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04-26-2013, 06:26 AM
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#1
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Human being with feelings
Join Date: Apr 2011
Location: Germany
Posts: 1,185
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Anti Aliasing in ReaComp do not work (FIXED)
Hello, I have testet the Anti Aliasing funktion in ReaComp and found out that this do not work. See my test
REAPER v4.33/x64, Win7 Pro SP1/x64
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04-26-2013, 02:17 PM
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#2
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Human being with feelings
Join Date: Apr 2011
Location: Germany
Posts: 1,185
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Here a Video Demonstration how I think Anti-Aliasing should work (from 2:02 min)
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04-26-2013, 09:52 PM
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#3
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Administrator
Join Date: Jan 2005
Location: NYC
Posts: 15,721
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Can you make a video of the same test with ReaComp and AA turned off? The aliasing, while obviously present in the video, does seem to be at least 70-80dB below the peak, which isn't bad (the AA Filter ReaComp uses isn't the steepest, it is trying not to be too harsh on phase).
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04-27-2013, 08:09 AM
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#5
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Administrator
Join Date: Jan 2005
Location: NYC
Posts: 15,721
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Looking into this now, it does seem to not be working, actually. The 2x AA mode actually does seem to have a slight advantage here, but the higher modes do not.
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04-27-2013, 08:25 AM
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#6
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Human being with feelings
Join Date: Apr 2011
Location: Germany
Posts: 1,185
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Quote:
Originally Posted by Justin
Looking into this now, it does seem to not be working, actually. The 2x AA mode actually does seem to have a slight advantage here, but the higher modes do not.
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Thanks to look into this.
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04-27-2013, 09:30 AM
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#7
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Administrator
Join Date: Jan 2005
Location: NYC
Posts: 15,721
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Here's an updated win32 build of reacomp with fixed filters (it only ends up being about 3-6dB of reduction for aliasing, but maybe that'll be meaningful -- otherwise we could look at other filter types too).
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04-27-2013, 10:17 AM
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#8
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Human being with feelings
Join Date: Apr 2011
Location: Germany
Posts: 1,185
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Where can I find an updated reacomp? Is there also a 64 bit version? I'm no expert, and for a clean sound I would suggest better anti aliasing filter.
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04-28-2013, 03:57 PM
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#9
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Administrator
Join Date: Jan 2005
Location: NYC
Posts: 15,721
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Sorry, meant to include a link. Here's the win32 build (sorry, no 64 bit version at the moment). Please give your comments in this thread.
http://landoleet.org/reacomp-win32-aafix.zip
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04-28-2013, 04:16 PM
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#10
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Human being with feelings
Join Date: Mar 2010
Posts: 4,713
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Quote:
Originally Posted by Justin
it only ends up being about 3-6dB of reduction for aliasing
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Surely not for x64? That wouldn't seem worth it
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04-28-2013, 04:55 PM
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#11
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Human being with feelings
Join Date: Apr 2011
Location: Germany
Posts: 1,185
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Thanks for the efforts! I only see a small improvement. I have no idea how that works with the anti-aliasing. Maybe I should just live with it.
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02-26-2017, 04:40 AM
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#12
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Human being with feelings
Join Date: Nov 2010
Location: Mullet
Posts: 829
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i can confirm that "AA" on ReaComp does basically nothing in regards to aliasing.
this is a comparison of ReaComp with/without "AA" (64x)
https://i.imgur.com/AIQ8hge.png
and this is ReaComp with the project sample rate set to 2,822,400 Hz (64 x 44,100 Hz)
https://i.imgur.com/yWpkk3m.png
i would hardly call this issue "FIXED"
Last edited by bezusheist; 02-26-2017 at 06:15 AM.
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02-26-2017, 07:10 AM
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#13
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Human being with feelings
Join Date: Jun 2009
Location: Croatia
Posts: 24,790
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Thankfully there are hundreds of other compressors on the market which have better AA.
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02-26-2017, 07:21 AM
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#14
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Human being with feelings
Join Date: Nov 2010
Location: Mullet
Posts: 829
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well i myself do not use oversampling on any plug-ins, but i figured maybe others do.
it's a little mis-leading to have the option there if it doesn't really do anything.
i would just remove the option.
it just causes confusion and complaints.
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03-01-2017, 03:28 PM
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#15
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Human being with feelings
Join Date: Nov 2010
Location: Mullet
Posts: 829
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filter choice/design is a crucial part to the re-sampling process.
having said that...
ReaComp "AA" filters: green = 2x, red = 64x
Reaper 5.33 Extreme HQ 2x OS filter
again, i don't need this fixed for me because i don't use the AA.
but others who do use it may want it fixed and should at least know that it doesn't really work.
Last edited by bezusheist; 03-01-2017 at 03:59 PM.
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