TFRSTFT Short time Fourier transform.
[TFR,T,F]=TFRSTFT(X,T,N,H,TRACE) computes the short-time Fourier
transform of a discrete-time signal X.
X : signal.
T : time instant(s) (default : 1:length(X)).
N : number of frequency bins (default : length(X)).
H : frequency smoothing window, H being normalized so as to
be of unit energy. (default : Hamming(N/4)).
TRACE : if nonzero, the progression of the algorithm is shown
(default : 0).
TFR : time-frequency decomposition (complex values). The
frequency axis is graduated from -0.5 to 0.5.
F : vector of normalized frequencies.
命令 help tfrstft
就出来了 |