Hi,
I know about the difference between pylab.psd and mlab.psd, but in theory
the only difference between the returned values is:
pylab.psd = 10*log10(mlab.psd)
Except this is not true, there is noticeable difference:
pylab.psd = 23.4962 (all these pylab.psd values are read from graph)
10*log10(mlab.psd) = 17.2852
pylab.psd = 18.8973
10*log10(mlab.psd) = 12.8149
pylab.psd = 4.92
10*log10(mlab.psd) = -2.247
These all look suspiciously out by around 2pi, although by no means exact.
Any ideas?
code is:
pylab.psd(input, NFFT=512, Fs=sampleRate, window=blackman(512)) #graph
x,y = mlab.psd(input, NFFT=512, Fs=sampleRate, window=blackman(512)) #look
at x
···
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