China 'GB/T 4854.4-1999
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 4854.4-1999
Acoustics--Reference zero for the calibration of audiometric equipment--Part 4:Reference levels for narrow-band masking noise 声学 校准测听设备的基准零级 第4部分:窄带掩蔽噪声的基准级
Issued Date:1999-03-08
Implemented Date:1999-09-01
Issued by:
The Standardization Administration of the People's Republic of China
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