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3
DATA
3-1. NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63
A7/W55
FORM NAME
QUHZ-W40VA
GHH15010
125
250
500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
BAND CENTER FREQUENCIES, Hz
63
125
250
46.4
45.3
46.4
MICROPHONE
1m
NOTCH
HEATING
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500
1000
2000
4000
40.9
35.6
33.0
25.5
UNIT
GROUND
4
SPL(dB)
43
OA
8000
21.4
43
［dB］
LINE
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