Many elderly people will experience different degrees of hearing loss as they age, and at this time, hearing aids + can be used to assist in the collection of sound and improve the quality of life. However, now the hearing aid market is very chaotic, noise reduction technology + mature brands are few, there are many hearing aids just amplify the sound, noise reduction effect is very poor, which will affect the use of the experience, resulting in residual hearing damage, and even lead to dizziness, mental exhaustion and so on.
In fact, there will be this market phenomenon, the main reason is that people do not know about hearing aids, and do not know how to choose hearing aids. Below I will summarize some of the principles and knowledge of hearing aids, to see what you do not know.
First, the working principle of hearing aids
Hearing aids are not simple sound amplifiers, but through precision technology to convert sound signals into electrical signals, after intelligent processing and re-exported as sound adapted to the patient’s hearing needs. Its core process is divided into three steps:
- Sound pickup: the microphone converts sound waves into electrical signals. Modern hearing aids mostly use dual microphone technology, which can be directed to capture the human voice and reduce environmental noise interference.
- Signal processing: The amplifier performs targeted enhancement of the electrical signal, including high-frequency compensation (for the high-frequency hearing loss common to senile deafness), dynamic compression (to prevent excessively loud sounds from damaging residual hearing), and AI noise reduction (to separate the human voice from background noise).
- Sound Output: The processed electrical signals are converted back into sound waves by the receiver (speaker), which are delivered to the ear canal or skull through an earmold or air/bone conduction device.
The technical key to hearing aids
- Noise reduction and whistling suppression
Poor-quality hearing aids only amplify all sounds, resulting in noise mixed with speech, and even produce ear-splitting whistling (acoustic feedback). High-quality products are solved by the following technologies:
AI Dynamic Noise Cancellation: Real-time analysis of environmental sound, automatic enhancement of human voice frequencies (e.g., 500-4000Hz speech band) and suppression of background noise.
Phase offset technology: offset the whistling through the reverse acoustic wave, to avoid the “nuisance” sound interference. - Personalized fit traditional hearing aids need offline professional fitting, while modern models support APP independent fitting. Users complete the hearing test through the phone, AI algorithms to generate a personalized sound field compensation plan, and even save the “family conversation”, “square dance” and other scene modes.
Third, the use of misunderstandings and maintenance points
Common misconceptions:
“The louder the better”: excessive amplification may lead to residual hearing damage, and even cause dizziness, tinnitus.
“Wearing a hearing aid will depend on”: scientific testing and fitting of hearing aids can delay hearing degradation, to avoid the decline of the auditory center function of the brain.
Summarize the choice of hearing aids need to be combined with medical fitting and life needs, to avoid the blind pursuit of low price or appearance. A good quality hearing aid should be an “intelligent sound filter”, not just a loudspeaker. It is recommended to choose a brand that supports noise reduction and personalized tuning, and to complete a hearing evaluation in a professional institution to protect residual hearing and truly improve the quality of life.
