2x FFT overlap in RNBO

Blair's icon

Hey, as the title says, I want to create a 2x overlap in RNBO, and apply some forms of spectral processing between the fft and ifft. But I can't figure out how to get it to sound clean. There is always just unwanted sounds coming out from the windowing I guess.

I have tried the @window hann attribute but didnt have much success.

Blair's icon

bumping thiss :))

TobyAM's icon

Here's what I'm doing, works cleanly for size 2048 4x overlap:

The recent update claims "fft~/ifft~: defaults to rectangular inlets" but that doesn't seem to be the case in my patch yet, and seems to be using hamming still as stated in the helpfile.

EDIT: I'm no longer confident in my example, I'm getting noise when the material has frequencies near the bottom bin, I probably should try a custom window...

EDIT: @window hann fixed it

Blair's icon

yeah i can get a 4x but just not a 2x overlap fft

TobyAM's icon

Check out "crossdog" in the FFT Examples under Help menu for a custom window:

Blair's icon

I already tried to remake it in RNBO but I couldn't get it working even after removing the unneccesary things and ensuring there were no errors when compiling. i emailed support and they said they are making better fft documentation so hopefully they'll explain in there :))

UnUnUnium's icon

Does anyone have an example of using a 4x overlap in RNBO?

I am trying to implement as indicated above, but it sounds very different (gritty, amplitude modulated) than the pfft~ version.

I am using @window hann.

Borja Caro's icon

bumping this, im trying to do a x4 overlap of a 4096 FFT