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Learn How Hearing Aids Work

Posted on | August 5, 2011 | No Comments

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When a person is faced with cochlear damage, and the resulting sensorineural hearing loss, a hearing aid prescribed by an Audiologist is often their best bet at reclaiming their auditory function. If prescribed, the hearing aid will function by boosting audible sound. The aids today are typically small acrylic devices that fit inside the ear and imbedded with tiny components and a battery. The most important of these, for the function of the aid, are the microphone, computer chip, amplifier, and mini-speaker.

The process begins with the microphone, with is a transducer, and changes energy to different forms. In this case, the energy enters in the form of sound waves and is transduced into electrical energy. Microphones make this possible through the use of a diaphragm, which is a thin material that vibrates once struck by sound waves.

Once sound waves are transferred to electrical energy by the microphone component; the computer chip begins the task of analyzing the raw data into a usable form. Acting as the brains of the operation, the computer chip determines the appropriate corrections to be made, relative to the pitch and volume of the incoming signal. It then sends the corrections, calculated from the prescription, to the amplifier for processing.

After receiving the directions, the amplifier goes to work elevating the energy level of the signal. This boost is mandatory for two reasons. Primarily, the person suffering from the hearing loss needs heightened auditory wave energy in order to hear properly. In addition, the cone of the speaker, which outputs the wave energy, requires more power to operate than the simple diaphragm located in the microphone. In completing its task, the amplifier relies on its battery powered transistor to increase the power and effectiveness of the processed electrical energy.

The final step in the hearing aid process involves converting the electrical energy back into usable sound waves. This function is accomplished through a speaker, which is also a transducer, but works in the opposite manner of a microphone. The speaker utilizes an electromagnet, which is moved away from a fixed magnet according to pulses in the electrical energy. This movement then produces a vibration of sound waves, resulting in audible sound.

In conclusion, hearing aids serve an important function in raising the standard of living for those suffering from hearing impairments. To do this, hearing aids transfer sound waves into energy, evaluate and heighten the signal, and then convert the energy back to sound waves. The end result features components working in tandem to produce amplified sound waves for the benefit of the user.

Now Try – Digital Hearing Aids

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