Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

Analysis of Consonants Perception of Japanese 22-Channel Cochlear Implant Patients

Sotaro Funasaka, Masae Shiroma, Kumiko Yukawa

Department of Otolaryngology, Tokyo Medical College, Tokyo, Japan

Consonant confusion matrices were analyzed to deduce transfer ratios of each consonant features for Japanese 22-channel (F0/F1/F2 strategy) cochlear implantees. All patients were post-lingually deafened adults, and average scores of correct response for 14 Japanese consonants were 50% for the cochlear implant alone condition and 85% for the cochlear implant plus lipreading condition. This analysis revealed that average information transfer ratios were the highest for voicing and semivowels and the lowest for nasality in the cochlear implant alone condition, while the ratio was the highest for the place of articulation and the lowest for nasality in the cochlear implant plus lipreading condition. In addition, these results showed that information transfer ratios were improved by 25 to 35%, when aided by lipreading. Multiple regression analysis indicated that nasality and semivowels were more contributing features for consonant recognition with cochlear implant alone, and the place of articulation was most influential under conditions of cochlear implant plus lipreading.

Full Paper

Bibliographic reference.  Funasaka, Sotaro / Shiroma, Masae / Yukawa, Kumiko (1994): "Analysis of consonants perception of Japanese 22-channel cochlear implant patients", In ICSLP-1994, 2107-2110.