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• W2040910067 abstract "Spherical microphone arrays have been recently used for room acoustics analysis, to detect the direction-of-arrival of early room reflections, and compute directional room impulse responses and other spatial room acoustics parameters. Previous works presented methods for room acoustics analysis using spherical arrays that are based on beamforming, e.g., delay-and-sum, regular beamforming, and Dolph-Chebyshev beamforming. Although beamforming methods provide useful directional selectivity, optimal array processing methods can provide enhanced performance. However, these algorithms require an array cross-spectrum matrix with a full rank, while array data based on room impulse responses may not satisfy this condition due to the single frame data. This paper presents a smoothing technique for the cross-spectrum matrix in the frequency domain, designed for spherical microphone arrays, that can solve the problem of low rank when using room impulse response data, therefore facilitating the use of optimal array processing methods. Frequency smoothing is shown to be performed effectively using spherical arrays, due to the decoupling of frequency and angular components in the spherical harmonics domain. Experimental study with data measured in a real auditorium illustrates the performance of optimal array processing methods such as MUSIC and MVDR compared to beamforming." @default.
• W2040910067 created "2016-06-24" @default.
• W2040910067 creator A5019518606 @default.
• W2040910067 creator A5046664647 @default.
• W2040910067 date "2012-07-01" @default.
• W2040910067 modified "2023-10-01" @default.
• W2040910067 title "Acoustic analysis by spherical microphone array processing of room impulse responses" @default.
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• W2040910067 doi "https://doi.org/10.1121/1.4726012" @default.
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