Measurement of sound-pressure distribution in replicas of the oral cavity

Motoki, Kunitoshi; Miki, Nobuhiro; Nagai, Nobuo

doi:10.1121/1.404430

Cited by 16 publications

(15 citation statements)

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“…The measured sound-pressure distributions in the replicas of the oral cavities suggest the existence of resonances in the transverse direction in the vocal-tracts [4]. As shown in Fig.…”

Section: Measurement Of Sound-pressure Distributionmentioning

confidence: 66%

Three-dimensional acoustic field in vocal-tract.

Motoki

2002

Acoust. Sci. & Tech.

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Recent developments in observation techniques such as magnetic resonance imaging allow us to obtain an accurate description of the vocal-tract shape. It is thus possible to perform analyses of the acoustic characteristics of three-dimensional vocal-tracts at higher frequencies where the assumption of plane wave propagation does not hold. Historical and conventional one-dimensional models of vocal-tracts are briefly described followed by recent knowledge of the acoustic characteristics of three-dimensional vocal-tracts.

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“…The measured sound-pressure distributions in the replicas of the oral cavities suggest the existence of resonances in the transverse direction in the vocal-tracts [4]. As shown in Fig.…”

Section: Measurement Of Sound-pressure Distributionmentioning

confidence: 66%

Three-dimensional acoustic field in vocal-tract.

Motoki

2002

Acoust. Sci. & Tech.

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“…An experimental setup inspired from the work of Motoki et al (1992) has been developed to measure the acoustic pressure inside and outside of the vocal tract replicas. A scheme of this setup is presented in Fig.…”

Section: B Experimental Setupmentioning

confidence: 99%

Effects of higher order propagation modes in vocal tract like geometries

Blandin

Arnela

Laboissière

et al. 2015

The Journal of the Acoustical Society of America

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In this paper, a multimodal theory accounting for higher order acoustical propagation modes is presented as an extension to the classical plane wave theory. This theoretical development is validated against experiments on vocal tract replicas, obtained using a 3D printer and finite element simulations. Simplified vocal tract geometries of increasing complexity are used to investigate the influence of some geometrical parameters on the acoustical properties of the vocal tract. It is shown that the higher order modes can produce additional resonances and anti-resonances and can also strongly affect the radiated sound. These effects appear to be dependent on the eccentricity and the cross-sectional shape of the geometries. Finally, the comparison between the simulations and the experiments points out the importance of taking visco-thermal losses into account to increase the accuracy of the resonance bandwidths prediction.

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“…From physiological considerations, Pelorson et al (1995) estimated the first cut-on frequency to lie within the range 5-10 kHz. This has been confirmed by experimental or numerical studies (Lu et al, 1993, Motoki et al, 1992. A n accurate description of higher modes propagation is found t o be particularly crucial when considering the radiation of speech at the lips (Pelorson et al, 1995).…”

Section: Theorysupporting

confidence: 52%

Vocal tract acoustics using the transmission line matrix (TLM) method

El‐Masri

Pelorson

Saguet

et al.

Proceeding of Fourth International Conference on Spoken Language Processing. ICSLP '96

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Most traditional theories of speech production are currently based on plane waves and on one-dimensional analysis. It i s however well-known that when the frequency of sound reaches a cut-on frequency, higher acoustical modes start to propagate and can become predominant. It is therefore important t o evaluate the effects of these higher modes, especially in order t o improve acoustical models of the vocal tract. This paper describes a new numerical method to study the propagation and the radiation of speech sounds, and to compute acoustic characteristics of the vocal tract. This method, named Transmission Line Matrix or Modelling (TLM), has been used for simulating electromagnetic wave propagation and is used here for the first time in acoustics. The TLM method provides time domain solutions in 2D and 3D spaces. The main advantage of this method is the simplicity of formulation and programming for a large range of applications. We first describe the principle on which the TLM method is based. The method as well as the boundary conditions used are validated using classical tests. A systematic study of higher order mode propagation and radiation is then presented. We focus on the influence of some critical parameters such as vocal tract width and location of the sound source. In particular, we show how, using TLM simulation, it is possible to derive modal reflection and transmission characteristics of the vocal tract. A typical example of simulation is presented and discussed.

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Measurement of sound-pressure distribution in replicas of the oral cavity

Cited by 16 publications

References 0 publications

Three-dimensional acoustic field in vocal-tract.

Three-dimensional acoustic field in vocal-tract.

Effects of higher order propagation modes in vocal tract like geometries

Vocal tract acoustics using the transmission line matrix (TLM) method

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