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Ctfrbud

Butterworth time-frequency distribution.

Calling Sequence

[TFR,T,F]=Ctfrbud(X)
[TFR,T,F]=Ctfrbud(X,T)
[TFR,T,F]=Ctfrbud(X,T,N)
[TFR,T,F]=Ctfrbud(X,T,N,G)
[TFR,T,F]=Ctfrbud(X,T,N,G,H)
[TFR,T,F]=Ctfrbud(X,T,N,G,H,SIGMA)

Parameters

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/4)).

H :

frequency smoothing window(default : Hamming(N/4)).

SIGMA :

kernel width (default : 1).

TFR :

time-frequency representation

F :

vector of normalized frequencies.

Description

computes the Butterworth distribution of a signal X.

Examples

x = hilbert(sin(2*%pi*0.25*(1:128))+0.5*rand(1,128,'normal'));
g = Cwindow(9,'Hamming'); h=Cwindow(27,'Hamming');
t=1:128; [tfr,T,F]=Ctfrbud(x,t,128,g,h,3.6);
grayplot(T,F,tfr'); xlabel('time'); ylabel('frequency')

Authors

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