How much is the hearing aid? It depends on what you buy and the brand of hearing aid. But one thing you should remember is that it is not the most expensive, nor is it the most suitable for you. What you need is the most suitable hearing aid, not the most expensive hearing aid, so as to get your money's worth.
Now there are several major brands on the market, such as Fengli, Aosta, Siemens, Stark and so on. In contrast, Ostar's is relatively cheaper. You can check it online, and of course you can also go to the hearing aid fitting center.
The following are the advantages of binaural hearing AIDS.
1. Binaural squelch effect
When hearing AIDS are used in both ears, the mute function of binaural hearing can be used to improve the selectivity of patients' multiple signals, suppress the interference of background noise, and make the background noise difficult to mask the speech. The squelch effect can increase the signal by 12dB, and it is still acceptable.
2. Binaural fusion
Refers to the comprehensive effect of both ears on similar sound signals. If one ear hears low-frequency sounds first and the other ear hears high-frequency sounds later, then we hear two kinds of sounds, one high and the other low. If you receive high and low signals at the same time, you will hear a comprehensive sound. This is integration.
3. Binaural accumulation
Compared with mono-ear hearing, the sound intensity of binaural hearing can be significantly increased by 6~ 10dB. The binaural hearing threshold is also about 3dB higher than that of mono-ear audiometry. For children with severe or deep hearing loss, binaural selection of large gain hearing AIDS can take advantage of this suprathreshold cumulative effect to achieve an effective comfortable loudness level.
4. Binaural orientation
The human ear should determine the direction of the sound source by comparing the arrival time and loudness of the sound between the ears. Directional movements depend on the ear's ability to distinguish intensity, time, phase and frequency differences between them. One ear has no positioning function. When listening with one ear, the sound source seems to come from the side of the listening ear; The sound from the other ear feels far away, or it feels on the healthy side (actually the affected side). When brain stem or moderate brain injury occurs, the localization function will also weaken or disappear.
Step 5 Eliminate shadowing effect in the head
When the sound reaches both ears, it will be blocked by the head, making the sound intensity at both ears inconsistent. Because of the short wavelength, the high-frequency components in speech are not easy to pass through the skull, so when they reach the other ear, their intensity is attenuated more than that of the low-frequency components. Therefore, the intensity difference between the near ear and the far ear makes the signal-to-noise ratio between the two ears very different. People with normal hearing and hearing AIDS are used to pointing one ear to the side they want to hear, which is this feature.
6. The role of preventing hearing loss/degradation
Beggs and Foreman found that the critical period of binaural stimulation is 4~8 years old, and once again emphasized the importance of hearing aid selection in early stage for deaf children. Studies on adults have found that the speech discrimination rate of both ears will remain stable after using hearing AIDS for 4 to 5 years; However, if one ear is used, the speech discrimination rate of the helpless side will decrease after 4~5 years.
7. Good quality
Although the speech recognition rate of some patients who use hearing AIDS has not improved significantly, most patients feel that the sound quality has improved. For people who use hearing AIDS for the first time, it is far easier to satisfy patients by trying to choose binaural hearing AIDS than using monaural hearing AIDS. Moreover, binaural fusion of distorted signals is far more effective than monaural fusion.
8. Easy to listen to
Deaf children and adults who use hearing AIDS in both ears are more relaxed when communicating with others, and it is easier to listen to people than to use hearing AIDS.
9. Shorten the adaptation period of patients' hearing AIDS.
When using or replacing a hearing aid for the first time, the patient needs an adaptation period, because the amplified sound is different from what he heard before. This is because the existing acoustic codes in the auditory system do not match. The longer the hearing aid is not used after hearing loss, the longer the adaptation period will be. The use of binaural hearing AIDS obviously shortens this relearning process and makes it easier for patients to accept.
10. tinnitus
Most scholars believe that the best tinnitus masking device is hearing aid, especially for binaural use. If only one hearing aid is used, the tinnitus on one side may be relieved, while the tinnitus on the other side still exists.
1 1. Reduce reverberation effect.
Hearing loss This is more easily disturbed by the reverberation of surrounding noise than ordinary people. Compared with monaural hearing AIDS, binaural hearing AIDS have advantages in reducing reverberation.
12. Application of Band Separation Amplification in Binaural Matching
Experiments show that when low-frequency sound and high-frequency sound are input into two ears respectively, the consonant resolution score increases. This is because the masking effect of low frequency on high frequency is reduced. Young patients are more obvious than elderly patients.