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Localization of two noise sources overlapping in time
Journal of Speech and Hearing Research
|December 1, 1975
Summary
Auditory localization accuracy improved for sounds presented at the side when the onset time between two noise sources increased. Perceiving two distinct sounds enhanced localization performance, especially with practice.
Area of Science:
- Auditory perception
- Acoustic spatial processing
- Psychoacoustics
Background:
- Accurate sound localization is crucial for spatial awareness.
- Overlapping auditory signals present challenges for perception and localization.
Purpose of the Study:
- To investigate the accuracy of localizing two independent, wide-band noise sources that overlap in time.
- To determine how the temporal separation of sound onsets affects the perception and localization of multiple sources.
Main Methods:
- Measured localization accuracy of two simultaneous wide-band noise sources.
- Varied the angular separation and temporal onset of the noise sources.
- Included subjects with preliminary practice in auditory localization tasks.
Main Results:
- High localization accuracy was achieved when sources were in front or behind the subject, even with a 10-degree separation from the midline.
- Perception of two distinct sources improved significantly as the time between onsets increased to 100 msec, particularly for sounds located at the sides.
- Once perceived, sounds were localized with considerable accuracy.
Conclusions:
- Temporal separation of auditory signals is a critical factor in resolving multiple sound sources.
- Auditory spatial perception, especially for sounds at the periphery, benefits from increased temporal resolution.
- Prior practice enhances the ability to localize complex auditory scenes.