[SciPy-User] Signal to noise ratio

Ivo Maljevic ivo.maljevic@gmail....
Wed Mar 3 21:17:46 CST 2010


I just tried Warren's example and it works on Ubuntu.

Ivo

On 3 March 2010 21:20, Ariel Rokem <arokem@berkeley.edu> wrote:

> 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 ?
>> >
>> > Nils
>> > _______________________________________________
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>> > http://mail.scipy.org/mailman/listinfo/scipy-user
>> >
>>
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>
>
>
> --
> Ariel Rokem
> Helen Wills Neuroscience Institute
> University of California, Berkeley
> http://argentum.ucbso.berkeley.edu/ariel
>
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