Improved vocal tract model for the elongation of segment lengths in a real time

Qureshi, Tahir Mushtaq; Syed, K.S.

doi:10.1016/j.csl.2019.02.001

Cited by 3 publications

(4 citation statements)

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“…High-quality sound generation in real-time is made possible by the use of digital waveguide models, which are efficient and realistic computational models of the waveguide model (Mullen et al, 2007;Speed et al, 2013a). A few attempts have been made to extend the Kelly-Lochbaum model by incorporating fractional delays for the vocal tract's elongation (Mathur et al, 2006;Qureshi, Syed, 2019). The Kelly-Lochbaum model was based on the same length of each cylindrical segment.…”

Section: Introductionmentioning

confidence: 99%

A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract

2023

Archives of Acoustics

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Simulation of wave propagation in the three-dimensional (3D) modeling of the vocal tract has shown significant promise for enhancing the accuracy of speech production. Recent 3D waveguide models of the vocal tract have been designed for better accuracy but require a lot of computational tasks. A high computational cost in these models leads to novel work in reducing the computational cost while retaining accuracy and performance. In the current work, we divide the geometry of the vocal tract into four equal symmetric parts with the introduction of two axial perpendicular planes, and the simulation is performed on only one part. A novel strategy is defined to implement symmetric conditions in the mesh. The complete standard 3D digital waveguide model is assumed as a benchmark model. The proposed model is compared with the benchmark model in terms of formant frequencies and efficiency. For the demonstration, the vowels /O/, /i/, /E/, /A/, and /u/ have been selected for the simulations. According to the results, the benchmark and current models are nearly identical in terms of frequency profiles and formant frequencies. Still the current model is three times more effective than the benchmark model.

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Section: Introductionmentioning

confidence: 99%

A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract

2023

Archives of Acoustics

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“…This facilitated the specific design of the experimental protocol based on the principle in this paper. Tahir Mushtaq QURESHI [36] proposes a digital waveguide-based sound channel model. The sound channel is decomposed by the model into uniform-length cylindrical segments, the time played by the sound wave propagation in its axial direction is explored, and the predicted relevant direction is determined by this time difference.…”

Section: Introductionmentioning

confidence: 99%

Induction Mechanism of Auditory-Assisted Vision for Target Search Localization in Mixed Reality (MR) Environments

Wang

Dang

et al. 2022

Aerospace

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In MR (mixed reality) environments, visual searches are often used for search and localization missions. There are some problems with search and localization technologies, such as a limited field of view and information overload. They are unable to satisfy the need for the rapid and precise location of specific flying objects in a group of air and space targets under modern air and space situational requirements. They lead to inefficient interactions throughout the mission process. A human being’s decision and judgment will be affected by inefficient interactions. Based on this problem, we carried out a multimodal optimization study on the use of an auditory-assisted visual search for localization in an MR environment. In the spatial–spherical coordinate system, the target flight object position is uniquely determined by the height h, distance r, and azimuth θ. Therefore, there is an urgent need to study the cross-modal connections between the auditory elements and these three coordinates based on a visual search. In this paper, an experiment was designed to study the correlation between auditory intuitive perception and vision and the cognitive induction mechanism. The experiment included the three cross-modal mappings of pitch–height, volume–distance, and vocal tract alternation–spatial direction. The research conclusions are as follows: (1) Visual cognition is induced by high, medium, and low pitches to be biased towards the high, medium, and low spatial regions of the visual space. (2) Visual cognition is induced by loud, medium, and low volumes to be biased towards the near, middle, and far spatial regions of the visual space. (3) Based on the HRTF application, the vocal track alternation scheme is expected to significantly improve the efficiency of visual interactions. Visual cognition is induced by left short sounds, right short sounds, left short and long sounds, and right short and long sounds to be biased towards the left, right, left-rear, and right-rear directions of visual space. (4) The cognitive load of search and localization technologies is significantly reduced by incorporating auditory factors. In addition, the efficiency and effect of the accurate search and positioning of space-flying objects have been greatly improved. The above findings can be applied to the research on various types of target search and localization technologies in an MR environment and can provide a theoretical basis for the subsequent study of spatial information perception and cognitive induction mechanisms in an MR environment with visual–auditory coupling.

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“…A digital waveguide has also been used to model the vocal tract of animals in (Wilkinson, Reiss, 2016) and it was successfully implemented to reproduce sound effects of a lion's roar and wolf's growl. The Kelly-Lochbaum model of the vocal tract was based on the fixed-length tubes of different crosssectional areas (Kelly, Lochbaum, 1962) and some works have also been dedicated to modifying the Kelly-Lochbaum model by performing fractional elongation of the lengths of the tubes (Mathur et al, 2006;Qureshi, Ishaq, 2019;Qureshi, Syed, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…11,13,15,31,33,35, 51, 53, 55, 71, 73, 75, 91, 93, 95 are the local-nodes of the long edges in horizontal direction while nodes 2, 4, 6, 22, 24, 26, 42, 44, 46, 62, 64, 66, 82, 84, 86, 102, 104, and 106 are the local-nodes of the long edges in vertical direction. These nodes are not used…”

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confidence: 99%

Archives of Acoustics

Qureshi

Syed

Zafar

2020

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For many years, a digital waveguide model is being used for sound propagation in the modeling of the vocal tract with the structured and uniform mesh of scattering junctions connected by same delay lines. There are many varieties in the formation and layouts of the mesh grid called topologies. Current novel work has been dedicated to the mesh of two-dimensional digital waveguide models of sound propagation in the vocal tract with the structured and non-uniform rectilinear grid in orientation. In this work, there are two types of delay lines: one is called a smaller-delay line and other is called a larger-delay line. The larger-delay lines are the double of the smaller delay lines. The scheme of using the combination of both smaller-and larger-delay lines generates the non-uniform rectilinear two-dimensional waveguide mesh. The advantage of this approach is the ability to get a transfer function without fractional delay. This eliminates the need to get interpolation for the approximation of fractional delay and give efficient simulation for sound wave propagation in the two-dimensional waveguide modeling of the vocal tract. The simulation has been performed by considering the vowels /O/, /a/, /i/ and /u/ in this work. By keeping the same sampling frequency, the standard two-dimensional waveguide model with uniform mesh is considered as our benchmark model. The results and efficiency of the proposed model have compared with our benchmark model.

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Improved vocal tract model for the elongation of segment lengths in a real time

Cited by 3 publications

References 36 publications

A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract

A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract

Induction Mechanism of Auditory-Assisted Vision for Target Search Localization in Mixed Reality (MR) Environments

Archives of Acoustics

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