[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
Let's just say that what a wavelet transform does on a signal will
generally never be a spectral density (IIRC).

French PhD student
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