Hi all,
I have a question with respect to matlab's built-in function "bandpower".
The power of a certain signal can be calculated starting from a time-dependent signal, or from a PSD outcome.
In both cases, the result is the same:
t = 0:0.001:1-0.001;fs = 1000;x = cos(2*pi*100*t)+randn(size(t));p = bandpower(x)p = 1.4368[pxx,f] = periodogram(x,rectwin(length(x)),length(x),fs);p2 = bandpower(pxx,f,'psd')p2 = 1.4368
However, when adding a frequency range (since I am interested in the average power in a specific frequency range), the result is not the same with the two methods:
freqrange = [0,5];p = bandpower(x,fs,freqrange)p = 0.0122[pxx,f] = periodogram(x,rectwin(length(x)),length(x),fs);p2 = bandpower(pxx,f,freqrange,'psd')p2 = 0.0136
Any suggestion as to why these results are not equal would be greatly appreciated!
Best Answer