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Comparison of two speech processing schemes using normal-hearing subjects.

Y C Tong1, J M Harrison, J Huigen

  • 1Department of Otolaryngology, University of Melbourne, Parkville, Victoria, Australia.

Acta Oto-Laryngologica. Supplementum
|January 1, 1990
PubMed
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The Filter-bank (FB) scheme, using four spectral components, improved consonant perception in noise compared to the zero-crossing (ZC) scheme with two spectral components in normal-hearing subjects.

Area of Science:

  • Audiology
  • Speech Science
  • Signal Processing

Background:

  • Speech processing schemes are crucial for speech perception studies.
  • Real-time laboratory speech processors enable detailed perceptual investigations.

Purpose of the Study:

  • To compare the efficacy of two distinct speech processing schemes: zero-crossing (ZC) and Filter-bank (FB).
  • To evaluate their impact on speech perception in normal-hearing individuals.

Main Methods:

  • Implementation of ZC (two spectral components) and FB (four spectral components) schemes on a laboratory speech processor.
  • Perceptual studies involving 4 normal-hearing subjects with cross-over training and testing on both schemes.
  • Assessment of vowel and consonant perception, open-set word recognition (CNC), and speech tracking.

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Main Results:

  • Vowel perception was similar between the ZC and FB schemes.
  • Consonant perception in noise was significantly better with the FB scheme across various signal-to-noise ratios (5-20 dB).
  • Open-set word recognition and speech tracking scores favored the FB scheme.

Conclusions:

  • The Filter-bank (FB) speech processing scheme demonstrates superior performance over the zero-crossing (ZC) scheme for consonant perception in noise.
  • FB scheme offers enhanced speech intelligibility, particularly in noisy listening conditions.
  • These findings have implications for developing advanced auditory aids and speech processing technologies.