Download Expressive Controllers For Bowed String Physical Models In this paper we propose different approaches to control a real-time physical model of a bowed string instrument. Starting from a commercially available device, we show how to improve the gestural control of the model.
Download Modeling Collision Sounds: Non-Linear Contact Force A model for physically based synthesis of collision sounds is proposed. Attention is focused on the non-linear contact force, for which both analytical and experimental results are presented. Numerical implementation of the model is discussed, with regard to accuracy and efficiency issues. As an application, a physically based audio effect is presented.
Download Discrete Implementation Of The First Order System Cascade As The Basis For A Melodic Segmentation Model The basis for a low-level melodic segmentation model and its discrete implementation is presented. The model is based on the discrete approximation of the one-dimensional convective transport mechanism. In this way, a physically plausible mechanism for achieving multi-scale representation is obtained. Some aspects of edge detection theory thought to be relevant for solving similar problems in auditory perception are briefly introduced. Two examples presenting the dynamic behaviour of the model are shown.
Download Toward A New Model For Sound Control The control of sound synthesis is a well-known problem. This is particularly true if the sounds are generated with physical modeling techniques that typically need specification of numerous control parameters. In the present work outcomes from studies on automatic music performance are used for tackling this problem.
Download Recognition Of Ellipsoids From Acoustic Cues Ideal three-dimensional resonators are “labeled” (identified) by infinite sequences of resonance modes, whose distribution depends on the resonator shape. We are investigating the ability of human beings to recognize these shapes by auditory spectral cues. Rather than focusing on a precise simulation of the resonator, we want to understand if the recognition takes place using simplified “cartoon” models, just providing the first resonances that identify a shape. In fact, such models can be easily translated into efficient algorithms for real-time sound synthesis in contexts of human-machine interaction, where the resonator shape and other rendering parameters can be interactively manipulated. This paper describes the method we have followed to come up with an application that, executed in real-time, can be used in listening tests of shape recognition and together with human-computer interfaces.
Download Modeling And Sonifying Pen Strokes On Surfaces This paper will describe the approach of modeling and sonifying the interaction with a pen on surfaces. The main acoustic parts and the dynamic behavior of the interaction are identified and a synthesis model is proposed to imitate the sound emanation during typical interactions on surfaces. Although a surface is twodimensional, modeling acoustical qualities of surfaces has to employ volumes to form resonances. Specific qualities of surfaces like the roughness and the texture are imitated by a noise generator which is controlled by the pen movement in real-time to achieve a maximum of acceptance of the sound effect. The effect will be used one hand to produce natural and coherent interaction on nearly silent electronic white boards or pen-tablets, i.e., reinventing of lost sound qualities. On the other hand modeling and sonifying pen strokes on surfaces allow to convey information about the properties of different areas or the current state of a windows of a computer display by using this sound feedback. Keywords : sound model, human-computer interaction, real-time, disappearing computer, audio feedback, sonification, mixed reality, multi-modal
Download Magnitude-Complementary Filters For Dynamic Equalization Discrete-time structures of first-order and second-order equalization filters are proposed. They turn to be particularly useful in applications where the equalization parameters are dynamically varied, such as in contexts of audio virtual reality. In fact, their design allows a simplified and more direct control of the filter coefficients, at the cost of some more computation cycles that are required, during each time step, by implementations on real-time processing devices.
Download Digital Waveguide Mesh Modelling Of Room Acoustics: Surround-Sound, Boundaries And Plugin Implementation Digital waveguide mesh models have provided an accurate and efficient method of modelling the properties of many resonant structures, including acoustic spaces. 2-D rectilinear and triangular mesh structures have been used extensively in the past to model plates and membranes and as potential analogues to 2-D acoustic spaces. This paper looks at current developments relating to this technique and attempts to highlight potential ways forward for this research. This includes an investigation into the potential suitability of this technique for surround-sound applications and a realtime implementation as a VST plugin.
Download Computer Synthesis Of Bird Songs And Calls Bird songs are fascinating acoustic phenomena. In this paper, we first examine the acoustic mechanisms of sound production in birds and contrast them with their anatomy. Next, we describe the simulation of a one-mass source together with a simple transmission line model for a psittacine bird. In concluding, we discuss future areas for research.