What are the advantages and disadvantages of behind-the-ear hearing AIDS?

1. The behind-the-ear hearing aid has no wires, is small in size, is easy to hide in the hair, and has certain aesthetics.

2. Because there is no friction with clothes, the noise is reduced. 3. The enhancement of low-frequency reflection of human trunk is obviously weakened, so the hearing aid with the same technical parameters as the box is better.

Two: Compared with in-ear machines and ear canal machines.

1. The behind-the-ear hearing aid is bulky and suitable for all types of hearing loss.

2. Because of the large size of the behind-the-ear hearing aid, designers can easily install some complex circuit chips to improve performance and enhance functions, such as installing an induction coil in the behind-the-ear hearing aid, which can make deaf children make phone calls or receive clear sound induction in a special audio-visual classroom; Directional microphones and the like can be installed.

3. The battery and knob are large and easy to operate.

4. Easy maintenance, good durability and easy adjustment.

5. Children's ear canal is in the growing period, so it is not suitable to use in-ear hearing AIDS. Only by changing the ear mold can the behind-the-ear machine be used more conveniently.

6. No customization is needed, and mass production can be carried out, which is beneficial to reducing the cost.

Fourthly, the disadvantages of behind-the-ear hearing AIDS.

1. The microphone hole of the behind-the-ear hearing aid is located above the auricle. Sweat on the back of the hearing aid can easily penetrate into this hole and other parts of the hearing aid, leading to hearing aid failure.

2. The behind-the-ear hearing aid is located behind the ear, and the switch and volume control are inconvenient to adjust.

This kind of hearing aid is still too big and conspicuous for people who require high appearance.

4. Compared with the box-type hearing aid, the distance between microphones is closer, and it is easy to cause the microphone sound to overflow and re-enter the microphone when it is improperly installed or the gain is large, and it will cause acoustic feedback howling after the second amplification, so a larger behind-the-ear hearing aid must be customized.

5. It is easy to produce ear blocking effect. Ear blocking effect refers to that after the entrance of concha cavity or external auditory canal is blocked by ear mold, patients feel that their voice sounds like echo or dull and unnatural. Ear blocking effect is mainly limited to low frequency sound below 2KHZ. The mechanism is that when the patient speaks, because the sound cannot leak out, the wall of the external auditory canal vibrates, and the generated sound waves are introduced into the ear again, which leads to the enhancement of the low-frequency sound pressure of the external ear. Ear blocking effect is often one of the main reasons why people with low-frequency hearing are unwilling to listen to hearing AIDS. The traditional solution is to enlarge the vent hole of the ear mold or use the open ear mold, but it is easy to cause acoustic feedback and change the frequency response range of the hearing aid.