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Total video to watch in this module: 15 minutes

The source of sound is either periodic (for voiced sounds) or random noise (for unvoiced sounds). Our model will make some dramatic simplifications, but they will be good enough for our purposes.
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The vocal tract is a tube, and it's easy to build a mathematical model of a tube. Again, a simplified model will be good enough here.
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The sound source is filtered by the tube, and produces speech. We have a complete model of speech production that we can use from now on.
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