1Air-guided hearing aids are all kinds of hearing aids that are currently used and transmitted through the air to transmit sound to the inner ear.
2Bone conduction hearing aid is through bone(Mastoids, teeth, hearing bones, etc.)The conduction transmits the sound to the hearing aid of the inner ear. 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.
Classified according to their technical principles
The hearing aids are classified into technical hearing aids, electrical 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,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. useK-AmpCircuit hearing aids are typicalTILLType, while the wide dynamic range compression circuit in most programmable hearing aids is more accurateLDFRtype.
Classification of hearing aids Hearing aid selection guide
Digital Hearing Aids: For patients with high hearing recovery requirements, digital hearing aids are available. The hearing aids are characterized as follows:
(1)Further increases the flexibility of compression feature control, adjusting the inflection point and compression ratio of hearing aid compression;
(2)The hearing aid gain and frequency response can be automatically processed, and the gain and compression characteristics of different frequency bands can be set according to the hearing loss characteristics of the hearing impaired.
(3)Non-linear automatic control of gain from sounds in different directions for minimum noise;
(4)Effectively increase gain through digital acoustic feedback control;
(5)Reducing the energy consumption of the battery compared to the analog hearing aid’s same processing of sound;
(6)Digital dual microphone auto-correction for intelligent control of sound gain from different directions;
(7)The low-voltage cue function of the digital hearing aid makes it easier to replace the battery, and the anti-electromagnetic interference function makes the dialing of the mobile phone clearer.
Programmable hearing aids: Programmable hearing aid is1988In the year, Bailaifu Company adjusted the parameters of hearing aids according to computer-programmable means. It has many advantages that adjustable hearing aids do not have:
(1)Multi-channel processing The digital chip divides the frequency range into multiple channels to determine its gain, compression threshold, and compression ratio, respectively, and the range of the channel can be freely split, which is especially suitable for patients with non-flat hearing loss.
(2)More fine adjustment The 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)Adjustable compression ratio Conventional compression-amplified hearing aids have established a fixed compression ratio at the factory, which does not necessarily match the specific loudness increase of each hearing impaired person. The digital chip makes the compression ratio adjustable.
(4)Multiple sets of programs These settings ensure the use in a wide range 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)Wide applicability Programmable hearing aids are broadly suited to a variety of hearing loss curve types and different properties such as flat, ramp, conductivity, sensorineural or mixed deafness.
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