
249Noise
1009080706050403020100
0
10
20
0
10
0
10
0
20
60
0
40
0
40
20
40
20
403020100–10
Temperature (°C)
Temperature (°F)(a)
Atmospheric attenuation, dB/1000 ft
dB/1000 mdB/1000 m
355/710 Hz, fourth octave band, GMF 500 Hz
710/1400 Hz, fifth octave band, GMF 1000 Hz
1400/2800 Hz, sixth octave band, GMF 2000 Hz
Relative
humidity, %
10
20
30
50
70
90
0
20
60
80
100
40
Temperature (°C)
Temperature (°F)(b)
Atmospheric attenuation, dB/1000 ft
dB/1000 m
1009080706050403020100
0
10
20
30
403020100–10
2800/5600 Hz
seventh octave band
GMF 4000 Hz
Relative
humidity, (%)
10
20
30
50
70
90
FIGURE 11.12
Atmospheric attenuation (a) 500, 1000, and 2000 Hz, (b) 4000 Hz. (From Beranek, L.L., Noise and Vibr