# Spectrogram - How to divide signal ?

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RuiQi am 8 Apr. 2016
Kommentiert: Rab Nawaz am 14 Jan. 2023
Hello
I have a signal 120 seconds long with sampling frequency 1KHz. How do I compute the spectrogram with 120 time segments ? Each segment 1000 samples. The code below gives me t = 136 not 120
segments = 120;
windowsize = 1000;
nfft = 1000;
[S,F,T,P] = spectrogram(data,windowsize,segments,nfft,Fs);
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### Akzeptierte Antwort

Rick Rosson am 8 Apr. 2016
Bearbeitet: Rick Rosson am 8 Apr. 2016
The third input argument of spectrogram expects the number of samples to overlap each window, not the number of segments. Please try:
winSize = 1000;
overlap = 0;
fftSize = winSize;
[S,F,T,P] = spectrogram(data,winSize,overlap,fftSize,Fs);
It is common practice, however, to set the overlap to half of the window size:
overlap = floor(winSize/2);
but it is not required if you don't want it.
HTH.
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Rab Nawaz am 14 Jan. 2023
@Rick Rosson! Please let me know how can I get wavelet coefficients in the same manner i.e. by dividing the signal in 'N' number of segments and with or without overlap. Alternatively, is there any way to get wavelet coefficients from this spectrogram function.

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