I have a question on the pwelch method for power spectral density computation in Matlab that is not clarified in the documentation for pwelch.
My usage : pxx = pwelch(x, window, noverlap, nfft)
If nfft is larger than the length of window, I believe MATLAB pads each windowed segment with zeros so that the FFT is taken on nfft points. Please confirm.
What happens when nfft is smaller than the window length? Is the window size truncated to match nfft?
pwelch appears to scale the DFT here appropriately with number of samples of the nfft (N) and frequency spacing as opposed to a regular DFT in Matlab that is not scaled, pl confirm.
Is there a way to output the number of averages performed when pwelch is called as above?
Thanks.I have a question on the pwelch method for power spectral density computation in Matlab that is not clarified in the documentation for pwelch.
My usage : pxx = pwelch(x, window, noverlap, nfft)
If nfft is larger than the length of window, I believe MATLAB pads each windowed segment with zeros so that the FFT is taken on nfft points. Please confirm.
What happens when nfft is smaller than the window length? Is the window size truncated to match nfft?
pwelch appears to scale the DFT here appropriately with number of samples of the nfft (N) and frequency spacing as opposed to a regular DFT in Matlab that is not scaled, pl confirm.
Is there a way to output the number of averages performed when pwelch is called as above?
Thanks. I have a question on the pwelch method for power spectral density computation in Matlab that is not clarified in the documentation for pwelch.
My usage : pxx = pwelch(x, window, noverlap, nfft)
If nfft is larger than the length of window, I believe MATLAB pads each windowed segment with zeros so that the FFT is taken on nfft points. Please confirm.
What happens when nfft is smaller than the window length? Is the window size truncated to match nfft?
pwelch appears to scale the DFT here appropriately with number of samples of the nfft (N) and frequency spacing as opposed to a regular DFT in Matlab that is not scaled, pl confirm.
Is there a way to output the number of averages performed when pwelch is called as above?
Thanks. pwelch, psd, fft MATLAB Answers — New Questions

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