Enhancement of Speech Signals for Hearing Aid Devices using Digital Signal Processing

Abstract

Hearing loss is the major problem due to which a lot of people suffer across the world. Hearing loss occurs when someone loses the ability of hearing which may occur in any part of the ear. There are different types of hearing aid devices available to enhance the speech signals for the impaired people. In the earliest of times people often used the analog hearing aid devices which worked on the principle of using an amplifier. Analog Hearing aid amplified the incoming sound signal to the ear. Analog Hearing aid did not use any techniques to reduce the noise of the speech signals. For special solutions of individual patients were used as a digital hearing aid, which is more fitting flexibility and ability to program the hearing aids and able to adjust in different conditions rather than using the Analog hearing aids. The digital hearing aids can be programmed to match the patents hearing loss individually according to a specific frequency. The aids are programmed using the human audiogram. Digital hearing aid can be work with a very low power battery, approximately in mW. The proposed work can check noise with speech signal and observe their behavior with noise. After adding noise it removes the noise through different noise removal techniques and observes again. After the noise removal with the noise removal technique we observe again and check which technique give us a better result.