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Chinese National Standard Category: Physics and Mechanics |
English Title: | Acoustics-Reference zero for the calibration of audiometric equipment-Part 4:Reference levels for narrow-band masking noise |
Chinese Title: | 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 |
Standard No.: | GB/T 4854.4-1999 |
Category No.: | A42 |
Issued by: | State Quality and Technology Supervision Bureau |
Issued on: | 1999-03-08 |
Implemented on: | 1999-9-1 |
Status: | valid |
Superseded by: | |
Superseded on: | |
Abolished on: | |
Superseding: | |
Word Count: | 3500 words |
Similar Standards: | GB/T 25898-2010 GB/T 11670-1989 QJ A 1293-1998 GB/T 30544.12-2023 GB/T 42106-2022 GA/T 1727-2020 GB/T 30113.1-2013 GB/T 17754-2012 GB/T 22458-2008 GB/T 18022-2000 GB/T 4854.7-1999 GB/T 4854.4-1999 GB/T 17696-1999 GB/T 4854.1-1999 GB/T 17754-1999 QJ 1293A-1998 GB/T 3947-1996 JB/T 7705-1995 GB/T 3223-1994 GB/T 13823.7-1994 |
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