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Objective evaluation of vowel identification with the Digisonic cochlear implant

Assessed speech recognition performance (correct classification of vowels), using discriminant analysis to evaluate tuning strategies for the Digisonic cochlear implant DX10. A set of 600 vocalic items, corresponding to 10 vowel categories and produced by 20 male and female 20-40 yr old French speakers, were processed by the Digisonic DX10 with 2 different tuning strategies. In the linear strategy, center frequencies of the 15 Digisonic channels were almost equally spaced in acoustic units (Hz). In the mel strategy, center frequencies were almost equally spaced in psychoacoustic units. For each strategy, energy levels of the frequency channels were quantified for each vocalic item and processed by statistical discriminant analysis for classification into 10 vowel categories. Results mainly show that the percentage of correct classification was larger for the mel strategy, and that the improvement is due to a higher concentration of frequency channels below 4 kHz. The correct Fig. 2b is reproduced on page 346 of Vol. 35, Number 6, as Fig. 2a was duplicated. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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