Does anyone has source code or formular of Flat Top Window. I found this function in HP 35670A Dynamic Signal Analyser . I tried to find the definition of this function on DSP book that I have but can not found it . The reason I want to use this function because it give very stable power spectrum amplitude . Sorry I know that it is not realate to 8051stuff but I don't know where else to get the information about it ..

Regards
Kris