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Effect of ambisonic order on spatial release from masking
John F Culling1, A Ottopea Akrofi1, Samuel R Dighton1
1School of Psychology, Cardiff University, 70 Park Place, Cardiff CF10 3AT, United Kingdom.
The Journal of the Acoustical Society of America
|October 4, 2024
Summary
Higher-order ambisonics improve spatial release from masking (SRM) for speech intelligibility. This effect, measured using advanced audio reproduction, was robust across various acoustic settings, enhancing sound localization.
Area of Science:
- Acoustics
- Psychoacoustics
- Audio Engineering
Background:
- Spatial release from masking (SRM) is crucial for understanding speech in noisy environments.
- Ambisonics offers advanced spatial audio reproduction, but its impact on SRM requires further investigation.
Purpose of the Study:
- To quantify the effect of ambisonic order on spatial release from masking (SRM).
- To evaluate the robustness of this effect across different acoustic environments.
Main Methods:
- Two experiments measured SRM using an ambisonic reproduction system with varying ambisonic orders.
- Experiment 1 utilized ambisonic panning; Experiment 2 employed impulse responses from a sixth-order ambisonic microphone.
- Speech was presented against a speech-shaped noise masker.
Main Results:
- Both experiments demonstrated a progressive increase in SRM with higher ambisonic orders.
- SRM improved significantly up to fourth-order ambisonics and continued to increase asymptotically at higher orders.
- The observed improvement in SRM was consistent across different acoustic environments.
Conclusions:
- Increasing ambisonic order enhances spatial release from masking for speech intelligibility.
- Higher-order ambisonic systems approach the spatial audio benefits of point sources.
- The findings are robust and applicable to diverse acoustic conditions.
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