Is a hearing aid an amplifier?
Many people think that the hearing aid is just an amplifier. Indeed, the original design principle of the hearing aid is a loudspeaker. Do you feel that the sound is getting louder when you roll your palm into an arc and then put it behind your ear back? Bell, who originally made hearing aids, was inspired by this.
For that sentence, a hearing aid is an amplifier. If it was put decades ago, it was true, but now it is not. Today’s hearing aids are basically digital hearing aids, which are high-precision electronic products. Today’s hearing aids are mainly composed of: microphone, receiver, amplifier, inductor, compressor, peak clipping, etc.
Why do I say that the current hearing aids are basically digital hearing aids? Because in the market, about 5% – 10% of hearing aids are analog hearing aids, and analog hearing aids are basically similar to amplifiers. The traditional analog hearing aid belongs to linear amplification, which can amplify the light, medium and heavy sounds equally. Therefore, the deaf patients who wear the analog hearing aid are likely to have the phenomenon that they can’t hear clearly in a low voice and listen loudly. If they wear this kind of hearing aid for a long time, it may cause further hearing loss, thus aggravating the degree of hearing loss.
Digital hearing aids are designed to define different environments, automatically reduce noise, compression ratio and other characteristics, which happens to avoid the phenomenon that the analog hearing aids can not hear clearly in low voice and listen loudly.
Digital hearing aid relies on the powerful computing technology of computer chip, which can automatically select different calculation formulas to calculate different compensation curves according to different hearing loss degree and age of users, so as to meet the needs of patients’ listening ability to the maximum extent.
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