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Chapter: 2 General physics
    Section: 2.4 Acoustics
        SubSection: 2.4.3 Preferred frequencies for acoustical measurements

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2.4.3 Preferred frequencies for acoustical measurements

To facilitate comparisons of measurements and data, a preferred geometric series of acoustical test frequencies has been adopted (see ISO 266:1975). The series, shown in the table, is based on a reference frequency of 1000 Hz and extends indefinitely above and below this frequency in octave and -octave intervals. In the case of bands of sound or noise, the frequencies listed should be the geometric centre frequencies of the bands.



Preferred
frequencies/
Hz

1/1
  oct.

1/3
  oct.

Preferred
frequencies/
Hz

1/1
  oct.

1/3
  oct.

Preferred
frequencies/
Hz

1/1
  oct.

1/3
 oct.

                 

16

×

×

200

 

×

2 500

 

×

20

 

×

250

×

×

3 150

 

×

25

 

× 315

 

×

4 000

×

×

  31.5

×

×

400

 

×

5 000

 

×

40

 

×

500

×

×

6 300

 

×

50

 

×

630

 

×

8 000

×

×

63

×

×

800

 

×

10 000  

 

×

80

 

×

1000  

×

× 12 500  

 

×

100

 

×

1250  

 

×

16 000  

× ×

125

×

×

1600  

 

×

 

 

 

160

 

×

2 000   

×

×

 

 

 

                 



Reference

ISO 266:1975 Acoustics–Preferred frequencies for measurements.

G.R.Torr

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