FE Modeling of Human Vocal Tract Acoustics.&lt;BR&gt; Part II: Influence of Velopharyngeal Insufficiency on Phonation of Vowels

Vampola, Tomáš; Horáček, Jaromı́r; Vokářál, Jan; Černý, Libor

doi:10.3813/aaa.918052

Cited by 13 publications

(8 citation statements)

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“…This model of radiation losses wasu sed in Part II of the paper to simulate phonation in case of velopharingeal insufficiency, see [9].…”

Section: Acoustic Energy Losses In the Vocal Tractmentioning

confidence: 99%

“…The designed optimization procedure is demonstrated on an example in which the shape of the 3D model is tuned according to as et of prescribed acoustic eigenfrequencies (formants). The developed approaches and 3D FE models are then used in the Part II of this article for investigation of acoustic effects of velopharyngeal insufficiencyonphonation of vowels [9].…”

Section: Introductionmentioning

confidence: 99%

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FE Modeling of Human Vocal Tract Acoustics.<BR> Part I: Production of Czech Vowels

Vampola¹,

Horáček²,

Švec³

2008

Acta Acustica united with Acustica

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Finite element (FE) models open up newp ossibilities in simulating and understanding production of human voice and speech. This study presents FE models of the human vocal tract for the Czech vowels /a:/, /e:/, /i:/, /o:/, /u:/ which were created from magnetic resonance images of an adult male subject. The high number of elements in the FE models wasr educed by introducing acoustic superelements. An ovela lgorithm for parameterization of the FE models wasderivedtoallowmodifying and tuning the model shape according to prescribed acoustic characteristics (formants)o ft he vocal tract. The sound radiation losses at the lips and sound absorption at the vocal tract walls were taken into account. The frequencymodal characteristics of the three-dimensional (3D) and one-dimensional (1D) vocal tract models were compared. The results showed that the 1D models can closely replicate the behavior of the 3D vocal tract up to 3000 Hz. At higher frequencies transverse modes occurred in the 3D model which were not present in the 1D model. The developed FE models can be useful for studying the influence of vocal tract alterations (e.g. such as cleft palate or tonsillectomy)onacoustic voice quality.

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“…This model of radiation losses wasu sed in Part II of the paper to simulate phonation in case of velopharingeal insufficiency, see [9].…”

Section: Acoustic Energy Losses In the Vocal Tractmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FE Modeling of Human Vocal Tract Acoustics.<BR> Part I: Production of Czech Vowels

Vampola¹,

Horáček²,

Švec³

2008

Acta Acustica united with Acustica

Self Cite

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“…Though as said, impedance loads can be used to emulate radiation (e.g., Zhou et al, 2008;Vampola et al, 2008a;Vampola et al, 2008b), it seems more natural to extend the computational domain out of the vocal tract and to make use of infinite elements (e.g., Svancara and Hor aček, 2006;Vampola et al, 2011) or of perfectly matched layers (PML) (e.g., Takemoto et al, 2010;Arnela and Guasch, 2013), to allow waves emanating from the mouth to propagate toward infinity avoiding spurious reflections from the computational domain boundaries. This approach directly accounts for radiation effects and head details, though at a higher computational cost.…”

Section: Introductionmentioning

confidence: 99%

Effects of head geometry simplifications on acoustic radiation of vowel sounds based on time-domain finite-element simulations

Arnela

Guasch

Álías

2013

The Journal of the Acoustical Society of America

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One of the key effects to model in voice production is that of acoustic radiation of sound waves emanating from the mouth. The use of three-dimensional numerical simulations allows to naturally account for it, as well as to consider all geometrical head details, by extending the computational domain out of the vocal tract. Despite this advantage, many approximations to the head geometry are often performed for simplicity and impedance load models are still used as well to reduce the computational cost. In this work, the impact of some of these simplifications on radiation effects is examined for vowel production in the frequency range 0-10 kHz, by means of comparison with radiation from a realistic head. As a result, recommendations are given on their validity depending on whether high frequency energy (above 5 kHz) should be taken into account or not.

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“…The primary volume models of the human acoustic supraglottal spaces created from the MR images can then be transformed into the 3D finite element (FE) models [1]. Such models are helpful for modeling the real clinical situation, such as influence of various inborn defects in human supraglottal spaces on speech and voice or simulations of various postsurgical states in patients [2]. The quality of the developed FE models has to be checked by a sufficiently accurate numerical simulation of the subject phonation during the NMR scanning and therefore the simultaneous acoustic recording of subject voice during the scan procedure is very important [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Design, Realization and Experiments with a new RF Head Probe Coil for Human Vocal Tract Imaging in an NMR device

Přibil¹,

Gogola²,

Dermek³

et al. 2012

Measurement Science Review

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Magnetic resonance imaging (MRI) is nowadays widely used in medicine for diagnostic imaging and in research studies. The modeling of the human vocal tract acoustics has recently attracted considerable interest. This paper describes the design, realization and first MR scan experiments with a new head probe coil for vocal tract imaging in the open-air MRI equipment working in a weak magnetic field up to 0.2 T. The paper also describes an experimental setting for sound recording during the MR imaging.

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FE Modeling of Human Vocal Tract Acoustics.<BR> Part II: Influence of Velopharyngeal Insufficiency on Phonation of Vowels

Cited by 13 publications

References 0 publications

FE Modeling of Human Vocal Tract Acoustics.<BR> Part I: Production of Czech Vowels

FE Modeling of Human Vocal Tract Acoustics.<BR> Part I: Production of Czech Vowels

Effects of head geometry simplifications on acoustic radiation of vowel sounds based on time-domain finite-element simulations

Design, Realization and Experiments with a new RF Head Probe Coil for Human Vocal Tract Imaging in an NMR device

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