AllPass filter scriptnode

[Sawer]

Hello Everyone.
Trying to figure out how to create a simple Allpass filter from scratch (Schroeder Scheme attached below) .
I've arrived only on creating the feedback (with receive/send modules), but not the feedfoward.
Any help is greatly appreciated.

[dustbro]

This link has all of the Difference Equation and Z Transform info you need:
https://www.dsprelated.com/freebooks/pasp/Allpass_Filters.html?msclkid=457f27add16b11ecaf01c6d97b7edabc

[dustbro]

I believe there is also an allpass node in scriptnode as well

[orange]

@dustbro said in AllPass filter scriptnode:

I believe there is also an allpass node in scriptnode as well

There is an AllPass filter in Linkwitz Riley node, maybe it helps.

[Sawer]

@dustbro @orange Thanks . The issue is that in the scriptnode Allpass filter, I'm not able to change the the amount of samples in the delay buffer. I can only change the frequency. In any case I will retry again . thanks
@dustbro Already done sone reading in the website but without any positive result. I'm just looking for a simple snippet to start from. But thanks for the reference

[ustk]

@Sawer this has to be done in SNEX, because I reckon the send/receive nodes introduce a delay of one sample…
Here are some C++ you can translate:
https://www.kvraudio.com/forum/viewtopic.php?t=416031

[Sawer]

@ustk Thanks

[Christoph Hart]

Not sure if it works, but isn't a forward feedback not just a signal splitter before it goes into the delay?

[Sawer]

@Christoph-Hart Interesting!! Thanks A lot!
Will try on that now. I tried to use the multiplier but wasn't working. Probably because the setup wasn't right.
Was doing some more research and I've found this accurate schema of the Allpass filter.

Tried to implement this but I was having problem in value conversion and using math function.

[Sawer]

@Christoph-Hart What's the difference between the fix core delay and the jdelay?

[orange]

@Sawer said in AllPass filter scriptnode:

@Christoph-Hart What's the difference between the fix core delay and the jdelay?

All of the nodes with "j" prefix is from the JUCE library.

[Sawer]

@orange Thanks man! Appreciate.