Hearing impairment is one of the disability affecting people in the world. People find it difficult to understand speech with background noise. Investigations on speech intelligibility have demonstrated that subjects with sensorineural loss may need a 5-15 dB higher signal-to-noise ratio than the normal hearing subjects. While most defects in transmission chain up to cochlea can nowadays be successfully rehabilitated by means of surgery, the great majority of the remaining inoperable cases are sensorineural hearing impaired. Recent statistics of the hearing impaired patients applying for a hearing aid reveal that 20% of the cases are due to conductive losses, more than 50% are due to sensorineud losses, and the rest 30% of the cases are of mixed origin.
http://en.oboulo.com/speech-processing-using-wavelete-transformation-and-its-implementation-in-digital-65031.html
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