title: Pydub - How to change frame rate without changing playback speed
body: <p>I have a couple audio files that I open in Pydub with <code>AudioSegment</code>.   </p>
  
  <p>I want to decrease the audio quality from frame rate 22050 to 16000 Hz. (One channel files)    </p>
  
  <p>If I simply change the frame rate of AudioSegment, what I get is the exact same wave played in slower speed. Well, fair enough. </p>
  
  <p>But how do I actually change the waves to fit a lower quality, same speed playback?</p>
  
  <p>(Manual interpolation is the only thing I can think of, but I don't want to get into that trouble)</p>