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Experimental acoustic scene analysis using One-Eighth spherical fraction microphone array
T Blanchard1, P Lecomte2, M Melon1
1Laboratoire d'Acoustique de l'Université du Mans (LAUM), UMR 6613, Institut d'Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, France.
The Journal of the Acoustical Society of America
|February 2, 2022
Summary
This study tested a novel one-eighth Spherical Fraction Microphone Array for analyzing acoustic scenes. Experimental results validated the array
Area of Science:
- Acoustics
- Signal Processing
- Array Signal Processing
Background:
- Acoustic scene analysis requires specialized microphone arrays.
- Traditional arrays face limitations in confined or bounded spaces.
- Spherical arrays offer potential for improved spatial analysis.
Purpose of the Study:
- To investigate the performance of a one-eighth Spherical Fraction Microphone Array.
- To analyze acoustic scenes within a one-eighth spatial sector.
- To evaluate the effectiveness of Spherical Fraction Beamforming (SFB) in bounded environments.
Main Methods:
- Experimental measurements using two prototypes (8 and 16 microphones).
- Analytical and numerical spatial aliasing analysis.
- Spherical Fraction Beamforming (SFB) for acoustic pressure field decomposition.
- Evaluation of localization angular error and Directivity Index.
Main Results:
- Experimental results showed consistency with simulations.
- Theoretical limitations of SFB in a bounded one-eighth space were experimentally confirmed.
- Array performance was evaluated in an anechoic room and a real office environment.
Conclusions:
- The one-eighth Spherical Fraction Microphone Array demonstrates viable performance for acoustic scene analysis in bounded spaces.
- Spherical Fraction Beamforming (SFB) shows promise but has inherent limitations in such configurations.
- Further research on SFB is warranted, including investigations with virtual sound sources.
