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Intelligibility and localization of speech from virtual directions
1Grumman Aerospace Corporation, Bethpage, New York.
Human Factors
|March 1, 1994
Summary
Adding synthetic directional cues to speech significantly improves intelligibility and aids in sound localization. This research explores how auditory spatial information enhances speech perception in noisy environments.
Area of Science:
- Auditory perception
- Speech processing
- Psychoacoustics
Background:
- Speech intelligibility is crucial for communication.
- Auditory spatial cues aid in understanding speech, especially in noise.
- Previous research explored localization but less on intelligibility enhancement via synthetic cues.
Purpose of the Study:
- To investigate the impact of synthetic directional cues on speech intelligibility.
- To assess listeners' ability to localize speech with added directional information.
- To understand how spatial separation affects speech recognition thresholds.
Main Methods:
- Measuring masked speech thresholds using the Modified Rhyme Test with synthesized speech.
- Employing broadband white noise as a masker fixed at 0 degrees.
- Using head-related transfer functions for headphone presentation and allowing head movements.
- Assessing listeners' ability to estimate sound source azimuth.
Main Results:
- Speech intelligibility improved by 4-5 dB when presented from different azimuths.
- Individual masked thresholds varied but were repeatable, with unique azimuth-dependent patterns.
- Listeners accurately localized sound sources, similar to previous studies.
- Front-back localization confusions were evenly distributed across azimuths.
Conclusions:
- Synthetic directional information enhances speech intelligibility in noise.
- Spatial separation of speech sources improves auditory perception.
- Head movements contribute to the perception of spatial audio.
- Localization accuracy is maintained, but front-back confusions persist.