or Help to the Interpretation
% friedman - Instantaneous frequency density.
% holder - Estimate the Holder exponent through an affine TFR.
% htl - Hough transform for detection of lines in images.
% margtfr - Marginals and energy of a time-frequency representation.
% midscomp - Mid-point construction used in the interference diagram.
% momftfr - Frequency moments of a time-frequency representation.
% momttfr - Time moments of a time-frequency representation.
% plotsid - Schematic interference diagram of FM signals.
% renyi - Measure Renyi information.
% ridges - Extraction of ridges.
% tfrideal - Ideal TFR for given frequency laws.
% Visualization & backup
% plotifl - Plot normalized instantaneous frequency laws.
% tfrqview - Quick visualization of time-frequency representations.
% tfrview - Visualization of time-frequency representations.
% tfrparam - Return the paramaters needed to display (or save) a TFR.
% tfrsave - Save the parameters of a time-frequency representation.
% disprog - Display progression of a loop.
% divider - Find dividers of integer such that product equals integer.
% dwindow - Derive a window.
% integ - Approximate integral.
% integ2d - Approximate 2-D integral.
% izak - Inverse Zak transform.
% istfr1 - returns true if a distribution is Cohen's class type 1 (spectrogram)
% istfr2 - returns true if a distribution is Cohen's class type 2 (Wigner-Ville)
% istfraff - returns true is a distribution is an affine class member
% kaytth - Kay-Tretter filter computation.
% modulo - Congruence of a vector.
% movcw4at - Four atoms rotating, analyzed by the Choi-Williams distribution.
% movpwdph - Influence of a phase-shift on the interferences of the pWVD.
% movpwjph - Influence of a jump of phase on the interferences of the pWVD.
% movsc2wv - Movie illustrating the passage from the scalogram to the WVD.
% movsp2wv - Movie illustrating the passage from the spectrogram to the WVD.
% movwv2at - Oscillating structure of the interferences of the WVD.
% odd - Round towards nearest odd value.
% sigmerge - Add two signals with given energy ratio in dB.
% zak - Zak transform.
% griffitc - Test signal example C of Griffiths' paper.
% lambdak - Evaluate lambda function for Affine Wigner distribution.
% umaxbert - Determination of the maximum value of u for Bertrand distribution.
% umaxdfla - Determination of the maximum value of u for D-Flandrin distribution.
% umaxunte - Determination of the maximum value of u for Unterberger distribution.
