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Why 8 segments for pwelch?

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Chinyere Williams
Chinyere Williams il 28 Apr 2016
Risposto: Rick Rosson il 29 Apr 2016
Hi, If anyone could help me out i'd be very grateful. I'm using the pwelch function and I was just wondering why the default number of segments is 8? Is this when it is most effective, and if so, why? This is a general question for understanding
Thank you very much

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Rick Rosson
Rick Rosson il 29 Apr 2016
The use of 8 as the default value for the number of segments is purely arbitrary. It is a perfectly reasonable value, but it is no better or worse than any other choice. In general, you can often achieve better results by choosing a custom value for the window size and the overlap amount. Remember that there is a trade off between the window size and the frequency resolution. The larger the window, the smaller the frequency increment, and vice versa.
Please try:
nSegments = ... ;
winSize = signalLength/nSegments;
overlap = winSize/2;
fftSize = winSize;
figure;
pwelch(x,winSize,overlap,fftSize,Fs);
for a variety of values for nSegments.

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