Spectral Smearing like Serum 2 Bode's Blur?

[Kallyn]

Hello! I am working on a plugin with some internal creative effects to affect the sound before the main processing begins. I am taking inspiration from plugins like Serum that have a lot of creative filters and phasers/flangers. I'd like to add a Blur control, similar to the one found in Serum 2's Bode effect or in Echobode by Sonic Charge. I have to guess that this Blur effect is similar but distinct from a short reverb, and likely uses allpass filters, but I'm having a lot of trouble finding a source for designing something like that. What is the most likely approach for designing a blurring filter like the ones listed?

[gambero]

Take a look at diffusion networks in reverbs, Signalsmith has a great article
https://signalsmith-audio.co.uk/writing ... #diffusion

[Kallyn]

I'll have to read through this. I was really hoping that the specific blur effect was already a known algorithm, as I don't really trust myself to create that kind of effect with such little experience, but maybe I'll be able to get something nice from this article.

Just found it a little weird that the only plugins I'd seen this smear control on were related to frequency shifters, thought maybe there was some correlation there.

[Dirtgrain]

SpecOps has a Smear parameter (not sure how well it compares to Serum's) and some other parameters that might help blur.
Bin Scrambler seems to work: https://www.andrewreeman.com/spectralsuite/

[Kallyn]

Take a look at diffusion networks in reverbs, Signalsmith has a great article
https://signalsmith-audio.co.uk/writing ... #diffusion

This is exactly what I needed! The Diffusion section really explained it well, and stacking Schroeder allpasses with randomized times did the trick. Thanks for the recommendation!

[Kallyn]

SpecOps has a Smear parameter (not sure how well it compares to Serum's) and some other parameters that might help blur.
Bin Scrambler seems to work: https://www.andrewreeman.com/spectralsuite/

I know exactly what you're talking about, but that's not quite the effect I was looking for. It was hard for me to specify a time-based smearing, like Bode, from a frequency-based smearing, like SpecOps (which Serum also has in its spectral oscillator i believe). Turns out Diffusion is what I needed.

[Touch The Universe]

Take a look at diffusion networks in reverbs, Signalsmith has a great article
https://signalsmith-audio.co.uk/writing ... #diffusion

This is exactly what I needed! The Diffusion section really explained it well, and stacking Schroeder allpasses with randomized times did the trick. Thanks for the recommendation!

How does that turn into the echobode sound? is it a filter plus a diffuser?

[gambero]

How does that turn into the echobode sound? is it a filter plus a diffuser?

The allpass filters discussed above are just for the "smearing" or "blur" effect. Main part of Echobode is a delay line with a Bode frequency shifter.

https://dsp.stackexchange.com/questions ... cy-shifter