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Wednesday, July 10 • 12:10 - 12:30
REFINEMENT AND IMPLEMENTATION OF A ROBUST DIRECTIONAL ROOM IMPULSE RESPONSE DENOISING PROCESS, INCLUDING APPLICATIONS TO HIGHLY VARIED MEASUREMENT DATABASES

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Recent developments in the measurement of directional room impulse responses (DRIR) by spherical microphone arrays (SMA) have led to their extensive use in sound spatialisation. Room reverberation effects can be reproduced in three-dimensional surround sound systems (e.g. Higher-Order Ambisonics) through multi-channel DRIR convolution. However, such measured impulse responses inevitably present a non-negligible noise floor, leading to a perceptible 'infinite reverberation effect'. Further, individual sensor noise and non-stationary measurement artifacts may additionally corrupt the deconvolved impulse response. This paper presents recent work regarding the implementation of state of the art DRIR analysis and denoising techniques and their application to extensive DRIR databases measured across a highly varied collection of spaces. We first review the basic energy decay relief (EDR) analysis and reverberation tail re-synthesis process, before presenting several novel refinements developed throughout the course of this implementation. Finally, an overview of the results obtained both globally and with respect to particular cases (complex architectural volumes, outdoor spaces, etc.) is included in order to further examine the capabilities of the denoising framework.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
CH

Claes Hedberg

Professor, Blekinge Institute of Technology

Authors

Wednesday July 10, 2019 12:10 - 12:30 EDT
Westmount 2
  T01 Ac. meas. & instrum., SS01 Snd & vibr measur & analys