On Wed, Jul 29, 2009 at 1:39 AM, 3togo<freet...@gmail.com> wrote:
>
> mlab.psd and pyplot.psd are different!!!!


The plotting command pyplot.psd scales the numbers in decibels (the dB
in the ylabel in pyplot.psd).  mlab.psd just returns the unscaled
power.   So in your example in subplot(3,1,3), call before plotting

  x = 10*np.log10(np.absolute(x))


JDH

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