Design & Development of Smart Hearing Aid for Hearing Impaired Persons
Keywords:
adaptive filter, noise cancellation, digital hearing aidsAbstract
Hearing loss occurs when the ear, particularly the cochlea, does not function properly. Hearing assistive devices are commonly used to address this issue. Although various hearing aids are available to improve speech signals for individuals with hearing impairments, many still struggle to enhance speech understanding in varying noisy environments. Commonly available hearing devices use static conventional digital filters with fixed cutoff frequencies. As a result, they failed to effectively cancel noise in environments where noise levels vary, limiting their performance in dynamic situations. To overcome these limitations, we propose an adaptive signal processing approach based on the Least Mean Squares (LMS) algorithm. The proposed solution dynamically adjusts the filter weights in response to changes in noise levels, without requiring a reference noise signal. The adaptive hearing aid system is designed to enhance speech quality in noisy listening environments, providing an improved solution for individuals with hearing impairments.