Abstract
About 5% of the total population of world has hearing impairment and this is 6.3% in India.The hearing impairment in patients can be corrected by using a hearing aid or cochlear implant (CI) .Hearing aid is a traditional way while CI, which is surgically implanted, is a modern way to correct the hearing impairment. In comparison to hearing aids CI increases speech intelligibility at a greater level. Also speech intelligibility decreases in noise though acceptable in noise-free environments. With the advancement of technology over past decades, it shows increase in speech intelligibility with new emerging speech coding strategies. In this paper the basic speech processing strategies for speech coding and different techniques and algorithms, which aimed to increase the speech intelligibility, are being reviewed. Speech will be analyzed based on some measures like Analysis of Variation (ANOVA), Root Mean Square Error (RMSE) etc. The focus will be on speech perception and intelligibility enhancement.
Highlights
In human auditory system, the sound waves collected by ear, travel from outer ear through the auditory canal and strike the eardrum causing it to vibrate
Speech perception enhancement by increasing speech intelligibility using cochlear implant (CI) is a research area which haven potential to change the lives of millions of people
Improving speech coding in CI is a promising area in this field
Summary
The sound waves collected by ear, travel from outer ear through the auditory canal and strike the eardrum causing it to vibrate. The central part of the eardrum connected to small bones of middle ear and because of this connection it transmits the sound waves to other small bones This action is passed on to cochlea, having spiral structure, contains receptor organs for hearing. The severity of hearing loss increases over time as the hair cells keeps on corroding over time and in noisy environment Due to this corroding, speech intelligibility may not be achieved by conventional hearing aids so, CI is used. This, an electronic device, is surgically implanted under the skin of the patient It helps hearing impaired patients having severe to profound deafness to gain speech intelligibility by simulating the normal hearing process by stimulating auditory nerves electrically[2], helping in communication and language development in children. This paper is divided into six parts including introduction, a brief discussion on factors associated with CI, followed by a brief explanation of sound processing strategies, Sound production analysis, comparison and conclusion
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