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MICROPHONE ARRAY DESIGN FOR SPATIAL AUDIO OBJECT EARLY REFLECTION PARAMETRISATION FROM ROOM IMPULSE RESPONSES

Blanco Galindo, Miguel, Jackson, Philip, Coleman, Philip and Remaggi, Luca (2017) MICROPHONE ARRAY DESIGN FOR SPATIAL AUDIO OBJECT EARLY REFLECTION PARAMETRISATION FROM ROOM IMPULSE RESPONSES In: 24th International Congress on Sound and Vibration (ICSV24), 23 - 27 July 2017, London, UK.

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Abstract

Room Impulse Responses (RIRs) measured with microphone arrays capture spatial and nonspatial information, e.g. the early reflections’ directions and times of arrival, the size of the room and its absorption properties. The Reverberant Spatial Audio Object (RSAO) was proposed as a method to encode room acoustic parameters from measured array RIRs. As the RSAO is object-based audio compatible, its parameters can be rendered to arbitrary reproduction systems and edited to modify the reverberation characteristics, to improve the user experience. Various microphone array designs have been proposed for sound field and room acoustic analysis, but a comparative performance evaluation is not available. This study assesses the performance of five regular microphone array geometries (linear, rectangular, circular, dual-circular and spherical) to capture RSAO parameters for the direct sound and early reflections of RIRs. The image source method is used to synthesise RIRs at the microphone positions as well as at the centre of the array. From the array RIRs, the RSAO parameters are estimated and compared to the reference parameters at the centre of the array. A performance comparison among the five arrays is established as well as the effect of a rigid spherical baffle for the circular and spherical arrays. The effects of measurement uncertainties, such as microphone misplacement and sensor noise errors, are also studied. The results show that planar arrays achieve the most accurate horizontal localisation whereas the spherical arrays perform best in elevation. Arrays with smaller apertures achieve a higher number of detected reflections, which becomes more significant for the smaller room with higher reflection density.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Blanco Galindo, Miguelm.blancogalindo@surrey.ac.ukUNSPECIFIED
Jackson, PhilipP.Jackson@surrey.ac.ukUNSPECIFIED
Coleman, Philipp.d.coleman@surrey.ac.ukUNSPECIFIED
Remaggi, Lucalr0021@surrey.ac.ukUNSPECIFIED
Date : 23 July 2017
Copyright Disclaimer : Copyright 2017 International Institute of Acoustics and Vibration. 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 : microphone arrays, spatial room impulse responses
Related URLs :
Depositing User : Melanie Hughes
Date Deposited : 12 Jul 2017 15:41
Last Modified : 18 Jul 2017 08:57
URI: http://epubs.surrey.ac.uk/id/eprint/841631

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