Hearing Aid Research Paper

1259 Words6 Pages
Digital Hearing Aid For Impaired People

(Software Based)

Arunima Sharma

Electronics and Communication

Lakshmi Narain College of Technology

Bhopal, India


Nipun Soni

Electronics and Communication

Lakshmi Narain College of Technology

Bhopal, India


Abstract— Traditional hearing aids are similar to a simple radio. They can be tuned and adjusted for volume, bass and treble. But hearing loss is not just technical loss of volume. Rather, hearing deficiency can increase sensitivity and reduce tolerance to certain sounds while diminishing sensitivity to others. For instance, digital technology can tell the difference between speech and background noise, allowing one in while filtering out the
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Surviving hair cells detect the larger vibrations and convert them into neural signals that are passed along to the brain. The microphone picks up sounds and sends them to an amplifier that makes them louder. The hearing aid will make some pitches of sound louder than others, depending on the shape of the hearing loss.

A. Noise Reduction Filter

A major anxiety for the people with hearing loss is the capability of hearing aid is to differentiate intended speech signal in a noisy environment. Hence to eliminate this noise, a noise reduction filter is used.

B. Frequency Shaper

Sometimes the hearing aid amplifies all the signals instead of the significant signal that the user wants to hear. Hence frequency shaping is carried to remove this loss. Amplitude Compression: For controlling overall gain of the system, this is to be carried out.

C. Amplitude Shaper

Fundamentally, amplitude compression function is the task of controlling the overall gain of a speech amplification system. Amplitude compression will ensure that the amplified signal will not exceed saturation power. Saturation power is where the sound signal begins to become uncomfortable.

Figure 1. Block Diagram of
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Thus, it is possible to refine the sound signal, for instance by reducing noise and improving speech signals. In addition, by using this digital technology, the amplification can be done only at frequencies that the user needs to amplify. This will eliminate the problem with conventional amplifier which amplified the whole signal including noise. In general, digital hearing aids, when the incoming signals are converted to digital signals, this digitalization makes it possible to precisely analyze and filter the signals. The signals can be processed in one or more frequency channels. At the end, the digital signal is again converted to its analog form. The benefits of using digital aids could improve quality of life by improving sound quality, higher listening comfort, better communication in noisy environment, better speech intelligibility in group conversations and more flexibility in case of progressive hearing

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