Audio signal's test in designing a cost-effective hearing aid device using a microcontroller Online publication date: Tue, 22-Mar-2016
by Muhammad Zia ur Rehman; Syed Irtiza Ali Shah; Muzzamil Javaid; Syed Omer Gilani; Umar Ansari
International Journal of Biomedical Engineering and Technology (IJBET), Vol. 20, No. 3, 2016
Abstract: A large number of hearing impaired people in rural sector of Pakistan cannot afford the high prices of digital hearing aids. Moreover, since the analogue devices amplify the speech and noise signals equally, they are not much flexible and have functional limitations. These problems can be solved with digital devices which are generally costly. In this research work, a microcontroller based cost-effective and portable hearing aid is designed and tested. The main components include sound detection circuit, microcontroller and a digital to analogue (DAC) convertor. Device is aimed to process human voice frequencies with an adjustable gain of up to 80 dB. It is tested with an input audio signal and it showed satisfactory results for low frequency signals up to 3.5 kHz which caters for the frequency range of most human voices. The system is now being developed for more effective noise suppression and broader frequency range.
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