Howling has always been a major cause of dissatisfaction among hearing aid users, and it is also one of the most difficult problems for hearing aids when it comes to hearing aid debugging.When hearing aids are repaired, the whistling problem of the customized machine has always been one of the main reasons that affect the satisfaction of patients and dealers with the customized machine. In fact, as long as we treat the whistle objectively and rationally to find the crux of the problem, It is not impossible to reduce or even avoid howling.
1. The main reasons for the internal whistling of the hearing aid are: the internal space of the hearing aid is too small, so that the components are squeezed together, and it is easy to self-excite and generate whistling. Hearing aids with larger receivers are more common; the relative position of the internal components of the hearing aids is not good; the internal components are displaced due to vibration; the size of the customized machine is too small The microphone and the receiver are too close to transmit feedback through vibration; the receiver and the sound tube are not connected So wait.The reasons for the formation of positive feedback on the circuit are: poor insulation between components, moisture entering the inside of the hearing aid and causing leakage, internal wires not being arranged properly, and unreasonable circuit design.Many internal squeals are generated during production, which can be found by factory inspection, and generally will be resolved within the factory.The usual solutions are: use a smaller receiver without affecting the effect of the hearing aid; appropriately increase the volume of the housing and keep the microphone away from the receiver without affecting the appearance of the hearing aid; re-adjust the relative position of the components; The receiver has better anti-vibration protection; reduced power, etc.
In short, there are many reasons for howling in customized machines, from taking ear samples, selecting lines and matrices, to making, and finally to debugging and wearing. If each link is not handled well, it may produce howling. Only grasp well. Every detail can satisfy the patient as much as possible and increase the success rate of matching.
