sound level meter Frequently Asked Questions

The exact center frequency fm can be calculated using the following formula.

fm ＝ G^x/3 ＊ 1000

G ＝10^3/10 ＝1.99526

x can be any integer that is positive, negative, or zero.

example

x=-10 fm = 1.99526^-10/3＊1000 = 100
x=-1 fm = 1.99526^-1/3＊1000 = 794.33
x=0 fm = 1.99526 ^0/3＊1000 = 1000
x=1 fm = 1.99526 ^1/3＊ 1000 = 1258.9
x=5 fm = 1.99526 ^5/3＊ 1000 = 3162.3
The lower limit frequency of each band is given by fL = fm /2 ^1/6
The upper limit frequency of each band is given by fU = fm *2 ^1/6
.

fm=1000 fL ＝ 890.9 、 fU = 1122.46

Please refer to the "Technical Report: What is a sound level meter".
Technical Report What is a sound level meter