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Geometrically Constrained Room Modeling With Compact Microphone Arrays

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4 Author(s)
Ribeiro, F. ; Electron. Syst. Eng. Dept., Univ. de Sao Paulo, Sao Paulo, Brazil ; Florencio, D. ; Ba, D. ; Cha Zhang

The geometry of an acoustic environment can be an important information in many audio signal processing applications. To estimate such a geometry, previous work has relied on large microphone arrays, multiple test sources, moving sources or the assumption of a 2-D room. In this paper, we lift these requirements and present a novel method that uses a compact microphone array to estimate a 3-D room geometry, delivering effective estimates with low-cost hardware. Our approach first probes the environment with a known test signal emitted by a loudspeaker co-located with the array, from which the room impulse responses (RIRs) are estimated. It then uses an ℓ1-regularized least-squares minimization to fit synthetically generated reflections to the RIRs, producing a sparse set of reflections. By enforcing structural constraints derived from the image model, these are classified into first-, second-, and third-order reflections, thereby deriving the room geometry. Using this method, we detect walls using off-the-shelf teleconferencing hardware with a typical range resolution of about 1 cm. We present results using simulations and data from real environments.

Published in:

Audio, Speech, and Language Processing, IEEE Transactions on  (Volume:20 ,  Issue: 5 )

Date of Publication:

July 2012

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