Tuning in the spatial dimension: evidence from a masked speech identification task
Nicole Marrone1, Christine R Mason, Gerald Kidd
1Department of Speech, Language, and Hearing Sciences and the Hearing Research Center, Boston University, 635 Commonwealth Avenue, Boston, Massachusetts 02215, USA. n-marrone@northwestern.edu
The Journal of the Acoustical Society of America
|August 7, 2008
Summary
Spatial separation of sound sources significantly improves speech intelligibility in noisy environments. This spatial release from masking is primarily driven by binaural cues and diminishes with increased reverberation.
Area of Science:
- Auditory Neuroscience
- Acoustic Signal Processing
- Psychoacoustics
Background:
- Understanding speech in complex auditory scenes is challenging.
- Spatial arrangement of sound sources influences speech perception.
- The
Purpose of the Study:
- To investigate spatial release from masking in a three-talker scenario.
- To quantify the impact of masker separation on speech intelligibility.
- To explore the role of binaural cues and reverberation.
Main Methods:
- Three-talker soundfield experiment.
- Variable spatial separation between target and masker talkers.
- Manipulation of binaural cues (earplug/earmuff) and room reverberation.
Main Results:
- Spatial release from masking increased with masker separation (8-12 dB).
- Binaural cue degradation eliminated spatial release.
- Increased reverberation reduced spatial release but did not eliminate it.
- Time-reversed maskers reduced spatial release.
Conclusions:
- Spatial separation provides significant benefit for speech intelligibility.
- Binaural cues are crucial for exploiting spatial information.
- Reverberation and masker characteristics modulate spatial release.
