"Here are more samples of Speaker X, pronouncing the vowels [i a u] with both falling and rising intonation. In the spectrogram, we can see the individual harmonics falling and rising, while the overall resonance pattern for each vowel is relatively constant. When the harmonic rises or falls out of a formant band, it becomes inaudible, but in most cases another harmonic comes along to take its place."
http://www.fridaynightlinguistics.org/xoomei/
F0 = fundamental freq
F1 = jaw movement/aperture = height
F2 = tongue movement/advancement = frontness, backness
F1 & F2 dictates what is what.
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