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The audible frequency range can be separated into unequal segments called octaves. An octave higher is a doubling of the octave band frequency. Octave bands can be separated into three ranges - referred to as one-third-octave bands. Octave Bands- listen to sound! - touch and click frequencies below!
Octave Bands
Lower Band Limit
(Hz)Center Frequency
(Hz)Upper Band Limit
(Hz)
11 16 22
22 31.5 44
44 63 88
88 125 177
177 250 355
355 500 710
710 1000 1420
1420 2000 2840
2840 4000 5680
5680 8000 11360
11360 16000 22720 The "one-third-octaves" have been standardized for scientific instruments commonly used for tasks like to determine NC-criterion and similar. Third Octave Bands1/3 Octave Bands
Lower Band Limit
(Hz)Center Frequency
(Hz)Upper Band Limit
(Hz)
11.2 12.5 14.1
14.1 16 17.8
17.8 20 22.4
22.4 25 28.2
28.2 31.5 35.5
35.5 40 44.7
44.7 50 56.2
56.2 63 70.8
70.8 80 89.1
89.1 100 112
112 125 141
141 160 178
178 200 224
224 250 282
282 315 355
355 400 447
447 500 562
562 630 708
708 800 891
891 1000 1122
1122 1250 1413
1413 1600 1778
1778 2000 2239
2239 2500 2818
2818 3150 3548
3548 4000 4467
4467 5000 5623
5623 6300 7079
7079 8000 8913
8913 10000 11220
11220 12500 14130
14130 16000 17780
17780 20000 22390 Wavelengthλ = c / f (2) where λ = wavelength (m) f = frequency (s-1, Hz)
Sound velocity depends on the density of the air and the air temperature. Typical value for speed of sound is 343 m/s for temperature 20oC.
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发表于 2018-9-10 23:43:25