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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
07:52

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

Published on: March 13, 2026

Passive sonic detection and ranging for locating sound sources.

Sean F Wu1, Na Zhu

  • 1Department of Mechanical Engineering, Wayne State University, Detroit, Michigan 48202, USA. sean_wu@wayne.edu

The Journal of the Acoustical Society of America
|June 8, 2013
PubMed
Summary

A new passive sonic detection and ranging (SODAR) system accurately locates sound sources in real-time. This technology enhances signal processing and uses microphone triangulation for precise sound source identification.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Accurate real-time sound source localization is crucial in various applications.
  • Existing methods often struggle in complex environments with signal reflections and noise.
  • Passive systems offer advantages by not emitting their own signals.

Purpose of the Study:

  • To develop and validate a passive sonic detection and ranging (SODAR) technology for real-time sound source localization.
  • To address challenges posed by non-ideal acoustic environments with numerous reflections and diffractions.
  • To determine the minimum hardware requirements and optimal configuration for the passive SODAR system.

Main Methods:

  • Pre-processing of acoustic data to improve signal-to-noise ratio.
  • Acoustic modeling of sound radiation from point sources.
  • Iterative triangulation algorithms utilizing data from multiple microphones.
  • Optimization processes to enhance detection range and localization accuracy in complex environments.
  • Utilizing computations based on predicted source locations from non-coplanar microphone arrays.

Main Results:

  • The developed passive SODAR system successfully locates sound sources emitting arbitrarily time-dependent signals.
  • The system demonstrates effectiveness for various signal types including continuous, transient, impulsive, random, narrow-band, and broadband sounds above 20 Hz.
  • Experimental validation confirms the system's capability in real-time, non-ideal acoustic conditions.
  • The minimum requirement for microphone placement is six units, provided they are not coplanar and maintain clear lines of sight.

Conclusions:

  • Passive SODAR is a viable technology for accurate, real-time sound source localization.
  • The proposed comprehensive approach, including advanced signal processing and optimization, overcomes environmental acoustic challenges.
  • The system's flexibility in microphone placement (non-coplanar, unblocked line-of-sight) enhances its practical applicability.