I noticed that inside Logic I really like the HPF used inside the Clip Distortion Plugin and I sometimes even use it without touching anything else. It seems that the fc value is modified to improve its practicality which is also input gain dependant. I.e. just looking at the 20K setting with a -30dB gain setting , the standard ASPIK high pass equivalent is around the 2300hz range for the same -ve dB setting.
Looking across some different settings it seems to follow a form of a skewed bell curve which vs the gain input [-30,30].
Does anyone have any experience with this? I have looked at papers for designs which all seem similar so my thoughts are that (excluding table lookup for optimsation later) a governing equation takes the input Feq and Input gain and it returns a 'fixed' fc value which is then used.
High Shelving Filter I meant, not high pass. doh.
So I have been playing around with a Q-variable High Shelf filter along with the highshelf inside the IIR plugin. Compared to Logics High Shelving filter I can get close using various parameters but I can find no logical relationship as the frequency and gains change inside the Logic high shelving filter.
Has anyone else looked into other types of high shelving filters? I am wondering if this is some sort of combination filter?
I believe you are right. I had an inkling that there was some sort of fx(Q,FC,DB) relationship which I have tried to systematically investigate.
I have came across some high shelf filter equations that incorporate either a slope or Q factor input which I am now analysing.. Q does not seem to show too many similarities to the Logic High shelving filter yet but today I am looking into the slope instead.
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