4

Frequency resolution

Naming bands

Exact Center

Names of Octave

Names of Third-octave

Frequency (Hz)

Bands (Hz)

Bands (Hz)

12.589

 

12.5

15.849

16

16

19.953

 

20

25.119

 

25

31.623

31.5

31.5

39.811

 

40

50.119

 

50

63.096

63

63

79.433

 

80

100.00

 

100

125.89

125

125

158.49

 

160

199.53

 

200

251.19

250

250

316.23

 

315

398.11

 

400

501.19

500

500

630.96

 

630

794.33

 

800

1000.0

1000

1000

1258.9

 

1250

1584.9

 

1600

1995.3

2000

2000

2511.9

 

2500

3162.3

 

3150

3981.1

4000

4000

5011.9

 

5000

6309.6

 

6300

7943.3

8000

8000

10000

 

10000

12589

 

12500

15849

16000

16000

19953

 

20000

Table 1-1: Acoustical range bands

Models SE and DL

Page 17
Image 17
3M DL, SE user manual Acoustical range bands, Exact Center Names of Octave