The principle of hearing examination is open--the transmission of sound and hearing examination-3

4. Hearing test about sound
There are two ways in which the human ear picks up the sound, one is air conduction and the other is bone conduction. At the same time, the sound is composed of different sound intensities and frequencies. In order to check the hearing of the human ear, it is necessary to perform air conduction and bone conduction hearing tests according to different sound intensities and frequencies to judge the degree of hearing loss and hearing properties.

The human ear's audiogram is represented by the abscissa frequency (Hz) and the intensity of the ordinate sound (dB). It can visually understand the decibel value of the minimum sound size of different frequencies that can be heard by the human ear, and is used for hearing aid fitting and understanding. The most direct basis for hearing conditions, audiograms can help us understand the situation of hearing loss.