Two-Polarisation Physical Model of Bowed Strings with Nonlinear Contact and Friction Forces, and Application to Gesture-Based Sound Synthesis

Desvages, Charlotte; Bilbao, Stefan

doi:10.3390/app6050135

Cited by 16 publications

(11 citation statements)

References 29 publications

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“…The inclusion of the two transverse polarisations in the modeling of vibrating strings with contact is also seldom seen in the literature. A rst attempt has been proposed in [35] for the case of the violin, where nite dierences are employed to model a linear bowed string motion, including interactions between the string and ngers as well as the ngerboard. Early developments are also shown in [36], extending the study presented in [33].…”

Section: Introductionmentioning

confidence: 99%

A modal-based approach to the nonlinear vibration of strings against a unilateral obstacle: Simulations and experiments in the pointwise case

Issanchou

Bilbao

Carrou

et al. 2017

Journal of Sound and Vibration

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International audienceThis article is concerned with the vibration of a stiff linear string in the presence of a rigid obstacle. A numerical method for unilateral and arbitrary-shaped obstacles is developed, based on a modal approach in order to take into account the frequency dependence of losses in strings. The contact force of the barrier interaction is treated using a penalty approach, while a conservative scheme is derived for time integration, in order to ensure long-term numerical stability. In this way, the linear behaviour of the string when not in contact with the barrier can be controlled via a mode by mode fitting, so that the model is particularly well suited for comparisons with experiments. An experimental configuration is used with a point obstacle either centered or near an extremity of the string. In this latter case, such a pointwise obstruction approximates the end condition found in the tanpura, an Indian stringed instrument. The second polarisation of the string is also analysed and included in the model. Numerical results are compared against experiments, showing good accuracy over a long time scale

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Section: Introductionmentioning

confidence: 99%

A modal-based approach to the nonlinear vibration of strings against a unilateral obstacle: Simulations and experiments in the pointwise case

Issanchou

Bilbao

Carrou

et al. 2017

Journal of Sound and Vibration

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“…In the recent years a number of advances have been done in several fields of computational acoustics, from the emulation of 3D spaces by finite difference modelling [1] to nonlinear strings [2] and plates [3]. Among well-known methods [4], [5], some rely on an accurate description of a physical setting, and its parameters, thus, can be measured from real settings or purportedly generated to simulate a specific one.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Stage Algorithm for Acoustic Physical Model Parameters Estimation

Gabrielli

Tomassetti

Squartini

et al. 2019

IEEE/ACM Trans. Audio Speech Lang. Process.

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One of the challenges in computational acoustics is the identification of models that can simulate and predict the physical behavior of a system generating an acoustic signal. Whenever such models are used for commercial applications an additional constraint is the time-to-market, making automation of the sound design process desirable. In previous works, a computational sound design approach has been proposed for the parameter estimation problem involving timbre matching by deep learning, which was applied to the synthesis of pipe organ tones. In this work we refine previous results by introducing the former approach in a multi-stage algorithm that also adds heuristics and a stochastic optimization method operating on objective cost functions based on psychoacoustics. The optimization method shows to be able to refine the first estimate given by the deep learning approach and substantially improve the objective metrics, with the additional benefit of reducing the sound design process time. Subjective listening tests are also conducted to gather additional insights on the results.Index Terms-physics-based acoustic modeling, neural networks, computational sound design, iterative optimization

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“…Most of the methods presented in the last years use a regularisation in order to treat numerically the contact force, see e.g. the energy-conserving schemes proposed by Desvages and Bilbao, 2015;Ducceschi et al, 2016) and by van Walstijn et al (Chatziioannou and van Walstijn, 2015;, the modal approach proposed in (Issanchou et al, 2017) or the approach followed in (Inácio et al, 2006) to model the interaction between a puja (exciting stick) and a Tibetan bowl. In all these studies the contact force is modeled using a power-law method with two parameters defining the stiffness of the repelling force, thus allowing to cover a wide range of contact laws, from soft collisions, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Nonsmooth contact dynamics for the numerical simulation of collisions in musical string instruments

Issanchou

Acary

Pérignon

et al. 2018

The Journal of the Acoustical Society of America

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Collisions in musical string instruments play a fundamental role in explaining the sound production in various instruments such as sitars, tanpuras and electric basses. Contacts occuring during the vibration provide a nonlinear effect which shapes a specific tone due to energy transfers and enriches the hearing experience. As such, they must be carefully simulated for the purpose of physically-based sound synthesis. Most of the numerical methods presented in the literature rely on a compliant modeling of the contact force between the string and the obstacle. In this contribution, numerical methods from nonsmooth contact dynamics are used to integrate the problem in time. A Moreau-Jean time-stepping scheme is combined with an exact scheme for phases with no contact, thus controlling the numerical dispersion. Results for a two-point bridge mimicking a tanpura and an electric bass are presented, showing the ability of the method to deal efficiently with such problems while invoking, as compared to a compliant approach, less modelling parameters and a reduced computational burden.

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Two-Polarisation Physical Model of Bowed Strings with Nonlinear Contact and Friction Forces, and Application to Gesture-Based Sound Synthesis

Cited by 16 publications

References 29 publications

A modal-based approach to the nonlinear vibration of strings against a unilateral obstacle: Simulations and experiments in the pointwise case

A modal-based approach to the nonlinear vibration of strings against a unilateral obstacle: Simulations and experiments in the pointwise case

A Multi-Stage Algorithm for Acoustic Physical Model Parameters Estimation

Nonsmooth contact dynamics for the numerical simulation of collisions in musical string instruments

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