Why 8 segments for pwelch?

5 ビュー (過去 30 日間)
Chinyere Williams
Chinyere Williams 2016 年 4 月 28 日
回答済み: Rick Rosson 2016 年 4 月 29 日
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

採用された回答

Rick Rosson
Rick Rosson 2016 年 4 月 29 日
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.

その他の回答 (0 件)

カテゴリ

Help Center および File ExchangeSpectral Estimation についてさらに検索

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by