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Analog Hearing Aids

Definition :

An analog signal is one in which a base carrier's alternating current frequency is modified in some way, such as by amplifying the strength of the signal or varying the frequency, in order to add information to the signal.

An analog signal can be represented as a series of sine wave s. The term originated because the modulation of the carrier wave is analogous to the fluctuations of the human voice or other sound that is being transmitted.

A nominally continuous electrical signal that varies in amplitude or frequency in response to changes in sound, light, heat, position, or pressure.

Analog Processing:

Analog technology has been around for decades. It's not that complicated a concept and it's fairly inexpensive to use.

It is the process of taking an audio or video signal (in most cases, the human voice) and translating it into electronic pulses.

Analog Hearing Aid:

An analog hearing aid employs miniature devices, such as microphones, amplifiers, and resistors to alter an acoustic signal (a sound) electronically. The altered signal is then converted back to a sound wave and played into the ear canal.


Analog aids can be quite sophisticated and have many important features, so thery may still be good options for many people with hearing loss.

Analog aids may still be very suitable solutions for many peoples' hearing aid needs.

Least expensive type of hearing aid today.

Some are programmable for different environments and can be programmed for changing levels of hearing loss.

Make sounds loder but not discriminate among them.


Analog is not very good, they whistle with all the background noises it picks up, its impossible to communicate with someone in a noisy place!

Analog aids don't typically have as many adjustments or settings, but if fit well, they can be a very good hearing aids.

Analog system has noise i.e. random variations. As the signals copied and re-copied or transmitted over long distances these random variations become dominant.

Digital Programmable Computerised Hearing Aid


Digital on the other hand generates, stores, and processes data in terms of two states: positive and non-positive. Positive is expressed or represented by the number 1 and non-positive by the number 0. Thus, data transmitted or stored with digital technology is expressed as a string of 0's and 1's. Each of these state digits is referred to as a bit.

Digital Processing:

Digital processing means faster response times and more accurate sound filtering

Digital processing converted the sound itself from analog to digital, processed it in digital form and converted it back into analog for the eardrum.

Digital Hearing Aid:

A digital hearing aid is a hearing aid device that receives sound and digitizes it (breaks sound waves up into very small, discrete units) prior to amplification.

A digital hearing aid uses a microphone, but a microprocessor performs most of the device's functions digitally. Because the signal is represented as a series of numbers, it can be quickly and accurately altered.


  • Convert sound to digital signals.
  • Programmable and Non Programmable both types are available .
  • A digital hearing aid can be programmed to adjust itself to the current environment millions of times each second
  • Can distinguish between noise and speech. Can suppress background noise so a person can hear speech better.
  • The most sophisticated digital hearing aids have built in intelligence that allows them to discern between soft, but desirable sounds, and louder, but unwanted noise


  • More expensive

Special Hearing Aid Devices 

Following hearing aids are used for specific purpose only.

  • Spectacle hearing aid 
  • Tinnitus Masker
  • CROS hearing aid.

I.I.C. - Invisible

C.I.C. - Canal



I.T.C. / I.T.E