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Why does HPF with an EQ increase amplitude?

VST, AU, etc. plug-in Virtual Effects discussion

Moderator: Moderators (Main)

KVRist
 
329 posts since 27 Nov, 2011

Postby padillac; Sun Feb 24, 2013 8:24 am

awesome, thanks for the link. I will now read through that big ol thread and report back here if there's any info as to WHY the amplitude increases, and where the audio energy gets shuffled to/from.
KVRAF
 
1636 posts since 10 Feb, 2008, from Berlin, Germany

Postby Nokenoku; Sun Feb 24, 2013 8:30 am

I actually edited my post to add some more information:
http://www.kvraudio.com/forum/viewtopic ... 46#5260046

Hope, that helps.
KVRAF
 
1584 posts since 22 Apr, 2011, from The House of Zaid

Postby @midnight; Sun Feb 24, 2013 9:05 am

This is a great topic. I had the same question myself when i was trying to remove low end to increase headroom in my mix, and it ended up increasing my amplitude!

I wonder if an true analog filter would have the same effect?
Has anybody ever really been far even as decided to use even go want to do look more like?
KVRAF
 
1636 posts since 10 Feb, 2008, from Berlin, Germany

Postby Nokenoku; Sun Feb 24, 2013 9:06 am

Of course.
They work after the same principles.
KVRian
 
749 posts since 30 Oct, 2005

Postby kvaca; Sun Feb 24, 2013 11:36 am

padillac wrote:linear phase mode still increases the amplitude.

no,its not true /or it must be extremely rare,because Im using LPeqs every day more than 6 years and so far such situation never happened to me/

edit-the only situation imaginable where it can happen is with some electronic drums...here it can be possible as this is the only instrument I cannot withstand so cannot verify...

edit2-luckily I have found some old audio demo with electronic kick drum only I used for some compression testing and I have to accept that you were right...to some degree /but not more than cca +0.2 db peak level increase - which shouldnt be a big problem/

so the final answer for you: its probably because of filters resonance as LP eqs exhibits zero phase shift...
KVRist
 
329 posts since 27 Nov, 2011

Postby padillac; Sun Feb 24, 2013 1:18 pm

yes, totally true! see for yourself. fabfilter pro-q and dmgaudio equality, both in linear phase mode. they each add about 5db of gain when the cutoff gets to 1khz, and it goes down a bit when I move the cutoff up to 3khz. This break is using Impact Soundworks Groove Bias acoustic drum samples, processed a bunch.

http://www.youtube.com/watch?v=8RJXN3q4e-c
Banned

Postby T Roll; Sun Feb 24, 2013 1:35 pm

kvaca wrote:...LP eqs exhibits zero phase shift...


linear phase eq exhibits linear phase shift
zero phase has zero phase shift
KVRian
 
749 posts since 30 Oct, 2005

Postby kvaca; Sun Feb 24, 2013 3:11 pm

T Roll wrote:
kvaca wrote:...LP eqs exhibits zero phase shift...


linear phase eq exhibits linear phase shift
zero phase has zero phase shift


well,since Im not any dsp expert I have to believe what LP eq dev claims:

Conceived and created with Mastering in mind, Linear Phase EQ preserves your original musical balance while providing precision control over the harmonic spectrum with absolutely zero phase shift.

Read more: http://www.waves.com/Content.aspx?id=207#ixzz2LrS3u4iB
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