ctfrbj.m

Time-Frequency Toolbox,其中包含很常用的MATLAB程序

%CTFRBJ Born-Jordan time-frequency distribution.
% [TFR,T,F]=TFRBJ(X,T,N,G,H) 
% computes the Born-Jordan distribution of a signal X. 
% 
% X     = Analyzed signal.
% T     = time instant(s)          (default : 1:length(X)).
% N     = number of frequency bins (default : length(X)).
% G     = time smoothing window, (default : Hamming(N/10)). 
% H     = frequency smoothing window, (default : Hamming(N/4)). 
%
% TFR   = time-frequency representation. 
% F     = vector of normalized frequencies.
% 
% Example :
%   x = hilbert(sin(2*pi*0.25*(1:128))+0.5*randn(1,128));  
%   g = Cwindow(9,'Hamming'); h=Cwindow(27,'Hamming'); 
%   t=1:128; [tfr,T,F]=Ctfrbj(x,t,128,g,h);
%   imagesc(T,F,tfr); axis xy; xlabel('time'); ylabel('frequency')