April 15, 2009

A Little on How Hearing Aids Work

by Lindelwa Laz

It is true that hearing aids have existed for decades, though simple conical devices were the first hearing devices. Through the funnel, the sound would be amplified directly into your ear. Anyone can tell you that our current hearing devices take advantage of much greater technology, but many do not realize just how that technology works.

Hearing aids use small microphones to make a soft sound louder: this is achieved by using a small microphone. First, as the device gets the sound, it is converted to electrical or digital signals, then it is reconverted back to sound as it is sent to a speaker. The exact settings for the microphones will depend upon the degree of a person's hearing loss and their typical environment. The type and level of noise is the meaning of environment in this case. A person who needs to hear high frequency noises will need to have a different setting than a person who is constantly exposed to a conversational environment, for example. It is true that this device is very important and all of these factors will help your audiologist come up with the right setting for it, however, this does not begin to explain entirely how these devices work.

The hearing aids require three types of technology to make the receiving of signals - and the conversion - happen! The least and advanced technology and the least expensive type go hand in hand: this is the analog adjustable. This particular type can be adjusted by the wearer's audiologist. After the factory custom makes it for you, you will have the option to control the volume manually or automatically.

Through the analog programmable is another way the hearing aid works. These are somewhat better than the analog adjustable because they can be programmed using a computer. It is programmed by the audiologist: he or she will program in various types of sound capture and transmission possibilities. The programs can be selected at any point by the user with a provided remote control. The most advanced and most expensive models are digital programmable devices. In the past, they were alternately impossible and too big to be practical but this has changed in recent ears.

DSP, or Digital Sound Processing, is a circuitry found in hearing aids. The way this works is by having a computer chip which then processes the sound before it gets analyzed in the ear. These sounds are then assigned the correct settings based on the type of sound that they are. At this point, the data is changed back into sound, as it gets sent through the ear. This process rarely requires any adjustment from the wearer.

Hearing aids have come a long way in a short time, especially in recent years. People who need them have much better options. The answer to 'how do hearing aids work' is simple - technology!

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