[PD] Help with reverb design and vanilla's abstractions ([rev1~]/[rev2~]/[rev3~])
Alexandre Torres Porres
porres at gmail.com
Tue Mar 12 15:41:33 CET 2019
like this: https://valhalladsp.com/category/reverb/ ?
yeah, seems like a good discussion going on ;)
Em ter, 12 de mar de 2019 às 03:49, Matt Davey <hard.off at gmail.com>
> Look up Sean Costello’s (valhalla reverbs)postings on forums and his
> blog. He shares lots of things, but you have to dig for it all.
> On Tue, 12 Mar 2019 at 12:02, Alexandre Torres Porres <porres at gmail.com>
>> thanks everyone for all the "reverberation"
>> Em qui, 7 de fev de 2019 às 09:23, Dario Sanfilippo <
>> sanfilippo.dario at gmail.com> escreveu:
>>> as far as I understand, the idea is to have an FDN, with whatever matrix
>>> you've chosen, whose impulse response is as close as possible to white
>>> noise. The filters that you put inside the network can then be used to
>>> model different environments.
>> cool, thanks
>> There is an algorithm on the website of J. O. Smith to calculate the best
>>> approximation for a desired size while keeping the coprime relationship
>>> between the lengths:
>>> My reverb in PD is a 16th order FDN with Hadamard matrix and 1pole
>>> lowpass filters to model the absorption of high frequencies
>> yeah, I saw that on the facebook group, and also that you mentioned there
>> it was based on a model by "Rocchesso".
>>> I found these good reads:
>>> Rocchesso, D. 1997. “Maximally diffusive yet efficient feedback delay
>>> networks for artificial reverberation.” In Signal Processing Letters,
>>> IEEE 4 (9), 252255.
>>> Rocchesso, D., and J. O. Smith. 1997. “Circulant and Elliptic Feedback
>>> Delay Networks for Artificial Reverberation.” I EEE Transactions on
>>> Speech and Audio Processing 5 (1):51–63.
>> yup, that's the source then :) I was able to find them both online!
>> Now, a question. You say it uses a Hadamard matrix, but I've realized
>> it's basically the same matrix as used in [rev3~], it's only flipped
>> vertically (I hope you know what I mean) and I ask if it is the same matrix
>> or if this difference grants it to be another matrix that goes by a
>> different name?
>> Tchau, obrigado
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