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This paper covers the theory, measurement and analysis of a constructed reference system to capture and acoustically reconstruct a spatial soundfield for device testing. Using a rigid sphere microphone array, a framework is presented for numeric and visual representation of the multidimensional system performance. This is used to compare the measured acoustic spatial recreation of a practical 30 channel...
A loudspeaker array is a key component in active noise cancellation (ANC) systems. Most in-car ANC systems utilize the car's own integrated loudspeakers to cancel the noise due to engine and other sources. In this paper, we evaluate the integrated loudspeakers' noise cancelling capabilities by analyzing the in-car noise field and the loudspeaker responses. We show that the average noise power in a...
In this paper, we present a theoretical basis and implementation strategies for 2.5-dimensional (2.5D) sound field reproduction in higher order Ambisonics. The issue associated with 2.5D system is the intrinsic dimensionality mismatch between a desired 2-dimensional (2D) sound field and the loudspeaker employed for reproduction, whose spatial properties are more accurately modelled by that of a 3-dimensional...
Three dimensional sound field reproduction based on higher order Ambisonics requires the placement of loudspeakers on a sphere that surrounds the target reproduction region. The deployment of a spherical array is not trivial especially for implementation in real rooms where the placement flexibility is highly desirable. This paper proposes a design of multiple circular loudspeaker arrays for reproducing...
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