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Clear speech perception in acoustic and electric hearing
Sheng Liu1, Elsa Del Rio, Ann R Bradlow
1Hearing and Speech Research Laboratory, Department of Biomedical Engineering, University of California, Irvine 92697, USA. sliu@uci.edu
The Journal of the Acoustical Society of America
|November 10, 2004
Summary
Speaking clearly enhances speech intelligibility for individuals with hearing loss. Clear speech, characterized by slower rates and higher amplitude modulations, improves speech recognition, especially in noisy environments.
Area of Science:
- Audiology
- Speech Science
- Acoustic Phonetics
Background:
- Clear speech production can improve speech intelligibility for listeners with hearing loss.
- Acoustic differences between clear and conversational speech are well-documented.
Purpose of the Study:
- To analyze acoustic properties of clear speech.
- To measure speech intelligibility in acoustic and electric hearing.
- To investigate the role of temporal amplitude modulations in clear speech intelligibility.
Main Methods:
- Acoustic analysis of clear and conversational speech.
- Speech intelligibility testing across various signal-to-noise ratios.
- Simulation of cochlear implant processing by manipulating speech fine-structure.
Main Results:
- Clear speech exhibited slower rate and higher temporal amplitude modulations than conversational speech.
- Clear speech yielded higher intelligibility across tested conditions.
- A 3-4 dB advantage for clear speech was observed even with simulated cochlear implant processing.
Conclusions:
- Temporal amplitude modulations in clear speech contribute significantly to its intelligibility advantage.
- While temporal fine structure is crucial for speech recognition, the temporal envelope plays a key role in the benefits of clear speech.
- Findings have implications for speech processing strategies in hearing aid and cochlear implant technologies.