In this paper we present the first evaluation results of a carefully designed piecewise linear frequency compression curve, to improve the recognition of fricative consonants, for patients with high-frequency dead regions in the cochlea. Our original frequency compression/transposition algorithm takes into account the average short-time spectrum of the most frequent Brazilian Portuguese fricatives. A specific speech material, composed by twenty four different monosyllables spoken by eight speakers (four male and four female), was recorded for a consonant discrimination test. The algorithm was tested over ten normal hearing listeners with simulated dead regions above 1500 and 2000 Hz. One-way and two-way ANOVA results have shown a statistical significant improvement in the correct identification of fricatives in initial syllabic position.
Bibliographic reference. Fraga, Francisco J. / Prates, Leticia P. Costa S. / , Maria Cecilia M. Iorio (2) / Iorio, Maria Cecilia M. (2008): "Frequency compression/transposition of fricative consonants for the hearing impaired with high-frequency dead regions", In INTERSPEECH-2008, 2238-2241.