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Giovanni Maria Vona

I'm working on a reusable spectral analysis framework in RNBO that will eventually become the frontend of a realtime adaptive DSP processor based on psychoacoustic descriptors (roughness, spectral centroid, spread, flux, peak detection, etc.).

The idea is to compute the STFT only once and then share the spectral data among multiple analysis modules.

At the moment I'm trying to build what I call a SpectralFrame, i.e. a memory structure containing the magnitude spectrum of the current FFT frame.

My intended processing chain is approximately:

Audio input → fftstream~ → real / Imaginary coefficients → magnitude (sqrt(real² + imag²)) → SpectralFrame (Data) → feature extraction modules

 (not phase), since all the first features I plan to implement only require spectral magnitude.

The third outlet ("ramp") from fftstream~ is used as the write index.

Ultimately I'd like to build a modular spectral analysis library that can later be exported from RNBO (or even ported to Faust/C++), so I'm trying to choose the most robust architecture before implementing all the feature extraction modules.

Any advice or suggestions would be greatly appreciated.

Hi everyone,

I'm working on a reusable spectral analysis framework in RNBO that will eventually become the frontend of a realtime adaptive...

building-a-realtime-spectral-frame-in-rnbo-fftstream-gen-datapoke-best-practice

Building a realtime spectral frame in RNBO (fftstream~ + Gen Data/Poke): best practice?

toydrones

I'm trying to make a real-time phase vocoder in RNBO like the ones in 

. I'm not out of the woods yet, but I want to share what I have so far and get all the feedback I can.

The first example patch from the tutorial 

 ports with some modifications to compensate for RNBO's lack of framedelta~ and frameaccum~, pictured below:

Note that this is a crude workaround. While it can resynthesize the original signal as cleanly as the tutorial patches, it produces unexpected pitch/formant/phase artifacts when timestretched even a little bit , and these artifacts are notably stronger than those in the tutorial.  I assume they stem from my framedelta~ and frameaccum~ workarounds. I tinkered with this patch for a while to no avail and eventually decided to try the same thing without polar coordinates. 

The tutorial's cartesian PVOC example uses some pink send~ and receive~ pairs in what 

 an infinite loop outside the pfft~ setting:

Sure enough, attempting this scheme in RNBO wouldn't compile at first because of the infinite loop. It managed to compile with a feedback~ thrown in, but the resulting patch only produced harsh clipping. Delaying the feedback loop by fftsize or hopsize created the same clipping, which persisted even with the feedback multiplied by decimals in the 0.1 - 0.4 range. 

I did at least get a cartesian pvoc to cleanly resynthesize the signal, though not without the timestretching artifacts of my other attempt.

If I understand correctly, the pfft~ object delays its processing by some multiple of the fftsize so that it may read and write to a frame simultaneously, which results in its odd/lovely ability to accomodate infinite loops. RNBO, on the other hand, does not perform this automatic buffering, which may or may explain its lack of a framedelta~ and frameaccum~ objects. 

To me, this all suggests a subtlety in RNBO's fft~ handling not mentioned in 

. Could anyone help me better understand RNBO's fft~ object and how I might account for it in my phase vocoder project? Here are the patchers for reference:

Rnbo-PhaseVocoder_Project[1].maxpat

I'm trying to make a real-time phase vocoder in RNBO like the ones in The Phase Vocoder – Part I tutorial. I'm not out of the woods yet,...

rnbo-phase-vocoder-troubleshooting

RNBO Phase Vocoder Troubleshooting

thomas zalud

I’m using the RNBO Runner Panel on a Raspberry Pi (with 

) and I’m trying to figure out where the 

preset data for graph sets / graph presets

In the web UI I can create and load presets for a graph/set, and I can see OSC messages like:

So the preset system is clearly working, but I’d like to 

back up my preset list and preset data manually

 (for example before changing names or updating the system).

 or a preset folder containing the graph preset names.

Where does RNBO Runner Panel / RNBO OSCQuery store the graph preset files on Raspberry Pi?

Hi everyone,

I’m using the RNBO Runner Panel on a Raspberry Pi (with rnbo-runner-panel / rnbooscquery) and I’m trying to figure out where...

where-does-rnbo-runner-panel-store-graphset-preset-files-on-raspberry-pi

Where does RNBO Runner Panel store graph/set preset files on Raspberry Pi?

Julien Bayle

 project working, following the repository instructions here:

https://github.com/Cycling74/rnbo.example.daisy?tab=readme-ov-file

git clone https://github.com/Cycling74/rnbo.example.daisy.git
cd rnbo.example.daisy
git submodule update --init --recursive

cd 3rdparty/libDaisy
make

make clean
make
dfu-util -a 0 -s 0x08000000:leave -D build/RNBO.bin

So far, everything appears to complete correctly. The project builds, the binary is flashed, and there are no obvious errors in the process.

We have carefully followed the steps, including the export settings, but still get nothing.

Are there specific things we should check next?

We read about a json file while using oopsy... that would link parameter with gpio.

But we didn't have any success with oopsy.

But would it be this same json file in our process outside of oopsy ?

Some users/students here are running away using Plug Data as it can compile to Daisy.

Hi,

I’m trying to get the rnbo.example.daisy project working, following the repository instructions...

RNBO Forum