Abstract
The most common complaint about Digital Hearing Aids is feedback noise. Many attempts have been undertaken in recent years to successfully reduce feedback noise. A wiener filter, which calculates the wiener gain using before and after filtering SNR, is one technique to reduce background noise. Modified Noise Reduction Method (MNRM), a new way for reducing feedback noise Reduction, is presented in this work. In the Modified Noise Reduction Strategy, the advantages of a wiener filter are merged with a decision-directed approach and a twin-stage noise suppression technique The Modified Noise Reduction method can reduce the noise more successfully, according to comprehensive MATLAB programming, investigation, and findings analysis. After being modelled in MATLAB for seven distinct noise types, the SNR of the two architectures is compared.
Highlights
The main purposes of DHA is to give frequency dependent amplification to persons who are deaf or hard of hearing
The advantages of contemporary sub band domain digital hearing aid systems were explored by Ashutosh et al (2011) [1,2]
To compensate for hearing loss in digital hearing aids, the filter bank channel gains must be changeable over a wide dynamic range[10,11].In Biological basic DHA contain two channel,the first channel includes a directional unit for receiving the acoustic input signal and providing a directional signal; a correlative unit for receiving the directional signal and providing a noise reduced signal [12,13].Compare to 16 point TAP wiener filter,32 point TAP wiener filter cancels 17db noise [14]
Summary
The main purposes of DHA is to give frequency dependent amplification to persons who are deaf or hard of hearing. Because digital hearing aids require frequency dependent amplification, sub band domain signal processing is a preferable option. In today's sub band domain Digital Hearing Aids, the wiener filter is employed to reduce noise [3]. Adaptive filters in modern sub band DHA use block transformations like as DFT, GDFT. To compensate for hearing loss in digital hearing aids, the filter bank channel gains must be changeable over a wide dynamic range[10,11].In Biological basic DHA contain two channel ,the first channel includes a directional unit for receiving the acoustic input signal and providing a directional signal; a correlative unit for receiving the directional signal and providing a noise reduced signal [12,13].Compare to 16 point TAP wiener filter, point TAP wiener filter cancels 17db noise [14]. A Wiener filter is used to reduce noise in most improved sub band domain digital hearing aids [7,8].
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