How Do I Compare Hearing Aids?

Deaf hearing aids are all tools, equipment, devices, and instruments that help people with hearing impairment to improve their hearing impairment and thus improve their ability to communicate with others.

Deaf hearing aid

Deaf hearing aid

There are four main types of deaf hearing aids worn by individuals:

1,

One,

All deaf hearing aids consist of three main components: a microphone (microphone), an amplifier, and a receiver (headphone). The microphone is an acoustic-electric transducer that converts external sound signals into electrical signals. After inputting the amplifier, the sound pressure is amplified to 10,000 to tens of thousands of times, and then the microphone outputs the amplified sound signal. Deaf hearing aids should also include battery power to power the machine. Due to different properties and different levels of hearing impairment, the device volume adjustment, tone adjustment, maximum sound output adjustment, telephone pickup and other equipment, as well as the OMT (off-microphone-phone) three-position switch are indispensable. of. The vast majority of deaf patients are sensorineural deafness, and quite a few of them have a revitalization-positive phenomenon. They have difficulty hearing in a low voice, but the louder voice is unbearable, and the dynamic range of loudness perception is significantly reduced. Because electronically, AGC or PC circuits are used to implement compression and limiting functions, so that deaf people can more satisfactorily use deaf hearing aids to overcome hearing impairments.

A qualified deaf hearing aid should consider at least the following six performance indicators:

1. Frequency range. The frequency range of low-grade deaf hearing aids is at least 300 ~ 3000Hz, the high frequency of ordinary deaf hearing aids should reach 4000Hz, and the frequency range of advanced deaf hearing aids can be between 80 ~ 8000Hz.

2. Maximum sound output or saturated sound pressure level (SSPL). It actually represents the maximum power output of deaf hearing aids. When using deaf hearing aids, the maximum sound output should be lower than the discomfort threshold of the affected ear. Especially for patients with positive resuscitation, the maximum sound output must be controlled to protect the affected ear.

3. Maximum sound gain. It mainly shows the deafness hearing aid's amplification ability. Deafness hearing aids produced in various countries have a gain of between 30 and 80dB. Generally speaking, deafness should be selected with a small gain, and deafness should be selected with a medium or large deaf hearing aid. Deaf hearing aids are provided with a volume adjustment switch for changing the sound gain within a certain range. Matching suitable deaf hearing aids can be calculated in advance according to some formulas. The simplest method is to adjust the gain compensation of three audio frequencies of 500, 1000, and 2000Hz according to the pure tone audiogram. It is better to use half or slightly more of its threshold. Get satisfactory results.

4. Frequency response and tone adjustment. In order to meet the hearing requirements of deaf people, deaf hearing aids should provide a variety of different frequency responses. Different frequencies respond to different tones. In order to make the frequency response of deaf hearing aids more compatible with the hearing loss characteristics of deaf people, a number of different tones are set on the tone adjustment knob. Generally, L represents bass, N is normal, and H is treble.

5. Signal to noise ratio (S / N). The amplified output of deaf hearing aid earphones is often the presence of both language signals and annoying noise. The larger the signal-to-noise ratio, the better the quality of language information output. The signal-to-noise ratio of high-quality deaf hearing aids can reach about 40dB, and at least 30dB should be guaranteed.

6. Harmonic distortion. In order to transmit the amplified sound signal at high altitude, the distortion of deaf hearing aids should be as small as possible. According to regulations, the distortion should be less than 10%, and less than 5% can basically maintain the fidelity of speech.

Deafness should be detected as early as possible, and the hearing loss level of children should be determined before the age of 2 years. It is best to insist on using deaf hearing aid amplification equipment before the age of half, and immediately start long-term sound stimulation, and carry out tireless hearing training and language training to promote brain hearing center The language center is fully developed. Generally speaking, after several years or even more than ten years of training, deaf children with hearing loss of 60-70dB can completely develop the ability of oral communication through the auditory pathway; while those with hearing loss of 90dB need to combine visual and tactile pathways to establish speech ability. Many of them can attend ordinary middle school and university courses, and some can obtain degrees with honors. All kinds of deaf hearing aids or auditory language training devices are used promptly and properly, and can almost half or two thirds of deaf children get rid of deafness, which has become a reality in many developed countries. Most elderly people are not satisfied with the initial results of wearing deaf hearing aids. Special training and guidance are needed to achieve the purpose of hearing rehabilitation.

Deaf hearing aids are the only type in modern society that must be worn at all times in daily activities, are very precise, work in a variety of harsh weather conditions and living environments at any time, and are easily dropped when worn. Scientific and technological electronic products, for various reasons, deaf deaf hearing aids need to be well maintained to get the best results. From the results of research on custom machines in recent years, it is found that earplugs are blocked, wet, and impacted by unintentional drops are the three major causes of deaf hearing aids, especially custom machine damage.

Damage to earwax

Among them, earwax clogging is the main cause of damage to expensive receivers. Earwax in Chinese is usually dry. Normally, most of the earwax will gradually fall out of the ear canal due to vibration during normal speech, chewing, and walking, but some will remain in the ear canal, especially when customized. After the flight, the ear canal is blocked, and the earwax cannot fall out normally. The earwax can only go into the receiver hole of the handset. The lighter makes the sound lighter, and the heavyr causes the receiver to be severely blocked and cause damage. Come unnecessary losses.

Frequent regular cleaning of the receiver hole requires the joint efforts of the dealer and the user. Do not underestimate a small piece of earwax, it may bring you huge losses and inconvenience. Follow the instructions to clean up the earwax. It takes less time but can save you a lot of maintenance costs and avoid inorganic yarns.

Hazards of water vapor

One of the biggest enemies of deaf hearing aids is water vapor. It is generally known that water vapor will enter the deaf hearing aid from the gap of the battery compartment door and various adjustment buttons and accumulate, which will affect the internal circuit of the deaf hearing aid, cause the volume of water in the cavity of the customized cabinet to be stored, and corrode the movement and internal wiring. Therefore, in normal use, in addition to taking care not to let the surrounding water vapor into deaf hearing aids, such as adjusting the deaf hearing aid with wet hands or rain.

The damage caused by water vapor entering the receiver cavity from the receiver hole of the customized machine is not well known. In southern China, the period of high temperature is very long throughout the year. Daily homework, generally after showering, a small amount of water will inevitably splash into the ear canal. A little water in the ear canal of a normal person will evaporate quickly, but if the deaf person has water in the ear canal and wears a custom machine without drying it, it will completely block the water in the small ear between the custom machine and the eardrum. In the channel space, the water becomes water vapor after being heated, enters the deep cavity of the receiver, and then gradually cools and accumulates into liquid water. It constantly soaks the extremely small parts in the receiver, damaging the receiver, causing an abnormal sound when it is light. Make the receiver completely reimbursed.

It is very important to pay attention to keeping the ear canal dry. When deaf hearing aids are not in use, put them in a desiccant to dry the water vapor from the machine. This will bring a very long life to your deaf hearing aids.

3. Impact damage

Deaf hearing aids are very afraid of falling like quartz watches, because the components in deaf hearing aids are connected by very small wires, and they are easily broken after being impacted, especially due to the structure of the receiver, the internal sounding vibration reeds and The thimble is very easy to shift and deform after impact, causing distortion or silence (see the detailed introduction article of the receiver structure).

In the production process of the receiver, if the receiver falls from a high place before packaging, the only way to dispose of it is to discard the receiver.

After the receiver is installed in the deaf hearing aid casing, although the degree of impact resistance has been improved, it still needs to be attached great importance to prevent falling impact. Due to the small size of the custom machine, it is relatively easy to slip out of the hand when put on or taken off, so you must pay attention to this point.

Deaf hearing aid

When deaf hearing aids are not in use, turn the switch off and open the battery door to extend battery life. If a deaf hearing aid isn't turned off, it can make a "squeak" howling, which can draw the attention of children or pets, causing unnecessary damage.

Therefore, keep deaf hearing aids out of the reach of children or pets. If the deaf hearing aid is not used for a long time, please put it in a special pocket and store it in a cool, dry place

Cleaning and maintenance

Develop a habit of cleaning deaf hearing aids every day. Use a brush provided by the company to brush away ear wax or other small particles that accumulate around the ear canal mouth of the deaf hearing aid, the volume adjustment knob and the battery compartment, and then gently wipe the deaf hearing aid with a soft cloth. Never use solvents, cleaning solutions or oils to clean deaf hearing aids.

Deaf hearing aids are very delicate, so when cleaning and maintenance, it is best to carry out on a soft cloth or towel on the table to avoid unnecessary damage or missing parts.

Once you have adapted a deaf hearing aid, sometimes you forget that it is working, so be sure to take out the deaf hearing aid when you are swimming, bathing, or using hair spray. Of course, when doing laundry, check for deaf hearing aids in your pocket as well.

If deaf hearing aids get wet, do not use drying tools such as ovens, microwaves, or hair dryers-this can easily damage the deaf hearing aids. Instead, remove the damp battery, open the deaf hearing aid battery door, put the deaf hearing aid on a towel and store it in a safe place to achieve the purpose of driving the damp.