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In general, the STFT window length is chosen to trade-off time
versus frequency resolution.
- For speech and singing voice, we desire:
- Harmonics are resolved
- Pitch and formant variations are closely followed
- Formants in speech are the low-frequency
resonances in the vocal tract. They appear as dark groups of
harmonics
- The first two formants largely determine the ``vowel'' in voiced
speech
- In telephone speech, nominally between 200 and 3200 Hz, only
three or four formants are usually present in the band
- Formant variation corresponds to vowel variation
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