الفهرس 
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Abstract
Dehqan and Scherer . (2011) compared the vocal acoustic parameters of a profound hearing loss group of boys with normal peers. Their subjects were 15 Iranian boys with profound bilateral sensorineural hearing loss and 15 Iranian normal hearing participants matched according to age and sex. The age range of the children with hearing loss was 61-81 months (M=72.26) (ie, 5.1-6.75 years, M=6.02 years) and for the normal group the age range was 61-80 months (M=71.47) (5.08-6.67 years, M=5.96 years). Each subject phonated 10 /â/ vowels with constant pitch and loudness for maximal phonation times. The mid 3-second portion of each token was analyzed using Dr. Speech 4.3u software .their results showed that there was a statistically significantly higher fundamental frequency (F0), jitter, and shimmer in the productions of the hearing loss boys compared with the normal hearing boys. Consistent with these findings was a significantly lower value for the harmonics-to-noise ratio measure for the boys with hearing loss. They suggested that profoundly deaf children present with greater phonatory instability and spectral noise, with the possible inference of reduced laryngeal control relative to vocal quality. Their finding of higher F0 for the boys with profound hearing loss suggested that they use a different control strategy for pitch.
2- The Aims of the study:
1-To investigate the acoustic voice measurements of cochlear-implants and aided profoundly- impaired school aged children based on a comparative study.
2-To use the acoustic analysis to explore changes in voice and speech for profound aided children and cochlear implanted children
3- To explore the effectiveness of the cochlear implantation versus hearing aids on perceptual and auditory abilities of the deaf children.