4.5 Article

Spectral peak resolution and speech recognition in quiet: Normal hearing, hearing impaired, and cochlear implant listeners

Journal

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 118, Issue 2, Pages 1111-1121

Publisher

ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.1944567

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Funding

  1. NCRR NIH HHS [RR00059] Funding Source: Medline
  2. NIDCD NIH HHS [1R01DC000377] Funding Source: Medline

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Spectral peak resolution was investigated in normal hearing (NH), hearings impaired (HI), and cochlear implant (CI) listeners. The task involved discriminating between two rippled noise stimuli in which the frequency positions of the log-spaced peaks and valleys were interchanged. The ripple spacing was varied adaptively from 0.13 to 11.31 ripples/octave, and the minimum ripple spacing at which a reversal in peak and trough positions could be detected was determined as the spectral peak resolution threshold for each listener. Spectral peak resolution was best, on average, in NH listeners, poorest in Cl listeners, and intermediate for HI listeners. There was a significant relationship between spectral peak resolution and both vowel and consonant recognition in quiet across the three listener groups. The results indicate that the degree of spectral peak resolution required for accurate vowel and consonant recognition in quiet backgrounds is around 4 ripples/octave, and that spectral peak resolution poorer than around 1-2 ripples/octave may result in highly degraded speech recognition. These results suggest that efforts to improve spectral peak resolution for HI and Cl users may lead to improved speech recognition. (C) 2005 Acoustical Society of America.

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