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Fixed SC for NAT

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Fixed SC for NAT

Postby yr » Thu Sep 15, 2011 12:15 pm

After making a lot of tests with NAT, I think Nebula sometimes has problems dealing with high levels of sub-frequencies. It gets worse when presets have high levels of distortion, resulting in audible clicks even when using relatively low input levels (-12dBFS and lower).

My question/request is- assuming that this issue can't be solved, is it possible to add a built-in fixed sc feature in NAT, so that users/developers can create presets that do not process the extreme low end? having this feature will make it possible to achieve much higher THD with less artifacts.

For those interested, I tested some commercial presets with the VTT (only the -6dBFS repetition). In the link below you can hear how 3 presets behave with low frequencies. The middle sample (only) is from a compressor. The other 2 presets have relatively high levels of THD.

https://www.wetransfer.com/dl/s6oj4IM6/ ... 79b130f217
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Re: Fixed SC for NAT

Postby enriquesilveti » Fri Sep 16, 2011 9:03 am

http://www.acustica-audio.com/forum/ind ... =viewtopic

Dynamic section
-Repeats: to select sampling repeats.
-Space(s): to select how many seconds of space between Volterra test tone.
-Number: to select how many Volterra test tone will played.
-Steps (dB): to select the level between those Volterra test tones.
-Cut (Hz): to select the frequency of a Hi pass filter for real space sampling.
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Re: Fixed SC for NAT

Postby yr » Fri Sep 16, 2011 9:52 am

enriquesilveti wrote:http://www.acustica-audio.com/forum/index.php?f=18&t=898&start=0&rb_v=viewtopic

Dynamic section
-Repeats: to select sampling repeats.
-Space(s): to select how many seconds of space between Volterra test tone.
-Number: to select how many Volterra test tone will played.
-Steps (dB): to select the level between those Volterra test tones.
-Cut (Hz): to select the frequency of a Hi pass filter for real space sampling.


Thanks Enrique. Does that mean that the preset will be HP?- what I'm looking for is being able to create a preset that does not process the sub-bass (not removes it), but I'll try this solution for now

Edit: I tried it- the HP makes things worse, probably because when you play a file with sub-frequencies the engine has no useful information. I think to make it work something needs to be changed in the playback engine- add an option to bypass the sub-frequencies.
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Re: Fixed SC for NAT

Postby enriquesilveti » Sat Sep 17, 2011 7:02 pm

Maybe you can edit the preset to add SC and send a LPF with the SC signal in order toe avoid Nebula overload and distortion
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Re: Fixed SC for NAT

Postby yr » Sat Sep 17, 2011 7:32 pm

enriquesilveti wrote:Maybe you can edit the preset to add SC and send a LPF with the SC signal in order toe avoid Nebula overload and distortion


Thanks- I'll try the sc in the daw. Only problem is that it's not very practical (creating a quadro group for every preset with high levels of THD). I will check to see if this solves the problem though, because if it does it could be interesting for a future update.
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Re: Fixed SC for NAT

Postby giancarlo » Sun Sep 18, 2011 12:11 am

the preset will not be highpassed, but low frequency content will be linearized, nat will start playing testtones from higher frequencies and your hardware will not go crazy any more cause low frequency energy (eg tapes, compressors)
This is not linked to nebula engine, you still need highpassed sidechain for processing audio with a big amount of low frequencies. It's possible we'll add a low quality highpass filter in our engine for driving envelope followers
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Re: Fixed SC for NAT

Postby yr » Sun Sep 18, 2011 7:47 am

giancarlo wrote:the preset will not be highpassed, but low frequency content will be linearized, nat will start playing testtones from higher frequencies and your hardware will not go crazy any more cause low frequency energy (eg tapes, compressors)
This is not linked to nebula engine, you still need highpassed sidechain for processing audio with a big amount of low frequencies. It's possible we'll add a low quality highpass filter in our engine for driving envelope followers


Great! thanks Giancarlo.
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