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Estimation of Room Reflection Parameters for a Reverberant Spatial Audio Object

Remaggi, Luca, Jackson, PJB and Coleman, Philip (2015) Estimation of Room Reflection Parameters for a Reverberant Spatial Audio Object In: 138th Convention of the Audio Engineering Society, 2015-05-07 - 2015-05-10, Warsaw.

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Abstract

Estimating and parameterizing the early and late reflections of an enclosed space is an interesting topic in acoustics. With a suitable set of parameters, the current concept of a spatial audio object (SAO), which is typically limited to either direct (dry) sound or diffuse field components, could be extended to afford an editable spatial description of the room acoustics. In this paper we present an analysis/synthesis method for parameterizing a set of measured room impulse responses (RIRs). RIRs were recorded in a medium-sized auditorium, using a uniform circular array of microphones representing the perspective of a listener in the front row. During the analysis process, these RIRs were decomposed, in time, into three parts: the direct sound, the early reflections, and the late reflections. From the direct sound and early reflections, parameters were extracted for the length, amplitude, and direction of arrival (DOA) of the propagation paths by exploiting the dynamic programming projected phase-slope algorithm (DYPSA) and classical delay-and-sum beamformer (DSB). Their spectral envelope was calculated using linear predictive coding (LPC). Late reflections were modeled by frequency-dependent decays excited by band-limited Gaussian noise. The combination of these parameters for a given source position and the direct source signal represents the reverberant or “wet” spatial audio object. RIRs synthesized for a specified rendering and reproduction arrangement were convolved with dry sources to form reverberant components of the sound scene. The resulting signals demonstrated potential for these techniques, e.g., in SAO reproduction over a 22.2 surround sound system.

Item Type: Conference or Workshop Item (Conference Paper)
Subjects : Electronic Engineering
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Remaggi, Lucal.remaggi@surrey.ac.ukUNSPECIFIED
Jackson, PJBP.Jackson@surrey.ac.ukUNSPECIFIED
Coleman, Philipp.d.coleman@surrey.ac.ukUNSPECIFIED
Date : 6 May 2015
Copyright Disclaimer : This paper was presented at the 138th Convention of the Audio Engineering Society, as paper number 9258. The full published version can be found at http://www.aes.org/e-lib/browse.cfm?elib=17682
Contributors :
ContributionNameEmailORCID
http://www.loc.gov/loc.terms/relators/PBLAudio Engineering Society, UNSPECIFIEDUNSPECIFIED
Depositing User : Symplectic Elements
Date Deposited : 08 Nov 2016 16:13
Last Modified : 04 Jul 2017 11:14
URI: http://epubs.surrey.ac.uk/id/eprint/808157

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