spectral transformations and rec array

[Zucchi]

Hi,

I would like to know how would you proceed to record and playback an array of values ? The goal is to do some spectral transforms on audio flow with FFT.

I tried to record the output of [FFT forward] into a stereo [Audio Sampler Recorder] (one chan for real part and other one for imaginary) but it's not really efficient and I'm limited to the usine bloc size for the window size of my FFT. I'm also not sure about how the conversion works between real values and dB inside the recorder.

Z.

[SylvainT]

Hello,

The FFT forward output is an array, so impossible to record with a sampler, and for sure you'll be limited to the usine bloc size for the window size of your FFT.
It will be difficult to record FFT, so many bins to rec, you'll need huge arrays.
Why dont you use a sampler recorder before the FFT manipulation.

Sylvain

[x.iso]

yeah, it would make sense to record sample instead, FFT is designed for real-time processing after all. and Usine is not really designed to do 'offline' processing, as there's no audio export as well.

[Zucchi]

Hi,
I wanted to record the different bins for a spectral freeze effect. I wanted to do some translations and rec a small window to read in random orders added with a small amount of noise on each real bin. That's why I wanted to use some arrays for the maths.

[SylvainT]

Make polyphonic subpatch with arrays to save your differents states and then recall them.
Be carefull with FFT manipulations, it could be very expensive in CPU consumption. You'll had to trigg your calculations with the bins size.

[x.iso]

Hi,
I wanted to record the different bins for a spectral freeze effect. I wanted to do some translations and rec a small window to read in random orders added with a small amount of noise on each real bin. That's why I wanted to use some arrays for the maths.

There's example patch in the library called 'Spectral Average', perhaps that's what you're looking for.

[oli_lab]

Hi !
have a look at my module "store array 512x2048" in the oli_lab pack/datalab/array
it provides what you need to store array from an FFT then to retrive stored arrays and do morphing.

see also the example included in the pack.

cheers