[SciPy-User] Signal to noise ratio

josef.pktd@gmai... josef.pktd@gmai...
Wed Feb 24 08:33:12 CST 2010


On Wed, Feb 24, 2010 at 8:12 AM, Nils Wagner
<nwagner@iam.uni-stuttgart.de> wrote:
> Hi all,
>
> I have two questions concerning signal processing
>
> I have used scipy.stats.signaltonoise to compute the
> signal-to-noise ratio.
> The value is 0.0447.
> How can I judge it ?

It's just mean over standard deviation
http://en.wikipedia.org/wiki/Signal-to-noise_ratio#Statistical_definition

I never use it, but the interpretation will depend on what your
level/mean/expected_value means.

>
> How can I filter out high frequencies using scipy ?
> How can I eliminate noise from the signal ?

(I'm no help here) There are many prefabricated filters in
scipy.signal, but I only use lfilter.

Josef

>
> Nils
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