This question already has an answer here:
- Why so many methods of computing PSD? 2 answers
I am trying to understand the difference between FFT magnitude and PSD (Power spectral density) with pwelch function of Matlab. In my example, Val1 and Val2 will output the same thing?
% N = 94144 % fs = 44100 segmentLength = N; % window size [pxx,f] = pwelch(signal,segmentLength,,segmentLength,fs); %pwelch(data,segmentLength,overlappedSamples,segmentLength,fs); Y = fft(signal); Y_mag = abs(Y); Val1 = 20*log10(Y_mag); Val2 = 10*log10(pxx);
PS: I have already seen the other posts and I understand very well the difference between PSD and FFT but here I am interested in the diffeeence in code. Thanks