Effects of Noise Level and Azimuth on Speech Perception Ability of Children with Hearing Impairment Using Cochlear Implant and Hearing AIDS
Journal Title: Journal of Medical Science And clinical Research - Year 2015, Vol 3, Issue 4
Abstract
Speech perception is a specialized aspect of a general human ability, the ability to seek and organize speech sound to central auditory system. Speech perception ability plays significant role for classroom learning special for children with hearing impairment. Daily classroom activities and background noises in schools create unfavorable context for children with HI in speech perception. Teachers in regular classroom act as moving sound source for children with hearing loss. Therefore current study aimed to evaluates the effect of noise level and direction (azimuth) on speech perception ability of children with HI using HA and CI. 50 subjects (25 HA users 25 CI users age and gender matched) were enrolled in the study with mean age range of CI subjects was 8.13 and HI subjects was 7.65. Test was performed in an acoustically sound treated two room setup. Better ear/implanted side speaker was set for giving speech input at a constant level of 60 dB whereas other side speaker used for delivering broadband noise (BBN) at different SNR(i.e. 15dB,10dB,5dB,0dB). Further to check effect of direction 0, 45, 90, 180 azimuth PB word (speech) delivered and corresponding speech perception score were recorded. Results indicate that both the group shown effect of noise on speech perception ability, increasing SNR better speech perception. Whereas higher speech perception scores seen when speech delivered at 0 azimuth and least score obtained at 180 azimuths. Statistical‘t’ tail test results showed significant difference between groups and higher score obtained by CI group. Research study suggests that both the groups adversely effected by noise on speech perception score. Therefore conclusion of study that currently used HA & CI electro-acoustic technologies are not efficient to overcome effect of noise on speech perception ability, therefore the strong need felt in the advancement of speech processing technology in HA and CI.
Authors and Affiliations
Mr. Shivraj L. Bhimte
Keywords
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