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Modified High Pass Filter
February 26, 2021 - 8:02 pm
Member Since: February 21, 2020
Forum Posts: 51
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Hello everyone. 

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.




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