title: Create a spectrogram in python (without drawing)
body: <p>I'm trying to create a spectrogram object for audio analysis.</p>
  
  <p>I'm using <a href="http://www.speech.kth.se/snack/man/snack2.2/python-man.html" rel="nofollow">Snack Library</a>. This library, create the spectrogram as a canvas object but I<br>
  should use the spectrogram as a numerical object (every 10 ms I should extract the vector of frequencies).</p>
  
  <p>This is the code of Snack Library:</p>
  
  <pre><code>c = tkSnack.SnackCanvas(root, height=400)
  c.pack()
  c.create_waveform(0, 0, sound=mysound, height=100, zerolevel=1)
  c.create_spectrogram(0, 150, sound=mysound, height=200)
  </code></pre>
  
  <p>I'm looking for tutorials online but I only found ways to draw the spectrogram.</p>
  
  <p>Thanks a lot!</p>