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Acosound tell you: what to do if the customized hearing aids howl?
Time:2015-09-25

The howl of the hearing aids is also called “feedback”. It is one of the most important reasons for the customized hearing aids. In fact, as long as we treat the noise problem objectively and rationally, find out the main point, it is possible that we can reduce or even avoid the feedback.

The howling of the customized hearing aids is divided into two kinds -- internal and external.

Internal howling

A simple way to check the internal howling is to block the sound output terminal to see if there is howling.
Here are some reasons for the internal howling:
1.The inner space of the hearing aid is too small, so that the components will be squeezed together. Normally the hearing aids with the inner feedback should be repaired.
2.There is something wrong with the components or wiring of the hearing aids.
3.The elements are moved by the vibration, so that cause the noise.
4.The receiver and the sound output terminal are badly connected, or the vapor enters into the inner space, then it results in the hearing aids howling.

The solutions for the inner howling: Generally speaking, internal howling is caused during the production. So it is better for us to use the receiver as small as possible and not to affect the usage of the hearing aid. And use a larger outside surface as much as possible but not to affect the aesthetic. Try to avoid the receiver and other parts of the hearing aid from the damp. We should pay attention to the shake when we use the hearing aid. And if the hearing aid need the maintenance we should send it back to the factory if necessary.


External howling
AcoSound found that the howling of about 80% of the hearing aids is caused by the external noise. But the reasons for the external noise are quite complex, so it is important to figure out the point and solve the problem.

1.The ear mode
The ear mode is the basic for the customized hearing aid. And it will directly affect the completion and comfort of the hearing aid. The worse the patients hearing loss is, the higher requirement of ears sample. The ear mode should be complete. The mode that has been repaired is surely different from the incomplete one. And if the length of the mode is not long enough, it will also cause the noise. This is because that the ear canal is not long enough, then the hearing aid will be loose for the people, and it will fall out of the canal. What’s more, it will be hard for the producer to distinguish the direction of the canal, and cause the noise.

2. The matching
In many cases that is the patient feel hearing sound gently, then increase the volume to almost full gear, resulting in the noise. Hearing aid the volume potentiometer ideal location should be between half and two-thirds, every line has its range of optional, if beyond this matching, always work under full load to hearing AIDS, and even without the noise. The service life of the hearing aid will sell at a discount greatly, therefore, we believe that when selecting a suitable model, lines and matrix proportion as enclosure is more reasonable and effective.Plus the vent is to let the patients wearing more comfortable method, but sometimes it also produce the noise, reduce even blocked vent often can immediately at this time.

3.The production
When producing sample, cutting is overmuch, waxing inequality, process after the grinding, etc are likely to affect the shell can seal.Therefore, the technical personnel's training and strict requirements are the responsibility of the manufacturer.


In the end, AcoSound hearing aid remind you: once you discover your own custom machine produce noise, must objectively and rationally treat the noise problem, and then help to check with architect or manufacturer to find out the sticking point, so the noise can reduce or even eliminate the problem.