- (01-28) -
4-4-6. NOISE
UNIT OF NOISE : DB (DECIBEL)
Sound pressure level with a weight corresponding to the




ACCEPTABLE NOISE LEVEL
Recommended noise levels for indoor regular noises

Applications
Noise Level
(dB)

Applications
Noise Level
(dB)
Concert Hall 21-30 
 34-47
Broadcasting
Studio 21-30 
Conference Room 42 or Less

Church 30 or Less 
Workshop 66-80

 38-47 
 47-56

Drawing Room 38-47 
 42-52

What is NC curve?

proposed and utilized for noise evaluations in the U.S.
How to interpret NC curve?




PRECAUTIONS CONCERNING
NOISE LEVELS
The noise values (dB) of the product indications are



proper products.

The measured values were determined in anechoic







 


close attention to the installation methods appropriate
to individual products.

 





 


0


0


0
- 20log (r/r
0


 
 
1
and L
2


L1/10
+ 10
L2/10

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