thanks everyone for all the "reverberation"

Em qui, 7 de fev de 2019 às 09:23, Dario Sanfilippo <sanfilippo.dario@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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