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Consonant perception with linear and compression amplification

L Hickson1, B Dodd, D Byrne

  • 1Speech and Hearing Department, University of Queensland, Brisbane, Australia.

Scandinavian Audiology
|January 1, 1995
PubMed
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Linear amplification outperformed compression for consonant perception in background noise for individuals with hearing loss. Compression amplification, particularly at a 1.3 ratio, negatively impacted speech understanding in challenging auditory environments.

Area of Science:

  • Audiology
  • Speech Science
  • Hearing Instrument Technology

Background:

  • Sensorineural hearing loss affects consonant perception.
  • Hearing aids utilize linear or compression amplification.
  • Optimizing amplification strategies is crucial for speech understanding.

Purpose of the Study:

  • To compare consonant perception using linear and two compression amplification ratios (1.3 and 1.8).
  • To evaluate performance in quiet and two noise conditions (babble, sharp intermittent sounds).

Main Methods:

  • 15 subjects with mild to moderate sensorineural hearing loss participated.
  • A modified hearing aid allowed for adjustable amplification (linear, 1.3:1, 1.8:1 compression ratios).
  • Consonant perception was assessed using the Nonsense Syllable Test (NST) in varying acoustic environments.

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Main Results:

  • No significant differences in quiet conditions.
  • Linear amplification yielded better consonant perception than compression in four-talker babble noise.
  • Linear and 1.8:1 compression showed similar performance in sharp noise; 1.3:1 compression impaired perception.

Conclusions:

  • Compression amplification may not benefit, and can sometimes hinder, consonant perception in noise for hearing-impaired individuals.
  • Linear amplification may be preferable in certain noisy listening conditions.
  • The effectiveness of compression ratio depends on the acoustic environment and noise characteristics.