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Speech intelligibility in difficult signal/noise circumstances
1ENT-Clinic, Military Hospital, Oulu, Finland.
Scandinavian Audiology. Supplementum
|January 1, 1988
Summary
Ear protectors can improve speech discrimination in noisy environments, especially at higher signal-to-noise ratios. However, performance is poor in very difficult listening conditions, regardless of protector use.
Area of Science:
- Audiology
- Occupational Health
- Speech Science
Background:
- Contradictory user reports on ear protector speech distortion exist.
- Simulating challenging auditory environments is crucial for assessing hearing protection efficacy.
Purpose of the Study:
- To evaluate the impact of ear protectors on speech discrimination under varying signal-to-noise ratios (S/N).
- To determine the effectiveness of hearing protection in difficult listening situations.
Main Methods:
- Speech discrimination tests were conducted with 52 Finnish conscripts (18-24 years) with normal hearing.
- Five distinct signal/noise ratios (S/N) were used in a soundproof room.
- Tests were performed with and without ear protectors in free-field conditions.
Main Results:
- At S/N ratios of 60/70 dB and 60/75 dB, speech perception was poor, with or without ear protectors.
- At higher S/N ratios (65/70 dB and 65/75 dB), ear protectors significantly improved word discrimination.
- At 55/70 dB S/N, discrimination was very poor, but better without ear protectors.
Conclusions:
- Ear protectors can enhance speech intelligibility in moderately noisy conditions.
- Hearing protection effectiveness varies with background noise levels.
- Further research is needed to optimize ear protection for diverse auditory environments.