Secondly, analog hearing aids use linear amplification technology, which amplifies all sounds, amplifies small sounds, and amplifies loud sounds even more, like putting an amplified speaker in the ear, which often makes the wearer feel too noisy. Prolonged use may also cause secondary damage to the hearing, the more the band the more deaf.
Professional hearing aids are digital machines that use non-linear amplification technology and have the effect of compressing the sound to reduce the noise, the human ear's hearing is divided into high-frequency, mid-frequency and low-frequency, and some people have serious high-frequency hearing loss, while others have serious low-frequency hearing loss. For different hearing loss situation can not just amplify all the sound, but should be based on the hearing loss of different frequency bands for targeted debugging. The channels in digital hearing aids will be able to compensate for the different frequency bands of hearing loss in a targeted way, realizing the natural and clear sound and making it comfortable for users to wear.
It is important to note that hearing aids are not a "commodity" that can be purchased at will.
Because of the public's weak knowledge of hearing aids, coupled with the proliferation of inexpensive analog hearing aids that do not require fitting, most people believe that hearing aids can be worn when they buy one at random. In fact, hearing aids are not a "commodity" that can be purchased at will, but rather a Class II medical device that needs to be tested and fitted according to one's hearing condition.