Conference Paper
Soundfield rendering with loudspeaker arrays through multiple beam shaping
Dipt. di Elettron. ed Inf., Politec. di Milano, Milan, Italy
DOI: 10.1109/ASPAA.2009.5346484 Conference: Applications of Signal Processing to Audio and Acoustics, 2009. WASPAA '09. IEEE Workshop on Source: DBLP

Conference Paper: The SCENIC Project: SpaceTime Audio Processing for EnvironmentAware Acoustic Sensing and Rendering
AES Convention; 10/2011  [Show abstract] [Hide abstract]
ABSTRACT: Spatial sound rendering techniques are based on established theoretical frameworks. The theoretical wave field predicted by the underlying of a specific rendering technique is an approximation of the desired ideal wave field. Moreover the practical implementations require often compromises which cause an additional deviation of the rendered wave field from the desired one. To assess these deviations, metrics are devised which quantify the difference of two wave fields. Typically they rely on the comparison of the wave fields at a discrete set of positions in the area of interest (discretespace metric). In this paper a novel metric is proposed which is formulated in the angular frequency domain. It expresses the difference of two wave fields in terms of their Fourier series angular coefficients. It is efficient since it avoids the spatial summation over a discrete grid in the area of interest, moreover it is flexible since it considers a weighting function to focus the evaluation on specific regions of spatial and temporal frequencies. After a theoretical treatment such a metric is computed for simulated and measured data and compared with a discretespace metric. The comparison shows that the new metric yields results which allow a flexible assessment of the characteristics of the rendering techniques. 
Conference Paper: Rendering of Directional Sources through Loudspeaker Arrays based on Plane Wave Decomposition
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ABSTRACT: In this paper we present a technique for the rendering of directional sources by means of loudspeaker arrays. The proposed methodology is based on a decomposition of the sound field in terms of plane waves. Within this framework the directivity of the source is naturally included in the rendering problem, therefore accommodating the directivity into the picture becomes much simpler. For this purpose, the loudspeaker array is subdivided into overlapping subarrays, each generating a plane wave component. The individual plane waves are then weighed by the desired directivity pattern. Simulations and experimental results show that the proposed technique is able to reproduce the sound field of directional sources with an improved accuracy with respect to existing techniques.IEEE International Workshop on Multimedia Signal Processing, Pula; 09/2013
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