Therefore, scientists call these three representative frequencies, 500 Hz, 1000 Hz and 2000 Hz, as language frequencies. The calculation of hearing is to divide the decibels obtained from these three audio tests by 3, and the average value is the hearing level of human ears.
Extended data:
People with normal hearing will not find it difficult to listen to speeches in their daily life and work. If they can hear the conversation at a distance of 6 meters, their listening level will be within 10 decibel. According to the decibels of hearing loss and the degree of deafness detected by audiometer, it can be divided into four grades.
The average hearing loss is 26-40. It is not difficult to listen to ordinary sounds, but it is difficult to listen to the scene where there are many people in a meeting, and even smaller sounds are not easy to hear. Babies with this degree of hearing loss will affect language to varying degrees.
The average hearing loss is 465,438+0-55, so it is difficult to distinguish sound with ordinary volume. It will lead to language retardation and affect the language learning of infants.
The average hearing loss is 56-70, and speaking loudly is difficult to distinguish and understand. When it happens in infancy, it can lead to obvious language delay and abnormal pronunciation.
References:
Listening Test _ Baidu Encyclopedia