[SciPy-user] Frequency content of a transient signal

Matthieu Brucher matthieu.brucher@gmail....
Tue Jul 22 07:43:19 CDT 2008


2008/7/22 Stéfan van der Walt <stefan@sun.ac.za>:
> 2008/7/22 Matthieu Brucher <matthieu.brucher@gmail.com>:
>> I think you can use a sliding DFT on your signal. This way, you will
>> get a moving estimation of the spectral information (it's a basic
>> time-frequency transform, before you use wavelets ;)).
>
> Wavelets always sound like so much fun.  Attached, a script to
> decompose the signal using pywt (http://wavelets.scipy.org).
>
> Regards
> Stéfan

What is great with the PSD (estimation of the spectral density) is
that it shows the spectral density. Wavelet are more complex than the
PSD.
Let's just say that what a wavelet transform does on a signal will
generally never be a spectral density (IIRC).

Matthieu
-- 
French PhD student
Website : http://matthieu-brucher.developpez.com/
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