title: Bandpass filter in python
body: <p>I'm trying to get a bandpass filter with a 128-point Hamming window with cutoff frequencies 0.7-4Hz in python. I get my samples for my signal from images. (1 sample = 1 image). The fps often changes. </p>
  
  <p>How can this be done in python? I read this: <a href="http://mpastell.com/2010/01/18/fir-with-scipy/" rel="nofollow">http://mpastell.com/2010/01/18/fir-with-scipy/</a> but I find firwin rather confusing. How can this be done with this variable fps?</p>