Estimation of minimum oral tract constriction area in sibilant fricatives from aerodynamic data

Fujiso, Yo; Nozaki, Kazunori; Hirtum, Annemie van

doi:10.1121/1.4922366

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…The turbulence levela tt he inlet of the replica wasl ess than 3% [13]. Experiments were conducted at aflow rate of 40 L•min −1 ,which corresponds to the subject'smedium flowrate of /s/ in three effort levels, soft, medium and loud [14]. The flowrate wasvaried from 35 to 45 L•min −1 while the subject sustained /s/ at the medium level.…”

Section: Measurement With Flowmentioning

confidence: 99%

Influence of the Lip Horn on Acoustic Pressure Distribution Pattern of Sibilant /s/

Yoshinaga¹,

Hirtum²,

Nozaki³

et al. 2018

Acta Acustica united with Acustica

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Influence of the lip horn on the acoustic pressure distribution of the sibilant /s/ wasexperimentally studied using avocal tract replica to which arectangular bafflewas added to represent ahuman face. The sound wasgenerated by asweep sound source (Frequency: 2-15 kHz)positioned at the inlet of the pharynx or by air flowing through the replica. The sound generated by the sweep source wasmeasured along twosemi-circles of radius 4cmevery 2 • (near-field)a nd radius 48 cm every 15 • (far-field), where as the sound generated by the floww as measured along semicircles of radius 10 cm every 2 • .From the normalized pressure distributions, it wasobserved that the lip horn enhances the pressure amplitude up to 15 dB at the center of the lips in both transverse and sagittal plane in the frequencyrange above 5kHz. The pressure distribution patterns measured with the acoustic source were similar to those measured with the flowsupply.This indicates that the pressure pattern of sibilant /s/ is affected by the vocal tract geometry rather than by the source characteristics.

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Section: Measurement With Flowmentioning

confidence: 99%

Influence of the Lip Horn on Acoustic Pressure Distribution Pattern of Sibilant /s/

Yoshinaga¹,

Hirtum²,

Nozaki³

et al. 2018

Acta Acustica united with Acustica

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show abstract

“…At the inlet of the vocal tract geometry, a uniform velocity was imposed to set the constant flow rate for each vocal tract. Since we could not measure the flow rate while the subjects were sustaining /s/ in the MRI machine, we used a general flow rate of /s/ 250 cm 3 /s [9]. Meanwhile, the flow rate of subject D was increased up to 300 cm 3 /s since the sound amplitude was too small to compare with other subjects.…”

Section: Computational Grids and Boundary Conditionsmentioning

confidence: 99%

Individual Differences of Airflow and Sound Generation in the Vocal Tract of Sibilant /s/

2019

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To clarify the individual differences of flow and sound characteristics of sibilant /s/, the large eddy simulation of compressible flow was applied to vocal tract geometries of five subjects pronouncing /s/. The vocal tract geometry was extracted by separately collecting images of digital dental casts and the vocal tract of /s/. The computational grids were constructed for each geometry, and flow and acoustic fields were predicted by the simulation. Results of the simulation showed that jet flow in the vocal tract was disturbed and fluctuated, and the sound source of /s/ was generated in different place for each subject. With an increment of the jet velocity, not only the overall sound amplitude but also the spectral mean was increased, indicating that the increment of the jet velocity contributes to the increase of amplitudes in a higher frequency range among different vocal tract geometries.

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“…Because the /s/ is dependent on dental anatomy, the success of dental procedures is often assessed by determining the quality of /s/ (cf. Fujiso, Nozaki, & Van Hirtum, 2015;Mehringer, 1963;Runte et al, 2001). Fujiso et al (2015) indicated that a speech screening tool to qualitatively assess dental procedures is best when using the fricative /s/, due to its reproducibility, consistent air flow, and intraoral pressure.…”

Section: Impact Of Palatal Features On Tongue Placementmentioning

confidence: 99%

“…Fujiso, Nozaki, & Van Hirtum, 2015;Mehringer, 1963;Runte et al, 2001). Fujiso et al (2015) indicated that a speech screening tool to qualitatively assess dental procedures is best when using the fricative /s/, due to its reproducibility, consistent air flow, and intraoral pressure. In addition to the alteration of /s/ by dental treatment, natural malocclusions and dental variability can also have an effect on speech.…”

Section: Impact Of Palatal Features On Tongue Placementmentioning

confidence: 99%

The Effects of Palate Features and Glossectomy Surgery on /s/ Production

Grimm

Stone

Woo

et al. 2017

J Speech Lang Hear Res

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For controls, hard palate height affected tongue height; a higher palate yielded a higher tongue. For patients, hard palate width affected tongue width; a narrower palate yielded a more anterior tongue. Tongue shape was unaffected by any palate features. Preference for /s/ showed an interaction effect between subject and palate height. Controls with high palates preferred a laminal /s/. All patients preferred a laminal /s/; glossectomy surgery may reduce tongue tip control.

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Estimation of minimum oral tract constriction area in sibilant fricatives from aerodynamic data

Abstract: International audienc

Cited by 8 publications

References 15 publications

Influence of the Lip Horn on Acoustic Pressure Distribution Pattern of Sibilant /s/

Influence of the Lip Horn on Acoustic Pressure Distribution Pattern of Sibilant /s/

Individual Differences of Airflow and Sound Generation in the Vocal Tract of Sibilant /s/

The Effects of Palate Features and Glossectomy Surgery on /s/ Production

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