Stereo Tool
https://forums.stereotool.com/

Low latency secondary input (microphone)
https://forums.stereotool.com/viewtopic.php?t=853		 Page 40 of 75
Author:  hvz [ Sun Feb 21, 2010 9:29 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
When I disable the multiband compressor by unchecking 'ON' in the multiband compressor window, the sound stutters and is all weird.

Here's a recording:
Example (mp3, 240 kB)

At 0:10 second I turned off the multiband compressor.
I noticed that too - will look into it.
Author:  hvz [ Sun Feb 21, 2010 9:40 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
Seems that definitely is better Singleband PreLimiter. BUT! Multiband need to be re-tweaked
New RMS Prelimiter.. sounds now like he's now knows what is doing.
So, RMS Pre Limiter is working properly? I'll then make some changes so it will respond to peaks again instead of lowering the volume slowly, that should improve the sound and enable more aggressive settings again.
Quote:
In the same time i was thinking about bass sounds and i tweaked them always from EQ (after multiband) but that was wrong.
The output level like this is only BASS based so Limiter after that will mostly limit by bass sounds.
That is true, but it shouldn't be too much of a problem: Both the Final Limiter and Loudness handle the bass separately from the rest of the sound, and remove too loud spikes from it.
Quote:
And when is "before multiband" things are better for limiter, but there is no bass sounds that much when was with EQ after multiband.
In fact, "after multiband" is identical to "before multiband" if you increase the 'soft limit' values. It's merely there to simplify things, it doesn't mean that there's any difference in the processing itself.
Quote:
So when i look at eg. Omnia processing they have something like Bass boost or deep bass enhance (bass compressor limiter or whatever) between AGC and multiband, so i gues like that they preserve peek level of bass sounds but again is boosted.
Hm, that might actually be a good idea - I currently have a 'deep bass boost' filter in the Loudness filter, but it could just as well be done much earlier in the processing. Although I'm not sure if that wouldn't cause artifacts.

Does the Omnia deep bass enhance work better or sound different than 'deep bass boost' in Loudness?
Quote:
i Have new preset now for latest beta, it's "constant" but i don't like the fact i must push bass EQ to +5 to +7dB.
If it doesn't cause distortion, I wouldn't worry about it.
Author:  hvz [ Mon Feb 22, 2010 12:03 am ]
Post subject:  Re: Low latency secondary input (microphone)
I've just updated the BETA3's with versions which use about 4% less CPU power. No further changes.
Author:  Bojcha [ Mon Feb 22, 2010 12:27 am ]
Post subject:  Re: Low latency secondary input (microphone)
hi,
Pre Limiter seem to be good and really better and constant. Seems it's faster on suden louder level too.

About bass..
I just measure RMS power for 85Hz sine tone .. and tone from omnia and breakaway. This two are same - Louder! by ~2dB.

sinusoide:
st:
Image

bbp or omnia:
Image

My conviction is that bass Limiter/comressor or booster, whatever it is, is between agc and multiband.
Author:  hvz [ Mon Feb 22, 2010 12:38 am ]
Post subject:  Re: Low latency secondary input (microphone)
Actually what you show in these bass shapes is exactly what Deep Bass Boost does... Except that my Deep Bass Boost stops at around 60 Hz (at higher frequencies it becomes noticeable, bass starts to sound less good).

But it's just a number, so I can easily increase the frequency where it stops.


By the way, Deep Bass Boost is currently located BEFORE the final limiter (even though it's part of the Loudness processing, because I originally implemented it as part of the bass distortion protection). So instead of right before Multiband, it's located directly afterwards.


Could you do the same measurement at, say, 30 or 40 Hz? (Without highpass filter).
Author:  hvz [ Mon Feb 22, 2010 12:48 am ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
Pre Limiter seem to be good and really better and constant. Seems it's faster on suden louder level too.
Great, I'm planning to make it even faster by adding a 2nd layer that quickly drops and increases the output volume if there's too much sound left. On top of that, it uses a bit less CPU processing power.
Author:  hvz [ Mon Feb 22, 2010 12:50 am ]
Post subject:  Re: Low latency secondary input (microphone)
Small oops: The previous upload failed, so the 4% more efficient version wasn't available yet. It is now.
Author:  Bojcha [ Mon Feb 22, 2010 12:58 am ]
Post subject:  Re: Low latency secondary input (microphone)
At 40Hz ST - is lower by 1.8dB on rms (i put bass boost to 100 and eq up) but..

I put images beacuse sinusoide is not same. In ST sinusoide is always regular shape,
in omnia is "shorter" and like hard compressed and it sound like it's little distorted but in music that is not noticeably.
Author:  hvz [ Mon Feb 22, 2010 2:51 am ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
At 40Hz ST - is lower by 1.8dB on rms (i put bass boost to 100 and eq up) but..

I put images beacuse sinusoide is not same. In ST sinusoide is always regular shape,
in omnia is "shorter" and like hard compressed and it sound like it's little distorted but in music that is not noticeably.
Ok, this is odd. I just checked, and at 20 Hz Stereo Tool does generate this type of shape, at 40 Hz I already have to give it a huge boost (+20 dB or so, Pre Amp at x16.00) to get something even close to this. So I think I've set the maximum frequency much lower than I thought, somewhere near 30 Hz probably.

If Orband and BA can go this much higher, I must be able to do the same :-) but I'll probably have to add some extra filters first. (There's a reason why I set the maximum frequency so low...)


Edit: I just realized that my current filter frequency setting might still be based on an earlier filter where the bass sounded off-tune. I'll try tomorrow what happens if I just increase the frequency without making any further changes.

Edit #2: I just discovered a bug: Improved Distortion Loudness Correction: If there's a phase difference in the bass between left and right channel, then the right channel gets deformed very badly (Tested using a 20 Hz tone with 90 degrees difference between left and right). Bug is not present in v4.22.
Author:  Bojcha [ Mon Feb 22, 2010 12:15 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
If Orban and BA can go this much higher, I must be able to do the same :-) but I'll probably have to add some extra filters first. (There's a reason why I set the maximum frequency so low...)
Great!

40Hz:
http://www2.zippyshare.com/v/24675981/file.html
Page 40 of 75 All times are UTC+02:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/