How hearing AIDS work

A hearing aid is a small loudspeaker for people with hearing loss to receive and amplify surrounding sounds and feel sounds.

Sound is produced by the vibration of objects. Sound is simply the movement of pressure waves through the air, which vibrate the small bones in the inner ear (ossicles), and these vibrations are converted into tiny electronic brain waves, which are the sounds we can perceive. Microphones use the same principle as the inner ear to capture sound waves or the sound of speakers. Naturally, when the sound is turned down, moving slowly, and loud enough, we can actually "feel" the vibrations of the air pressure waves.

Since the beginning of the 20th century, the structure of electronic hearing AIDS has not changed much, but the volume of various parts of the hearing aid has gradually decreased, the sound quality has gradually improved, and there is more selective control. A hearing aid is a device that AIDS hearing, which is mainly composed of a microphone, an amplifier, a headset, a power supply and a volume control.

1. Microphone collect sound: The microphone of the hearing aid will receive the surrounding sound, including speech, music, etc. At present, some hearing AIDS can be configured with positioning microphones, which can receive the sound from the setting Angle, and some excellent hearing AIDS can even automatically locate and identify the noise, and automatically shield it, greatly improving the processing capacity of noise.

2. Sound signal conversion: The microphone converts the received sound into an electrical signal.

3, signal amplification and processing: the received electrical signal will be amplified by the amplifier to increase the volume of the sound. Amplifiers can be adjusted according to the needs of users to meet different hearing requirements, the price difference of hearing AIDS is mostly displayed through this step, most of the hearing AIDS sold on the market are just sound amplifiers, sound amplifiers will simply unify all the sounds together to amplify, suitable for use in a quiet and simple environment. Compared with sound amplifiers, digital hearing AIDS can select and process sound, partition different requirements for sound processing, and the processing of noise will be more prominent.

4, sound output: the amplified signal will be sent to the speaker, and then the speaker will output the sound to the user's ear.

5, adjustable function: Some hearing AIDS also have adjustable functions, such as volume control, background noise suppression and frequency adjustment, so that users can adjust according to different hearing environments.

Conversion of sound signal:

There are currently several types, but their functions and principles are the same. (1) From the external structure can be divided into box type, earback type and ear type, ear type can be divided into ordinary ear type, ear canal type and deep ear canal type. (2) The electronic principle can be divided into: analog hearing AIDS; Programmable hearing AIDS, full digital hearing AIDS, wide dynamic language technology hearing AIDS, etc. (3) Hearing AIDS can be divided into air guide hearing AIDS and bone guide hearing AIDS according to the conduction mode. Box type, behind the ear type and inner ear type are air guided hearing AIDS.

In general, hearing AIDS help people with hearing loss improve their hearing ability by collecting sound, converting signals, amplifying sound and delivering it to the ear. This hearing aid provides a better hearing experience for people who are impaired due to age, disease or other reasons.