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Echo

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...

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Updated: Oct 4, 2025

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

Published on: December 3, 2016

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 summary is machine-generated.

This study tested a novel one-eighth Spherical Fraction Microphone Array for analyzing acoustic scenes. Experimental results validated the array

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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.