So I've decided to take July and think about the options, find a URL less than a thousand characters long, and so forth. The June solution is up on the solution page, for those of you who are panting to know what it was. A spectrogram represents that information visually. A pulse of the vocal folds produces a moment of high acoustic energy. These striations are darker at some frequencies than others, and over time these darker bits form time-varying bars called 'formants'.
Formant structure is a principal cue to vocal tract shape, and thus to articulatory configuration.
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