Modal smoothing for analysis of room reflections measured with spherical microphone and loudspeaker arrays

The Journal of the Acoustical Society of America
Hai Morgenstern, Boaz Rafaely

Abstract

Spatial analysis of room acoustics is an ongoing research topic. Microphone arrays have been employed for spatial analyses with an important objective being the estimation of the direction-of-arrival (DOA) of direct sound and early room reflections using room impulse responses (RIRs). An optimal method for DOA estimation is the multiple signal classification algorithm. When RIRs are considered, this method typically fails due to the correlation of room reflections, which leads to rank deficiency of the cross-spectrum matrix. Preprocessing methods for rank restoration, which may involve averaging over frequency, for example, have been proposed exclusively for spherical arrays. However, these methods fail in the case of reflections with equal time delays, which may arise in practice and could be of interest. In this paper, a method is proposed for systems that combine a spherical microphone array and a spherical loudspeaker array, referred to as multiple-input multiple-output systems. This method, referred to as modal smoothing, exploits the additional spatial diversity for rank restoration and succeeds where previous methods fail, as demonstrated in a simulation study. Finally, combining modal smoothing with a preprocessing meth...Continue Reading

References

Nov 15, 2002·The Journal of the Acoustical Society of America·Bradford N GoverMichael R Stinson
May 12, 2009·The Journal of the Acoustical Society of America·Boaz Rafaely
Jan 12, 2011·The Journal of the Acoustical Society of America·Alexander Mattioli PasqualJosé Roberto de França Arruda
Apr 17, 2012·The Journal of the Acoustical Society of America·Haohai SunWalter Kellermann
Jul 12, 2012·The Journal of the Acoustical Society of America·Dima Khaykin, Boaz Rafaely
Jun 8, 2013·The Journal of the Acoustical Society of America·Nejem Huleihel, Boaz Rafaely
Dec 3, 2015·The Journal of the Acoustical Society of America·Hai MorgensternFranz Zotter
Apr 5, 2017·The Journal of the Acoustical Society of America·Hai MorgensternMarkus Noisternig

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Citations

Jan 3, 2020·The Journal of the Acoustical Society of America·Christopher R Landschoot, Ning Xiang

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