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Updated: Jun 10, 2026

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
Published on: March 13, 2026
Locating arbitrarily time-dependent sound sources in three dimensional space in real time
1Department of Mechanical Engineering, Wayne State University, Detroit, Michigan 48202, USA.
This study introduces a real-time acoustic source localization method using four microphones. It accurately pinpoints multiple sound sources in 3D space, even moving ones, with high precision.
Area of Science:
- Acoustics
- Signal Processing
- Array Signal Processing
Background:
- Accurate localization of acoustic sources is crucial for various applications, including noise control and surveillance.
- Existing methods often require numerous sensors or have limitations in handling complex acoustic environments and dynamic sources.
Purpose of the Study:
- To develop and validate a real-time method for localizing arbitrarily time-dependent acoustic sources in a free field using a minimal sensor array.
- To investigate the influence of signal-to-noise ratio (SNR), microphone configuration, and source characteristics on localization accuracy.
Main Methods:
- A hybrid approach combining acoustic radiation modeling, triangulation, and signal de-noising (enhancing SNR).
- Utilizing a compact four-microphone array positioned on orthogonal axes for 3D source identification.
- Numerical simulations and experimental validation in diverse environments.
Main Results:
- The proposed method effectively localizes multiple acoustic sources, including broadband, narrowband, and impulsive signals.
- Localization accuracy is demonstrated to be dependent on SNR, microphone spacing, source distance, and frequency.
- The fabricated device successfully identified stationary and moving sound sources, even those located behind the microphone array.
Conclusions:
- The four-microphone system offers a practical and effective solution for real-time acoustic source localization in free fields.
- The hybrid methodology provides robust performance across various acoustic conditions and source behaviors.
- Further research can explore limitations and optimize performance for specific challenging scenarios.
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