The structure of our hearing aids generally includes microphones, amplifiers, receivers, inductors, batteries, and function adjustments.
Its function is to convert sound waves into electrical signals. Simply speaking, only the microphone receives the sound and converts it into an electrical signal. The hearing aid can play its performance to process the sound. The digital signal is obtained by calculation and sampling. The higher the sampling rate, the sound. The degree of reduction will be higher.
This can be analogized to usKTVThe microphones when singing are divided into omnidirectional microphones and directional microphones according to their functions.
Omnidirectional microphone: Receives sound from all directions with the same sensitivity. The advantage is that360° No dead ends to receive ambient sound, now omnidirectional microphones have begun to have the ability to distinguish the front and rear direction. In a relatively quiet environment, the use of an omnidirectional microphone allows the user to hear more sound and improve the adaptability to the entire environment.
Directional Microphone: Consists of two or more performance-matched microphones that only receive sound from a particular direction, and sounds in other directions are suppressed.
Advantages: Improve signal-to-noise ratio by reducing noise input and improve speech resolution in noisy environments. All major hearing aid manufacturers are using directional microphones, such as high-precision locators, peak stereo focusing, speech azimuth focusing, and special zoom directionality relying on directional microphones. Other manufacturers also have applications, but the name is different.
Disadvantages: Suppressing sounds in other directions in the environment may result in the loss of important verbal information. In addition, after all, it is machine identification, and the automation ability is limited. It just meets most of our needs, and everyone must have a correct understanding of hearing aids.
After the sound signal is received by the microphone and converted into an electrical signal, it is sent to the signal processing part of the hearing aid for processing, that is, the amplifier performs amplification, filtering, and the like. To give an inappropriate example, the amplifier is equivalent to being with us.KTVThe singing station when singing is used to process and calculate sound.
The function is to convert the electrical signal processed by the amplifier into sound waves and transmit it to the ear. Equivalent to what we areKTVWhen the sound is sung, the receiver of the hearing aid is very small, and the sound outlet is also very small.
Most of it is now zinc–Empty battery, according to the size from small to large10号、312号、13号、675Number four models.
Domestic brands are more common, to the engine, the engine, and the Swiss brand. The imported brands are mainlyPower one.
Lithium batteries have also begun to appear, and rechargeable batteries are now available. I would like to introduce to you that lithium batteries are similar to our mobile phone batteries. They are rechargeable batteries. 3 hours can be used continuously for 24 hours. Each battery can be 1500 times or more. It can be used for 4 years. A trend in the development of hearing aid batteries will be more widely applied later.