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 is any integer, 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 frequency limit for each band is fL = fm / 2 ^1/6
The upper frequency limit for each band is fU = fm * 2 ^1/6
It can be found using this method.

fm=1000 fL ＝ 890.9 、 fU = 1122.46

Please refer to "Technical Report: What is a Sound Level Meter?".
Technical Report: What is a Sound Level Meter?