Hearing Aid Performance And Indicators

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

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

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

③Maximum sound gain. It mainly refers to the amplification ability of hearing aids. The gains of hearing aids produced in various countries are mostly between 30 and 80 dB. Generally speaking, if the degree of deafness is mild, you should choose a small gain, and those with a severe degree should choose a hearing aid with medium or large gain. In specific use, hearing aids are equipped with volume adjustment switches that can change the sound gain within a certain range. The appropriate hearing aid can be pre-calculated according to some formulas. The easiest way is to adjust the gain compensation of the three audio frequencies of 500, 1000, and 2000 Hz according to the pure tone audiogram. Half of the threshold value or slightly more is appropriate. Satisfactory results.

④Frequency response and tone adjustment. In order to meet the hearing requirements of the deaf, hearing aids should provide a variety of different frequency responses. Different frequency responses are auditory tones. In order to make the frequency response of hearing aids more in line with the characteristics of hearing loss of the deaf, a number of different tones are set on the pitch adjustment button, usually L stands for bass, N stands for normal, and H stands for high pitch.

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

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

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