Abstract— Ear of a human is exceedingly subtle, sympathetic and tangled organ. regrettably any harm to the ear, due to any illness, accidental injury, extreme loudly environment, some drugs or because of aging, can affect the ear to permanent damage or disability. Approximately 432 million (93%) of these are adults (242 million males, 190 million females) 34 million (7%)[3] of these are children. one-third of persons over 65 years are affected by disabling hearing loss but only few people out of this statistic use the hearing aid. Downside the ignominy associated with wearing a hearing aid due to huge size, person’s disappointment with the response of hearing aid, the cost and the battery life. At hand considering hearing impairment all over the world, it is very much obligatory to traverse new technology and idea to satisfy the need of deaf people in the society. This paper explains a detail study of deaf person’s audiogram this information can be used to process speech in digital hearing aid, we can select a filter bandwidth which is used incustomizing the hearing aid system for particular person, itcan also be used to enhance the speech quality. It also gives detail concept of different audiograms for filter used in speechprocessing in hearing aid , various filtering techniques for filter bank.