Annoying hearing aid crackle
One of the problems that customers often give us after using hearing aids is that the hearing aids make a chirping sound when they are not in use, when they are placed on the table, when they are just inside the ears, or when the earplugs of the behind-the-ear machine are not worn properly, too big or too small, too loose or too tight. What should we do in this case?
The reason why my hearing aids crackle
First of all, this chirping sound is called “whine” or “feedback” in audiology. There are two types of acoustic feedback – one is feedback generated internally by the hearing aid. This feedback indicates that the hearing aid needs to be adjusted; the other is the external whine, which is more common. External whine is caused by sound leakage. The leaked sound is picked up and re-amplified by the hearing aid because it is closer to the hearing aid, creating a loop and thus causing feedback. It is the same principle as the ear-piercing screeching sound we get when we accidentally point the microphone at the amplifier while singing karaoke. When you take off or put on your hearing aid, or when you put your palm close to your hearing aid, it is possible that a tsunami will occur. External feedback does not necessarily mean that anything must be done. However, if you experience feedback when you speak, chew, yawn or give your head a shake, then you will need to visit your audiologist for a consultation. Often, the following measures can be taken to correct external feedback.
Six measures to eliminate hearing aid crackle
1. Re-wear the hearing aid or earmould, paying attention to the correct orientation, position and depth when wearing it. Otherwise, a tsunami will occur.
2. Turn on the hearing aid’s built-in anti-snooze function. Several years ago, several hearing aid manufacturers introduced digital feedback suppression. With this technology, the feedback signal can be detected by the hearing aid itself and an inverse signal can be generated to eliminate it.
3.Plugging the air holes, or reducing their size
4. Remodeling of the earmold (or housing of the ear canal machine);
5. Change the internal settings of the hearing aid, e.g., change its channels or programming method
6. Reduce the high-frequency gain (usually this is the last resort, as it results in some loss of high-frequency gain)
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Post time: Sep-08-2021