Based on the noise survey in China ,the formula (H=H+N-HN/120 ) of ISO/DIS 1999.2 (' Acoustics - Determination of Occupational noise exposure and estimation of noise induced hearing impairment ' , 1985) was ap...Based on the noise survey in China ,the formula (H=H+N-HN/120 ) of ISO/DIS 1999.2 (' Acoustics - Determination of Occupational noise exposure and estimation of noise induced hearing impairment ' , 1985) was applied to the calculation of the hearing threshold level associated with age and noise (HTLAN) of the noise - impaired people . According to the Gausscian distribution , when the noise - exposure level LEX8h was 85 ,90 ,95, 100 dB and the hearing threshold frequency is from 0.5k to 6kHz , the HTLAN of noise - exposed people withdifferent duration of exposure and its relation values to the hearing threshold frequency associated with age (HTLA) were obtained . The ISO /DIS 1999.2 has been proved to be applicable in China .展开更多
文摘Based on the noise survey in China ,the formula (H=H+N-HN/120 ) of ISO/DIS 1999.2 (' Acoustics - Determination of Occupational noise exposure and estimation of noise induced hearing impairment ' , 1985) was applied to the calculation of the hearing threshold level associated with age and noise (HTLAN) of the noise - impaired people . According to the Gausscian distribution , when the noise - exposure level LEX8h was 85 ,90 ,95, 100 dB and the hearing threshold frequency is from 0.5k to 6kHz , the HTLAN of noise - exposed people withdifferent duration of exposure and its relation values to the hearing threshold frequency associated with age (HTLA) were obtained . The ISO /DIS 1999.2 has been proved to be applicable in China .
