Hearing aidIt is a very important aid for people with hearing impairment. There are many brands of hearing aids on the market today, and there are many different types of people. Many people are aware of the hearing aids staying in the name. Listening to hearing aids today is to bring you a deeper understanding of hearing aids, I hope our introduction is useful to everyone.
First, according to the way of hearing aid conduction, hearing aids can be divided into air conduction hearing aids, bone conduction hearing aids and tactile hearing aids.
1 and air-guided hearing aids are all kinds of hearing aids that are currently used and transmitted to the inner ear through air.
2The bone conduction hearing aid is a hearing aid that transmits sound to the inner ear through the conduction of bone (mammary, teeth, bone, etc.). Bone conduction hearing aids are mainly used for severe conductive hearing impairment, as well as inflamed external auditory canal, active period of suppurative otitis media, closed ears of both ears, and deafness who cannot use air conduction hearing aids. Such hearing aids can be used in glasses, hairpins or implants to allow the receiver to be in close contact with the mastoid or ossicular. In general, bone conduction hearing aids are not widely used.
3Tactile hearing aids, also known as vibrating hearing aids, are similar to box-type hearing aids. It replaces the earphone with a vibrator, and when used, the vibrator is worn on the wrist like a watch, and the sound is perceived by the perception of the vibration change by the touch. Such hearing aids are used for particularly severe deafness. Since the vibrator requires a strong power amplification, and the effect of the tactile sensing language signal is not good, it is generally not promoted.
Secondly, the hearing aids are classified into technical hearing aids, electrical hearing aids, electronic hearing aids, semiconductor hearing aids, integrated circuits and programmable hearing aids. If the hearing aids are classified by the degree of digital electronic technology, the hearing aids before the integrated circuit hearing aids use analog electronic components. Starting from the programmable hearing aids, the digital electronic chip enters the hearing aid and controls the operation of other analog components. Digital-to-analog hybrid circuit.
After measuring the static frequency response of the hearing aid with various devices, people pay more attention to its dynamic characteristics, because the sound that people touch every day is the signal whose intensity and frequency are dynamically changing, according to its dynamic frequency response characteristics. Hearing aids can be divided into two categories:
1, FFR (fixed frequency response) hearing aids. Most of the hearing aids on the market today are such hearing aids, and the frequency response characteristics are determined at the time of shipment from the factory. The tone knob on the hearing aid can only change its frequency response characteristics to some extent. After setting the type parameters of the hearing aid, the frequency response of the hearing aid is fixed regardless of the environment in which the user is placed.
2, LDFR (level dependent frequency response) hearing aids. Hearing aids with K-Amp circuits are typical of the TILL type, while wide dynamic range compression circuits in most programmable hearing aids are of the LDFR type in a more accurate sense.
Digital hearing aids:For patients with higher hearing recovery requirements, digital hearing aids are available. The hearing aids are characterized as follows:
1 further increases the flexibility of compression feature control and adjusts the inflection point and compression ratio of hearing aid compression;
2 can automatically process the hearing aid gain and frequency response, and can set the gain and compression characteristics of different frequency bands according to the hearing loss characteristics of the hearing impaired.
3 can nonlinearly control the gain of sounds from different directions to achieve minimum noise;
4, through digital acoustic feedback control, can effectively increase the gain;
5, the same processing of sound as analog hearing aids, reduces the energy consumption of the battery;
6, digital dual microphone automatic correction function for intelligent control of sound gain from different directions;
The low voltage prompt function of 7 and digital hearing aid makes it easier to replace the battery, and the anti-electromagnetic interference function makes the calling mobile phone clearer.
Programmable hearing aids:The programmable hearing aid is the 1988 company’s computer-programmable means for hearing aid parameter adjustment in XNUMX. It has many advantages that the adjustable hearing aid does not have:
1, multi-channel processing digital chip can divide the frequency range into multiple channels to determine its gain, compression threshold and compression ratio, and the range of the channel can be freely split, which is especially suitable for patients with non-flat hearing loss.
2, a finer adjustment digital chip can control up to a dozen hearing aid parameters. A programmable hearing aid can be adapted to hearing impaired people of different levels and different types of hearing curves.
3, a compression ratio adjustable conventional compression-amplified hearing aid, has been fixed at the factory to determine a fixed compression ratio, which does not necessarily match the specific loudness growth of each hearing impaired. The digital chip makes the compression ratio adjustable.
Selection of 4, multiple sets of programs These settings ensure the use in a variety of acoustic parameters. When hearing aid users are in a quiet office and noisy market, with a few specific programs and a switch that can be switched at any time, you can freely choose the best listening experience.
5, a wide range of applicable programmable hearing aids, is suitable for a wide variety of hearing loss curve types and different properties such as flat, ramp, conductivity, sensorineural or mixed deafness.
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