Hi Warren, thanks for this example! I am getting the following error: Library/Frameworks/Python.framework/Versions/6.0.0/lib/python2.6/site-packages/scipy/signal/filter_design.py:224: BadCoefficients: Badly conditionned filter coefficients (numerator): the results may be meaningless "results may be meaningless", BadCoefficients) For any attempt to filter a low-pass below 12 Hz in this example (so - I don't get the plot you got - instead I get a flat line on the bottom subplot). Do you (or anyone?) have any idea why that is? Cheers, Ariel On Wed, Feb 24, 2010 at 7:51 AM, Warren Weckesser < warren.weckesser@enthought.com> wrote:
Nils Wagner 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 ?
How can I filter out high frequencies using scipy ?
I posted an example low-pass filtering using 'butter' and 'lfilter' from scipy.signal here:
http://mail.scipy.org/pipermail/scipy-user/2010-January/024032.html
Warren
How can I eliminate noise from the signal ?
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-- Ariel Rokem Helen Wills Neuroscience Institute University of California, Berkeley http://argentum.ucbso.berkeley.edu/ariel