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Comparison of microphone array geometries for multi-point sound field reproduction

Coleman, Philip, Blanco Galindo, Miguel and Jackson, Philip (2017) Comparison of microphone array geometries for multi-point sound field reproduction In: 24th International Congress on Sound and Vibration (ICSV24), 23 – 27 July 2017, London, UK.

2017ICSV24_ColemanEtAl_soundzone_micarray.pdf - Accepted version Manuscript

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Multi-point approaches for sound field control generally sample the listening zone(s) with pressure microphones, and use these measurements as an input for an optimisation cost function. A number of techniques are based on this concept, for single-zone (e.g. least-squares pressure matching (PM), brightness control, planarity panning) and multi-zone (e.g. PM, acoustic contrast control, planarity control) reproduction. Accurate performance predictions are obtained when distinct microphone positions are employed for setup versus evaluation. While, in simulation, one can afford a dense sampling of virtual microphones, it is desirable in practice to have a microphone array which can be positioned once in each zone to measure the setup transfer functions between each loudspeaker and that zone. In this contribution, we present simulation results over a fixed dense set of evaluation points comparing the performance of several multi-point optimisation approaches for 2D reproduction with a 60 channel circular loudspeaker arrangement. Various regular setup microphone arrays are used to calculate the sound zone filters: circular grid, circular, dual-circular, and spherical arrays, each with different numbers of microphones. Furthermore, the effect of a rigid spherical baffle is studied for the circular and spherical arrangements. The results of this comparative study show how the directivity and effective frequency range of multi-point optimisation techniques depend on the microphone array used to sample the zones. In general, microphone arrays with dense spacing around the boundary give better angular discrimination, leading to more accurate directional sound reproduction, while those distributed around the whole zone enable more accurate prediction of the reproduced target sound pressure level.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Blanco Galindo,
Date : July 2017
Copyright Disclaimer : Copyright 2017 International Institute of Acoustics and Vibration (IIAV). This paper was submitted to and was presented at the 24th International Congress on Sound and Vibration (ICSV24) held in London, UK, from 23 to 27 July 2017. It was published in the ICSV24 Conference Proceedings under the copyright of the International Institute of Acoustics and Vibration (IIAV.)
Uncontrolled Keywords : sound zones, microphone arrays
Related URLs :
Depositing User : Melanie Hughes
Date Deposited : 12 Jul 2017 15:03
Last Modified : 16 Jan 2019 18:54

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