http://www.delphipraxis.net/internal...ct.php?t=11518
das dürfte helfen.
und das auch noch:
As an example, if you request a 1024 sample FFT from a 44100hz stream, the values (bins) will be:
0:
DC (you can ignore this)
1: 1 x (44100/1024) = 43hz
2: 2 x (44100/1024) = 86hz
3: 3 x (44100/1024) = 129hz
etc...