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Related Experiment Video

Updated: Jun 5, 2026

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

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

Published on: March 13, 2026

Localization system for urban search and rescue using smartphone microphones.

Ayumi Matsumoto¹, Hiroki Miyazako¹, Takaaki Nara¹

¹Graduate School of Information Science and Technology, The University of Tokyo, Tokyo 113-8656, Japan.

JASA Express Letters

|June 4, 2026

Summary

This study introduces a novel method to locate earthquake survivors by detecting their smartphones using audible sound. The system guides rescuers by pinpointing the device

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Area of Science:

Engineering
Search and Rescue Technology
Acoustics

Background:

Earthquake disasters necessitate rapid and effective methods for rescuing buried survivors.
Locating victims quickly is critical for increasing survival rates in collapsed structures.

Purpose of the Study:

To develop and validate a method for detecting buried victims' smartphones using audible sound.
To enable searchers to determine the direction of a victim's smartphone for rescue operations.

Main Methods:

A searcher generates directional sound fields using an array of four loudspeakers.
A victim's smartphone detects these sound fields.
The smartphone computes its azimuth relative to the searcher and transmits this data.

Main Results:

Experiments in a simulated earthquake disaster field successfully validated the proposed method.
The system allowed searchers to repeatedly estimate the smartphone's direction.
Searchers could successfully approach the smartphone by moving the sound source.

Conclusions:

The proposed audible sound-based smartphone detection method is effective for locating earthquake survivors.
This technology offers a promising tool for enhancing search and rescue operations in earthquake scenarios.