Hearing aid is a small loudspeaker, which can enlarge the sound that can not be heard originally, and then use the residual hearing of the deaf to make the sound sent to the hearing center of the brain and feel the sound. Sound is produced by the vibration of an object. It is the source of an object’s sound. Sound is just the movement of pressure waves through the air. The pressure waves vibrate the small bones in the inner ear (auditory ossicles). These vibrations are transformed into tiny electronic brain waves, which are the sounds we perceive. The inner ear uses the same principle as a microphone to capture sound waves or the sound of a loudspeaker. It is the relationship between the moving mechanical part and the air pressure wave. Naturally, when the sound waves are low pitched, slow moving and large enough, we can actually “feel” the vibration of the air pressure waves. Hearing aid is a small loudspeaker, which can enlarge the sound that can not be heard originally, and then use the residual hearing of the deaf to make the sound sent to the hearing center of the brain and feel the sound. It is mainly composed of microphone, amplifier, earphone, power supply and volume control. Hearing aids can be divided into air guided hearing aids and bone guided hearing aids according to the way of conduction; they can be classified into box type, glasses type, hairpin type, ear back type, inner ear type, ear canal type and deep ear canal type according to the way of use. Since the beginning of the 20th century, the structure of electronic hearing aid has not changed much. It is still composed of microphone, amplifier, receiver and power supply. However, the volume of each part of the hearing aid is gradually reduced, the sound quality is gradually improved, and there is more selective control. 1) Microphone: collects sound and converts it into electrical waves. 2) Amplifier: increase the intensity of the electric wave. 3) Receiver: just opposite the microphone, turn the increased electric energy back to sound wave. 4) Power supply: small battery. 5) Enclosure: protects internal structure. At present, there are several types, but their functions and principles are the same. (1) From the external structure, it can be divided into box type, ear back type and ear inner type, while ear inner type can be divided into ordinary ear inner type, ear channel type and deep ear channel type. (2) The electronic principle can be divided into: analog hearing aid; programmable hearing aid, full digital hearing aid, wide dynamic language technology hearing aid, etc. (3) According to the conduction mode, hearing aids can be divided into air guided hearing aids and bone guided hearing aids. The box type, the ear back type and the inner ear type are all air guided hearing aids.
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