Acoustics; Threshold of hearing by air conduction as a function of age and sex for otologically normal persons

This standard specifies the relationship between the air conduction hearing threshold of normal otologists and their age and gender, and is used for corrections in the evaluation of hearing loss in hearing tests, labor protection and other research work. GB/T 7582-1987 Acoustics Relationship between the air conduction hearing threshold of normal otologists and their age and gender GB/T7582-1987 Standard download decompression password: www.bzxz.net
This standard specifies the relationship between the air conduction hearing threshold of normal otologists and their age and gender, and is used for corrections in the evaluation of hearing loss in hearing tests, labor protection and other research work.

1 Introduction
National Standard of the People's Republic of China
Relationship between air conduction hearing and age and sex for otologically normal persons
UDC 534.75:612
GB 75B2-87
1.1 This standard specifies the relationship between air conduction hearing loss and age and sex for otologically normal persons, and is used for evaluation of hearing loss in hearing test, labor protection and other research work. 1.2 This standard adopts the international standard ISO7029-1984 "Acoustics-Relationship between air conduction hearing and age and sex for otologically normal persons".
2 Scope of Application
2.1 For age groups of normal otological subjects with an audiometric frequency range of 125 to 8000 Hz and an age range of 18 to 70 years, this standard specifies: a. the expected value of the median hearing loss relative to the 18-year-old age group; b. the expected statistical distribution above and below the median. 2.2 The data in this standard are applicable to descriptive statistics of hearing levels for people of different ages. For example, this standard can be used as a baseline for comparison when estimating the amount of hearing loss caused by a particular cause, such as noise, in a population. In addition, this standard can also be used to compare an individual's hearing with the normal distribution of hearing levels for the same age group. However, in such audiological diagnosis, it is not possible to accurately distinguish which changes in hearing levels are due to age and which are due to other factors, such as noise. 3.3 Terminology
3.1 Otologist (normal ear function) A healthy person who has no ear disease symptoms, no blockage in the ear canal, and no history of adverse noise exposure. 3.2 Hearing level
A person's hearing level refers to the minimum sound pressure level that can correctly cause hearing in more than half of the repeated tests with a specified sound signal under specified conditions.
3.3 Hearing level
The pure tone sound pressure level produced by a specified type of earphone in a specified way of use in a specified acoustic coupling cavity or artificial ear at a specified frequency minus the corresponding standard equivalent hearing sound pressure level. Note: The values ​​of the standard equivalent hearing sound pressure levels of different types of H machines are listed in GB4854-84 "Standard Zero Level for Calibration of Pure Tone Audiometers". $,4 Hearing level
A person's hearing level refers to the hearing level expressed in hearing level measured at a specified frequency using a specified type of earphone and a specified method. 4 Notes
4.1 Median
Approved by the National Bureau of Standards on March 27, 1987
Implementation on November 1, 1987
GB 7582-87
The median deviation of the hearing threshold level of normal otologists aged Y years is given by the following equation: Hmd,y=α (Y- 18)3+ Hmd-la
Wherein, Hmd,Y
-the value of the hearing threshold level of a certain age Y years old, dB,
-age, years (a),
-coefficient, dB/a2,
the median value of the hearing threshold level of normal otologists of the same gender and age of 18 years old, dB. Standard: For practical purposes, Hmd,1 can be regarded as equal to the hearing threshold level of young people in GB4854-1. The median value specified in this standard is not the mode value used in GB 4854-B4. The values ​​of the α coefficient for men and women are listed in Table 1. The valid age range in formula (1) is from 18 to 70 years old. Table 1 Coefficient values ​​used to calculate the median deviation of the hearing level for normal otological people of a certain age
α, dB /a?
Duration, Hz
4.2 Statistical distribution
As the standard month, the statistical distribution of the hearing level of normal otological people of a certain age is approximately two normal distributions (Gaussian distribution).
The normal distribution above the median value, Hmd, has a large dispersion characterized by the parameter u. The normal distribution below the value has a small dispersion characterized by the parameter 3,. The decibel values ​​of the parameters su and s, are obtained from the following equations: Su = bu +0.445 Hmd,
51 = b +0.356 Hmd, y
where: su-
standard deviation of normal distribution above median Hmd, dBf standard deviation of normal distribution below median Hmd, dB. See Table 2 for the values ​​of bu and b. Www.bzxZ.net
GB7582—87
Table 2 Parameters used to calculate the standard deviation of the upper and lower parts of the statistical distribution of hearing levels centered on the median for a normal otological population of a certain age. and still, the value frequency, 112
To calculate su, first refer to Table 2 for the corresponding frequency and gender, and obtain Elbu,f and then use equation (2) to determine u. Similarly, 61 is obtained from Table 2, and then equation (3) is used to determine 514.2.2 To determine the hearing level expected to exceed a certain fraction Q of the normal otological population of a certain age, it can be carried out as described in 4.2.2.1 and .2.2.2.
Note: In Appendix B 1 gives the choice of parameters. For the hearing threshold level of a certain Q score of the population when 0.05Q≤0.5, the following equation is used to calculate: 4.2.2.15
Iq,v - Hmd, +ksu
Where; k is a coefficient, which is a function of Q specified in 4.2.2.3. 4.2.2.2 For the hearing threshold level of a certain Q score of the population when 0.5<.Q<.0.95, the following equation is used to calculate: o,y =Hmd,y-hs,
武中—
coefficient, is the function specified in 4.2.2.3. :4)
4.2.2.8 The coefficient values ​​for the fraction Q from 0.05 to 0.95 (5% to 95%) with an interval of 0.01 equivalent to the stationary distribution (Gaussian distribution) are given in Table 3.
Coefficient value
GB 7582—87
Continued Table 3
To: For 0
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