After wearing the hearing aid, even if the switch has not been turned on, some people will feel that they have echoed their voices, and they are as if they are talking in a wooden barrel. This is because the ear mold (including the custom-made hearing aid housing) closes the external auditory canal, and the sound of the self-talk is transmitted through the middle ear and the skull, causing the vibration of the external auditory canal cartilage. Under normal circumstances (without hearing aids) the external auditory canal is open, and this vibrational energy is released without being noticed. When the external auditory canal is closed by the ear mold, this part of the energy is left in the external auditory canal, thereby causing the above phenomenon. This can also happen if a normal person blocks the ear canal with a finger or something. This phenomenon is called “cuffling effect” in medicine.
It can also be explained from another angle: we always feel “weird” about the voices of our own voices in the recorder, but others do not think. Why? Because under normal circumstances, we listen to ourselves, both the “air conduction” component that passes from the mouth to the inner ear through the outer ear, and the “bone conduction” component that is transmitted directly to the inner ear through the vibration of the skull. When listening to the recording, we can only hear the “air conduction” component, but can not hear the “bone conduction” component. Under normal circumstances, the air conduction and bone conduction components are balanced, and we have become accustomed to it. If you wear a hearing aid, the “bone conduction” component suddenly strengthens, and it sounds like an echo.
This is more obvious in custom-made hearing aids. Generally, we can solve this phenomenon by making vent holes on the custom machine, but sometimes we should pay enough attention to the optional appearance for the more serious plugging effect.
Jinghao medical hearing aid reminder: hearing aids need to be professionally “fitted”, it is very important to choose a professional hearing aid fitting center and hearing aid fittings! All patients and friends have any hearing problems can call the Jinghao medical consultation, or personally Come to the fitting center experience. Hearing aid free consultation phone: +86-18566295705
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