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

[Matt Davey]

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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