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Updated: Aug 10, 2026
07:52
An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
Published on: March 13, 2026
A low cost, non-individualized surround sound system based upon head related transfer functions: an ergonomics study
R H Y So1, N M Leung, J Braasch
1Department of Industrial Engineering and Logistics Management, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong SAR. rhyso@ust.hk
Applied Ergonomics
|March 10, 2006
Summary
Simulating binaural cues with simplified head-related transfer functions (HRTFs) increases sound localization errors, especially at oblique angles. A novel virtual headphone-based surround-sound system outperformed traditional stereo systems.
Area of Science:
- Acoustics
- Psychoacoustics
- Human-Computer Interaction
Background:
- Head-related transfer functions (HRTFs) are crucial for generating realistic spatial audio.
- Non-individualized HRTFs are computationally efficient but may introduce localization errors.
- Understanding the impact of HRTF complexity on binaural cue accuracy is essential for virtual audio systems.
Purpose of the Study:
- To investigate the relationship between head-related transfer function (HRTF) complexity and binaural cue localization errors.
- To evaluate the performance of a novel virtual headphone-based surround-sound (VHSS) system compared to a conventional stereo system.
Main Methods:
- Localization errors were measured using simulated binaural cues derived from HRTFs with varying complexity (128, 64, 32, 18 non-zero coefficients).
- Experiment 1 involved 24 participants localizing sounds at nine different azimuth angles.
- A double-blind usability test compared the prototype VHSS system against a Dolby stereo system with 32 participants.
Main Results:
- Reduced HRTF complexity significantly increased localization errors for oblique sound directions (45°, 135°, 225°, 315° azimuth).
- Localization errors were not significantly affected by HRTF complexity for frontal and cardinal directions (0°, 90°, 270° azimuth).
- The prototype VHSS system achieved significantly higher surround-sound ratings than the Dolby stereo system.
Conclusions:
- HRTF complexity is a critical factor influencing spatial audio perception, particularly for off-center sound sources.
- Optimized HRTF complexity, not necessarily the highest, can yield better localization performance.
- The developed VHSS system offers a promising advancement in headphone-based immersive audio experiences.
