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Speech signal modification to increase intelligibility in noisy environments
Sungyub D Yoo1, J Robert Boston, Amro El-Jaroudi
1Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
The Journal of the Acoustical Society of America
|August 4, 2007
Summary
Transient speech components significantly boost speech intelligibility, especially in noisy environments. Amplifying these transient elements enhances word recognition, offering a new strategy for improving communication clarity.
Area of Science:
- Acoustics
- Speech Processing
- Psychoacoustics
Background:
- Speech intelligibility is crucial for effective communication.
- Understanding the contribution of different speech components to intelligibility is essential for developing assistive technologies.
- Previous research has focused on steady-state speech characteristics, with less attention paid to transient elements.
Purpose of the Study:
- To investigate the role of transient speech components in speech intelligibility.
- To determine if amplifying transient speech components can improve speech perception in noise.
- To compare the intelligibility of modified speech with amplified transients against original speech under varying noise conditions.
Main Methods:
- Speech was decomposed into quasi-steady-state (QSS) and transient components using time-varying filters.
- The energy and intelligibility of each component were compared to original speech.
- A modified speech signal was created by amplifying the transient component and then tested using a modified rhyme protocol in background noise.
Main Results:
- The transient component, despite lower energy, was nearly as intelligible as original speech.
- The QSS component contained most of the speech energy but had low intelligibility.
- Modified speech with amplified transients showed significantly higher word recognition rates at low signal-to-noise ratios (SNRs) compared to original speech.
Conclusions:
- Transient speech information is critical for speech perception.
- Amplifying transient components can enhance speech intelligibility, particularly in challenging noisy environments.
- This approach holds promise for improving communication for individuals with hearing impairments or in adverse listening conditions.
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