Earlier studies have shown that nasalization affects the radiated spectrum by modifying the vocal tract transfer function in a complex manner.
Here we study this phenomenon by measuring sine-sweep response of 3-D models of the vowels /u, a, ᴂ, i/, derived from volumetric MR imaging, coupled by means of tubes of different lengths and diameters to a 3-D model of a nasal tract.
The coupling introduced a dip into the vocal tract transfer function. The dip frequency was close to the main resonance of the nasal tract, a result in agreement with the Fujimura & Lindqvist in vivo sweep tone measurements [Fujimura & Lindqvist, 1972]. With increasing size of the coupling tube the depth of the dip increased and the first formant peak either changed in frequency or was split by the dip. Only marginal effects were observed of the paranasal sinuses. For certain coupling tube sizes, the spectrum balance was changed, boosting the formant peaks in the 2 – 4 kHz range.
A velopharyngeal opening introduces a dip in the transfer function at the main resonance of the nasal tract. Its depth increases with the area of the opening and its frequency rises in some vowels.
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- The relation of nasality and nasalance to nasal port area based on a computational model.Cleft Palate Craniofac .J. 2012; 49: 741-749https://doi.org/10.1597/11-131
- The nasal cavity structures.STL-QPSR. 1964; 5: 5-7
- Acoustic properties of the nasal tract.Phonetica. 1976; 33: 161-168
- Acoustic characteristics of the human paranasal sinuses derived from transmission characteristic measurement and morphological observation.J. Acoust. Soc. Am. 1996; 100: 3376-3393
- Resonator properties of paranasal sinuses: preliminary results of an anatomical study.Rhinology 2014. 2014; 52: 178-182
- Acoustic Theory of Speech Production.1960 (Mouton, The Hague, Netherlands)
- Analog studies of the nasalization of vowels.J. Speech Hear Disord. 1956; 21: 218-232
- Sweep tone measurements of vocal tract characteristics.J. Acoust. Soc. Am. 1971; 49: 541-558
- Vocal tract sweeptone data and model simulations of vowels, laterals and nasals.STL-QPSR. 1993; 34: 43-76
- Velum behavior in professional classic operatic singing.J Voice. 2002; 16: 61-71
- Movement of the Velum during speech and classically trained singers.J Voice. 1997; : 212-221
- Spectrum effects of a velopharyngeal opening in singing.Journal of Voice. 2020; 34: 346-351
M. Echternach, C. Högerle, M. Köberlein, et al. The effect of nasalance on vocal fold oscillation patterns during the male passaggio, J. Voice (ePub ahead of print)
- Effects of functional endoscopic sinus surgery on the acoustics of the sinonasal tract.Rhinology. 2017; 55: 81-89
- Resonatory properties in professional tenors singing above the passaggio.Acta Acustica united with Acustica. 2016; 137: 198-306
- Articulation and vocal tract acoustics at soprano subject`s high fundamental frequencies.J Acoust Soc Am. 2015; 137: 2586-2596
- A comparison of different methods to generate tooth surface models without applying ionizing radiation for digital three-dimensional image fusion with mri based data of the head and neck region.J Comput Assist Tomogr. 2015; 39: 882-889
- Vocal tract wall effects, losses, and resonance bandwidths.STL-QPSR. 1972; 13: 28-52
- Eliminating paranasal sinus resonance and its effects on acoustic properties of the nasal tract.Logopedics Phoniatrics Vocology. 2016; 2016: 33-40
- Some acoustic features of nasal and nasalized vowels: a target for vowel nasalization.J. Acoust. Soc. Am. 1996; 99: 3694-3706
- Simulation and analysis of nasalized vowels based on magnetic resonance imaging data.J. Acoust. Soc. Am. 2007; 121: 3858-3873
- The impact of nasalance on cepstral peak prominence and harmonics-to-noise ratio.The Laryngoscope. 2018; 129: E 299-304
Published online: March 24, 2021
Accepted: February 2, 2021
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