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OC277-18
8. NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
PCH24GK
Hi
Lo
NOTCH
48
42
SPL(db)
LINE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
PCH30GK
PCH36GK
PCH42GK
Hi
Lo
NOTCH
51
45
SPL(db)
LINE
3.3ft
3.3ft
unit
about 4.62ft
MICROPHONE
ceiling
Ambient temperature 80˚F
Test conditions are based on JIS Z8731
OC277--1.qxp 01.12.14 13:02 Page 18