[PD] Help with reverb design and vanilla's abstractions ([rev1~]/[rev2~]/[rev3~])

[Alexandre Torres Porres]

like this: https://valhalladsp.com/category/reverb/ ?
yeah, seems like a good discussion going on ;)
cheers

Em ter, 12 de mar de 2019 às 03:49, Matt Davey <hard.off at gmail.com>
escreveu:

> 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.
>
> https://valhalladsp.com/blog/
>
>
> On Tue, 12 Mar 2019 at 12:02, Alexandre Torres Porres <porres at gmail.com>
> wrote:
>
>> 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:
>>> https://ccrma.stanford.edu/~jos/pasp/Prime_Power_Delay_Line_Lengths.html
>>> .
>>>
>>
>> awesome
>>
>>
>>>  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?
>>
>>
>>> Ciao,
>>> Dario
>>>
>>
>> Tchau, obrigado
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