The center frequencies for octaves and thirds are the nominal center frequencies (rounded values).
The center frequencies of the other resolutions (1/6 .. 1/24 octave) are the bands to base 10 (frequencies 1 Hz, 10 Hz, 100 Hz, ... are contained exact) see IEC 1260, DIN EN 61260.
Up to 20 frequency bands are calculated with the following midband frequencies:
|
63 kHz |
63 Hz |
|
31,5 kHz |
31,5 Hz |
|
16 kHz |
16 Hz |
|
8 kHz |
8 Hz |
|
4 kHz |
4 Hz |
|
2 kHz |
2 Hz |
|
1 kHz |
1 Hz |
|
500 Hz |
0,5 Hz |
|
250 Hz |
0,25 Hz |
|
125 Hz |
0,125 Hz |
Up to 61 frequency bands are calculated with the following midband frequencies:
|
100 kHz |
10 kHz |
1000 Hz |
100 Hz |
10 Hz |
1 Hz |
0,1 Hz |
|
80 kHz |
8 kHz |
800 Hz |
80 Hz |
8 Hz |
0,8 Hz |
|
|
63 kHz |
6,3 kHz |
630 Hz |
63 Hz |
6,3 Hz |
0,63 Hz |
|
|
50 kHz |
5 kHz |
500 Hz |
50 Hz |
5 Hz |
0,5 Hz |
|
|
40 kHz |
4 kHz |
400 Hz |
40 Hz |
4 Hz |
0,4 Hz |
|
|
31,5 kHz |
3,15 kHz |
315 Hz |
31,5 Hz |
3,15 Hz |
0,315 Hz |
|
|
25 kHz |
2,5 kHz |
250 Hz |
25 Hz |
2,5 Hz |
0,25 Hz |
|
|
16 kHz |
1,6 kHz |
160 Hz |
16 Hz |
1,6 Hz |
0,16 Hz |
|
|
12,5 kHz |
1,25 kHz |
125 Hz |
12,5 Hz |
1,25 Hz |
0,125 Hz |
|
Up to 121 frequency bands are calculated with the following midband frequencies:
Midband frequency ( i ) = 1000 * 10(( 40 - i ) / 20 )
Up to 241 frequency bands are calculated with the following midband frequencies:
Midband frequency ( i ) = 1000 * 10(( 80 - i ) / 40 )
Up to 481frequency bands are calculated with the following midband frequencies:
Midband frequency ( i ) = 1000 * 10(( 160 - i ) / 80 )