SPCH 103 Lecture Notes - Lecture 8: Vocal Tract, Vocal Folds, Standing Wave
27 Apr 2020
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Source= vocal folds vibration resonant sounds like (ah), (m) Voiced glottal signal= periodic complex sound (several frequencies) [ah] periodic & voiced, with resonance: vocal tract is restricted. [v] periodic (f0) & voiced, aperiodic (noice) with no resonance. [l] periodic (f0) & voiced + anti resonance. Glottal signal is always the same vocal tract filtering function creates different speech sounds. Formula to calculate natural resonance frequencies of the vocal tract odd quarter wavelength. Fn= (2n-1)c/4l n=integer c= speed of sound (about 34,000 cm/sec0 l= length of the pipe (about 13cm for an adult woman) Formants= natural resonance frequencies of the vocal tract. Formants can change according to the length, and the shape (cross-sectional area) of the vocal tract. The first three formants are mainly perced as characterizing each vowel. The ratio between the formants is what is percived as characteristic of a certain vowel, not their absolute values. Articulatory and acoustic dimensions of production of speech sounds.
