Digital Hearing Aid System With Noise Reduction And Frequency Shaper

Abstract

A great proportion of the human population suffers 
from hearing loss. Traditional analog hearing aid is 
same as simple radio. They can be calibrated and 
adjusted for volume, bass and treble. Hearing loss is 
not just a technical loss of volume. Hearing deficiency 
increases sensitivity and reduces tolerance to certain 
sounds. Hearing loss is a measure of shift in the 
auditory system compared to that of a normal ear for 
detection of a pure tone, But with the availability of 
modern-day 
technologies 
and 
the 
recent 
developments, artificial hearing aid systems can be 
designed that relax the job of damaged auditory 
systems to a great extent and make much of the sound 
available to the hearing impaired. 
In this project, the simulation of the simple digital 
hearing 
aid 
is 
developed 
using MATLAB 
programming language. The implementation of this 
configurable digital hearing aid (DHA) system 
includes noise reduction filter, frequency- dependent 
amplification and amplitude compression. Through 
this project there is- reduction of white Gaussian 
noise, increase in the gain for frequencies which 
were difficult to hear, and shape the amplitude to 
prevent any of the frequencies from becoming too 
loud.