The Instrument You Have Never Seen (Chapter 3)
from Between the Signs: The Speech Communication Podcast
Where the properties of a speech signal come from. Two ways of making a sound, one of them driven by a lovely piece of physics at the vocal folds, and the observation that whispering replaces the voiced source entirely without costing a single word — so the words apparently do not live in the source. Then the filter, where they do live: a tube of some seventeen centimetres whose plain acoustics predict the resonances we actually measure. The episode ends with the idea the rest of the lecture is built on, the source-filter model, and with the pleasing fact that the physical model of the vocal tract and the signal-processing model turn out to be the same thing. This episode was generated with artificial intelligence (NotebookLM) on the basis of the lecture script, and the voices are synthetic. In case of doubt, the lecture and the script are authoritative.
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