Old 09-23-2017, 10:58 PM   #1
future fields
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Hey all,

I was wondering, when I have ReaComp set up as below, is it basically an oversampled clipper?



Note I have the Wet control all the way down, and the Dry knob turned up. I am wondering if the signal is still oversampled this way or if it only oversamples the Wet?

Also, does the oversampling/AA algorithm introduce any latency? I know the plugin does not declare any, but that does not necessarily mean that there is zero latency. From what I understand, completely zero latency oversampling across the full frequency spectrum is not possible.
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Old 09-23-2017, 11:47 PM   #2
bezusheist
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The oversampling in ReaComp does not work correctly.
It's a joke, actually.
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Old 09-24-2017, 12:29 AM   #3
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Quote:
Originally Posted by bezusheist View Post
The oversampling in ReaComp does not work correctly.
It's a joke, actually.
Wow, it's amazing you post this, because I just noticed it.

The oversampling in ReaComp only works at 2x.

Any other setting, does not operate correctly.

Atleast this is the case for me, running at 44.1kz as my sample rate.
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Old 09-24-2017, 01:58 AM   #4
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ReaComp's oversampling is a very poor quality AA filter...it doesn't do anything but a slight roll-off of HF at any rate (2x to 64x). completely in-effective at anti aliasing.
to answer your original question...
it does seem that the dry signal is oversampled as well and there is a 1 sample (un-compensated) delay added from OS.
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Old 09-24-2017, 07:49 AM   #5
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On my tests I notice more aliasing at any oversampling value other than 2x

When I play a very high pitched synth wave and smash it with the ReaComp limiter at 1x, it introduces tons of aliasing (as expected it would), at 2x the aliasing is minimized quite a lot, at 4x and any higher value more aliasing is introduced (should be less and less as it goes higher)
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Old 05-26-2018, 06:01 AM   #6
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I was wondering if anybody else can confirm 2x oversampling is the only oversampling setting that works correctly on ReaComp
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Old 05-26-2018, 06:27 AM   #7
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None of the AA modes work “correctly”.

edit:

frequency responses of 2x (blue) and 4x (white) AA filters in Reacomp...


that should show why there is more aliasing when higher rates (than 2x) are used...
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Old 05-26-2018, 08:20 AM   #8
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I never use the AA at all, but I wonder if that maybe comes before the Limit Output process. Any kind of filter, including oversampling, will tend to undo the action of a hard clipper like that so you end up getting outputs higher than the stated limit. If you're pounding into it with AA enabled, and absolutely nothing ever comes out higher that 0dbFS, then it's probably not actually oversampled at all. Of course, if ocassional peaks do end up above 0, it's not actually limiting, so...
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