Effect of frequency boundary assignment on vowel recognition with the Nucleus 24 ACE speech coding strategy

Journal of the American Academy of Audiology
M S FourakisT A Holden

Abstract

Two speech processor programs (MAPs) differing only in electrode frequency boundary assignments were created for each of eight Nucleus 24 Cochlear Implant recipients. The default MAPs used typical frequency boundaries, and the experimental MAPs reassigned one additional electrode to vowel formant regions. Four objective speech tests and a questionnaire were used to evaluate speech recognition with the two MAPs. Results for the closed-set vowel test and the formant discrimination test showed small but significant improvement in scores with the experimental MAP. Differences for the Consonant-Vowel Nucleus-Consonant word test and closed-set consonant test were nonsignificant. Feature analysis revealed no significant differences in information transmission. Seven of the eight subjects preferred the experimental MAP, reporting louder, crisper, and clearer sound. The results suggest that Nucleus 24 recipients should be given an opportunity to compare a MAP that assigns more electrodes in vowel formant regions with the default MAP to determine which provides the most benefit in everyday life.

Citations

Aug 4, 2007·The Journal of the Acoustical Society of America·Kalyan Kasturi, Philipos C Loizou
Feb 23, 2012·The Journal of the Acoustical Society of America·Nathaniel A Whitmal, Kristina DeRoy
Sep 18, 2012·International Journal of Audiology·Alice E HolmesElyse Schwartz
Apr 10, 2008·The Journal of the Acoustical Society of America·Ning Li, Philipos C Loizou
Feb 24, 2015·The Journal of the Acoustical Society of America·Nathaniel A WhitmalRongheng Lin

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