at frequencies where the impedence is low (impedence is resistance to vibration at a given frequency). Formants occur, and are seen on spectrograms, around frequencies that correspond to the resonances of the vocal tract, i.e. periodic voice vibrations or aperiodic hissing) and the result of the filtering is the sound you can hear and record outside the lips and show on a spectrogram. The vocal tract filters a source sound (e.g. To understand why, you must recall the source-filter theory of speech production.
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