How much do you know about the types of hearing AIDS?

Abstract: There are many kinds of hearing AIDS, each of which has its own suitable crowd. According to the different output conduction modes, there are bone conduction hearing AIDS and air conduction hearing AIDS. Due to the limited users and effects, bone conduction hearing AIDS are rare. At present, hearing AIDS commonly used by people are traditional air conduction hearing AIDS, which are divided into box type, behind the ears type and customized type. Let's learn about the types of hearing AIDS. What are the classifications of hearing AIDS?

Hearing AIDS are divided into bone conduction hearing AIDS and air conduction hearing AIDS. Bone conduction hearing AIDS include hair band heel implant and glasses; At present, the most widely used hearing AIDS are air conduction type, such as analog signal box, behind-the-ear digital signal (common and open), customized type (concha cavity, in-ear type, ear canal type) and so on.

First, classify them according to their appearance.

1, hearing aid box

Also known as the body-wearing type, it appeared earlier, with a larger volume and a shape like a miniature radio. It is worn in front of you, and there is a wire to send the sound output signal to the earphone. Ordinary transistor elements are mostly used, so the price is low. It is large in size, convenient for making hearing AIDS with high power output, wide spectrum range and multifunctional adjustment, and suitable for people with poor finger movement. The thermal noise of the components of this hearing aid is high, which makes the background noise of the hearing aid high. Because the box hearing aid often rubs against clothes, the rubbing sound often becomes interference noise.

2. Glasses and hearing AIDS

It is only a transitional product in the development process from body-worn hearing aid to ear-level hearing aid. Microphone and receiver can transmit signals at different temples, some at the same temple. At present, this kind of hearing aid is rare.

3, behind the ear hearing AIDS

It is the most widely used hearing aid at present. It is slim in appearance and hangs behind the ear by a hard plastic ear hook bent into a semicircle. The shell can be covered by the color of skin or hair. The amplified sound is transmitted into the sound hole of the ear mold through the plastic pipe and the ear hook, and the output power varies from large to medium. Most patients with different degrees of hearing loss can use behind-the-ear hearing AIDS. There are also various sound processing circuits in high-end behind-the-ear hearing AIDS, such as automatic gain control.

4. In-ear hearing AIDS

In-ear hearing AIDS should be divided into concha cavity hearing AIDS and ear canal hearing AIDS. The nail cavity type can be divided into full nail cavity type and half nail cavity type. Ear canal hearing aid has also developed a complete ear canal hearing aid (CIC). In-ear hearing AIDS are more exquisite in appearance and are specially customized according to the shape of everyone's concha cavity or ear canal. When in use, it is placed directly in the concha cavity or ear canal without any wires or hoses, which is very hidden. However, the output power of in-ear hearing AIDS is not very high, and it is only suitable for patients with mild, moderate and moderate deafness.

5. Bone conduction hearing aid

Patients with congenital hypoplasia of external ear (such as atresia of external auditory canal and ear malformation) and some patients who are not suitable for wearing air-conduction hearing AIDS due to diseases of external ear and middle ear (such as suppurative otitis media) may consider matching bone-conduction hearing AIDS.

Second, according to their technical principles.

1, FFR hearing aid

At present, most hearing AIDS on the market are of this kind, and their frequency response characteristics are determined when the products leave the factory. The tone knob of hearing aid can only change the frequency response characteristics to a certain extent. After selecting the parameters of the hearing aid, the frequency response of the hearing aid is fixed no matter what acoustic environment the patient is in.

2, LDFR hearing AIDS

Hearing AIDS with K-Amp circuits are typical TILL types, while the wide dynamic range compression circuits in most programmable hearing AIDS are more accurate LDFR.

Third, according to the functional scope.

1, fixed wired collective hearing aid

This kind of collective hearing aid is actually similar to the phonetic classroom system used in oral English teaching. There is a host computer on the teacher's desk, and each student's desk is equipped with an extension. Both the main computer and the extension computer are equipped with microphones and special earphones, and the main computer cannot be connected with auxiliary teaching facilities such as tape recorders. There are lines between the host and the extension, and between the extension and the voice of the extension, which can realize free dialogue. With advanced collective hearing AIDS, teachers can also adjust the volume and tone of each earphone according to the specific hearing loss of each hearing-impaired person, regardless of the distance of the classroom or the student equipment in the front row and back row, they can hear clear and moderate sound. This provides favorable conditions for oral teaching and strengthening the language ability of deaf children. The disadvantage is that this kind of hearing aid is only used in the classroom. For each individual user, the frequency response of headphones is not necessarily the same as his own personal hearing aid.

2. FM hearing AIDS

The sound source is received by one or more FM hearing AIDS through a FM signal generator (similar to a wireless microphone). Hearing AIDS worn by deaf people can be connected with "demodulation" elements to receive demodulated sound signals, and can also be used as general hearing AIDS, and their parameters are the same as those of ordinary hearing AIDS. This kind of hearing aid is easy to use, not limited by deaf people's activities, and can receive sounds within a radius of 100 meters, which is very suitable for outdoor teaching of deaf children. One-to-one FM hearing AIDS are more suitable for deaf children who have been trained in hearing and speech and studied with normal hearing children at school. Because the teacher pinned the microphone to his collar, he could hear the teacher clearly no matter where the deaf sat. Many families place FM signal generators near TV speakers so that deaf people can clearly hear TV sounds in the distance.

3. Closed circuit electromagnetic induction collective hearing aid system

This hearing aid system consists of amplification and frequency modulation components, coils and personal hearing AIDS pre-arranged in classrooms, homes and other indoor places. The sound transmission, amplification and frequency modulation components can transmit the sound of a tape recorder, a radio, a TV set or a teacher to the range surrounded by the coil in the form of electromagnetic waves. Deaf people can make full use of the T (telecoil) file of the button assistor to enter the room where the coil is laid in advance, and receive clear sound through the principle of electromagnetic induction, regardless of the distance and the number of people. The specific application effect is directly related to whether the coil setting is reasonable and the sensitivity of the T-class pickup coil.