How to code an IIR Allpas filter for Analouge Phasing?

[philoop]

I don't know enough about IIR filters to actually make one. .

[SmashedTransistors]

You can get some theoretic explanations on JOS homepage:

https://ccrma.stanford.edu/~jos/pasp/Phasing_2nd_Order_Allpass_Filters.html

[ricard]

There are some published allpass filters in this thread:

Jaffasplaffas contributions

New additions - 6 multimode LP BP & HP filters! Search: jaffa/filt/mm6db jaffa/filt/mm12db jaffa/filt/mm18db jaffa/filt/mm24db jaffa/filt/mmlp jaffa/filt/mmhp These filters are my own versions of the factory filters filter/lp1 m & filter/hp1 m made by @johannes, which I really like a lot. I am not 100% sure about if it is the right term, but I think they are first order, which I understand is 1 pole filters, which are 6db filter. And stacking 1 pole filter should then give 12,18,24 db et…

[SmashedTransistors]

Here is a small phaser example based on the tiar/filter/APChain object.

testPhaser.axp (6.6 KB)