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The discipline of acoustic phonetics can be narrowly defined as the study of the acoustic output of the vocal tract for speech, but ultimately it...

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Figure 1.Midsagittal schematic view of vocal folds (source) and vocal tract (filter, colored area).

From Encyclopedia article 'Acoustic phonetics'

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Figure 2.Production of output spectrum of the vocal tract. (a) Source spectrum produced by vibrating vocal folds. (b) Resonance curve (filter) of vocal-tract tube having uniform cross-sectional area. (c) Output spectrum from combined source and filter. (d) Output spectra for vowels “ee,”“uh,” and “ah.”

From Encyclopedia article 'Acoustic phonetics'

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Figure 3.Spectrogram of the utterance, “Tom Brooks was such a man.” Intensity is coded by the gray scale. The speech waveform (amplitude over time) is at the top of the plot. Letters beneath the plot show the approximate locations of the sounds. First three formants, F1, F2, and F3, are indicated for the vowel “uh” in “such.”

From Encyclopedia article 'Acoustic phonetics'

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