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Analysis, Design and Implementation of Multichannel Audio Systems

Student thesis: Doctoral ThesisDoctor of Philosophy

This thesis is concerned with the analysis, design and implementation
of multichannel audio systems. The design objective is to reconstruct
a given sound eld such that it is perceptually equivalent to the
recorded one. A framework for the design of circular microphone arrays
is proposed. This framework is based on tting of psychoacoustic
data and enables the design of both coincident and quasi-coincident
arrays. Results of formal listening experiments suggest that the proposed
methodology performs on a par with state of the art methods,
albeit with a more graceful degradation away from the centre of the
loudspeaker array. A computational model of auditory perception is
also developed to estimate the subjects' response in a broader class
of conditions than the ones considered in the listening experiments.
The model predictions suggest that quasi-coincident microphone arrays
result in auditory events that are easier to localise for o centre
listeners. Two technologies are developed to enable using the proposed
framework for recording of real sound elds (e.g. live concert)
and virtual ones (e.g. video-games). Dierential microphones are
identied as desirable candidates for the case of real sound elds and
are adapted to suit the framework requirements. Their robustness to
self-noise is assessed and measurements of a third-order prototype are
presented. Finally, a scalable and interactive room acoustic simulator
is proposed to enable virtual recordings in simulated sound elds.
Original languageEnglish
Awarding Institution
Supervisors/Advisors
Award date1 Jul 2013

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