Hi Guys,

i try to understand the rfft/rifft, windowing and overlapping processes in pd. i learned that you have to multiply your audio befor and after the fft/ifft with a window to smooth the edges between the frames. i did a test patch that shows me the signal befor and after windowing. the curios think is, that the multiplying after the ifft doesn't recreate the input signal. i always thought it should be. i get an perfect recreation of the input signal only when i divide insteat of multiplying the signal with the window after the ifft. and when i choose different overlapping factors in the block~ object, it looks much stranger.
can anyone explain me that behavior?

best regards,

matthias

http://www.pdpatchrepo.info/hurleur/20110610_WindowTesting.pd

Mmmm