Localization of tones in a room by moving listeners

Area of Science:

• Acoustics
• Psychoacoustics
• Human Perception

Background:

• Sound localization in enclosed spaces is challenging due to standing waves creating complex interaural differences.
• These complex acoustic cues can become uninterpretable for listeners, hindering accurate sound source identification.

Purpose of the Study:

• To investigate whether listener mobility enhances sound source localization in a reverberant environment.
• To explore and model dynamic listener localization strategies.

Main Methods:

• Eight human listeners performed sound localization tasks in a dry room at low and high frequencies.
• Listener head and torso movements were tracked electronically, and ear-canal signals were recorded during 9-second trials.
• Two computational models (relative null and inferred source strategies) were tested using the collected movement and signal data.

Main Results:

• A modest improvement in sound localization was observed when listeners were permitted to move, particularly at high frequencies.
• Both tested models demonstrated statistical success in interpreting localization cues derived from listener motion and evolving sound fields.

Conclusions:

• Allowing listeners to move dynamically can mitigate challenges in sound localization caused by room acoustics.
• Computational models incorporating listener motion can effectively predict source locations based on complex, time-varying auditory cues.