The lifestyle of any person depends on his ability to hear his surrounding sounds or voices. This is because each of our sense organs works interrelated. Without an ability to proper hearing, he/she cannot respond to the other person leading to a very less or no communication to the society. Although he has a good talent and knowledge within, he cannot be able to communicate or express unless he has a good hearing ability. Also, he faces emotive problems caused by a reduction in self-confidence. So, a requirement of designing an efficient hearing aid is much necessary to resolve the hearing loss problem. In this paper, design of an efficient alterable ten band Finite Impulse Response filter bank for the hearing aid is achieved. Among the various windowing techniques available, Hamming window is preferred to design the FIR filter owing to its relatively sharp main lobe width and also the first few lobes have good attenuation. In this filterbank, variability in the subband bandwidths is achieved by simply altering each subband's bandwidth and center frequency. Unlike fixed filterbank, the proposed design provides the advantage of matching most of the audiograms of different hearing-impaired persons more accurately with simple procedure leading to low cost and low hardware complexity. Also using an FIR filter in the filterbank leads to highly stable design. Thus, a design of highly qualitative filterbank compared to fixed bandwidth designs with high audiogram matching and less matching error is implemented.

Hearing is one the most important sense organs of any human being. It connects the people to the environment around them. Hearing aids provide an opportunity for the hearing disabled people to listen to the environment. However design of a qualitative hearing aid with low cost enables more number of people to utilize the hearing aids for their bright life. Although there are several hearing aid filterbank designs available, it has constraints towards quality, cost, delay and reconfigurability. In this paper a qualitative filterbank design is proposed that has low matching error which leads to good audiogram matching. The proposed design has reduced number of multipliers using half band FIR filter. This reduces the hardware complexity as well as cost of the hearing aid. Also the proposed method is implemented with parallel processing of low pass and high pass bands leading to reduction in the delay to receive the sounds by hearing aid. This avoids interference between speech and visual integration of lip movement. Reconfigurability of the design is one of the important aspects that help in designing the filterbank with different number of bands in different regions (Low pass, High pass and Band pass regions) as well as with different bandwidths. This provides an advantage of using the same filterbank design for different audiograms with different levels of loss in hearing without changing the filter structure.

Now a days hearing impairment has become the most common problem throughout the world. WHO (World Health Organization) 2021 analysis states that around 430 lakh people that is more than five percent of world’s population require rehabilitation to their hearing loss disability. Without proper hearing one cannot have a good communication with the society that may have impact on his career and life. Therefore, a need for good hearing aid to solve the problem of hearing impairment is very much required. In this paper we have designed a hearing aid filterbank with eight different subbands whose bandwidths can be varied according to hearing impaired person audiogram. By varying the central frequency and bandwidth of each subband we can vary their bandwidth. This variable bandwidth implementation has the advantage of obtaining more precise matching with the hearing-impaired person audiogram and hence least matching error is obtained. With this design we can provide a more qualitative hearing.

In the case of sensorineural hearing loss, the hearing aid needs to amplify the audio signal selectively based and frequency and very sensitively based on the hearing threshold. In this paper, we proposed to implement a new 16-point Discrete Cosine Transform (DCT) base delay efficient algorithm for hearing aid applications. This proposed algorithm gives better matching error with smaller delay due to uniform resampling and recursive modification of hearing thresholds in an audiogram. Delay and matching error are the main parameters in analysing the performance of the hearing aid algorithm. Four audiograms with various degrees of hearing loss are used to test the suggested method. When compared to filter bank approaches, the suggested algorithm has a lower matching error and a faster response time. The proposed algorithm is implemented on a TMS320C5505 DSP processor to validate the simulation results.

A hearing once lost cannot be regained naturally. One of the solutions to this problem is using of Hearing Aids. In this paper we are mainly concentrating on the solution for hearing loss in aged people (presbycusis). High frequencies are mainly affected in Presbycusis. In this paper we are going to implement Digital Filter Banks with non-uniform subbands so that we can adjust the gains precisely by referring to the particular audiogram. Here we are going to choose narrow/wide bands if there is a large/narrow variance of intensity of hearing loss in a narrow/wide band variance. This helps in precise gain adjustment leading to a good audiogram matching and hence less matching error. This is a major advantage in treatment of Presbycusis as high frequencies are majorly affected than low frequencies. This process helps in reducing the number of bands which leads to low complexity and cost. Thus, we can achieve a low cost and efficient hearing aid for elderly people. Audiograms with different degrees of hearing loss (Mild, Moderate, Mild to moderate and Severe) are chosen, and matching error is compared between the existing methods, proposed uniform, and non-uniform digital filter banks. The results have shown that the proposed method gives lower matching error values leading to an efficient hearing aid.