Stereo Tool
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Stereo Tool 6.10
https://forums.stereotool.com/viewtopic.php?t=3065		 Page 54 of 213
Author:  eldoradofm [ Sat May 28, 2011 5:56 pm ]
Post subject:  Re: Stereo Tool 6.10
Is it possible to place the de-clipper after pre-amp?
Because now when i have low input level it doesn't work even when i set "Never consider samples to be clipped if the are lower than:" all the way down.

EDIT: Maybe part of the problem is the "Smart clipping detection: Less greedy" with that one deselected it works better with low input signals. But even then when the signal is even lower it doesn't detect it anymore.
Author:  hvz [ Sat May 28, 2011 6:31 pm ]
Post subject:  Re: Stereo Tool 6.10
Quote:
Just a short think:

Would it be possible to make ST compatible for an Android system? I dont know if the ~1 Ghz CPU on a mobile device could deliver enough power to run ST, or maybe a smaller version without declipper and fm output, or if you even have the ability to compile it for that mobile CPU´s... What do u mean Hans?
LOL... Great minds think alike... Have been looking into this the last week. Unfortunately it doesn't seem possible to process audio that is sent to the output (Google's setup doesn't allow any program to get in between). So if I want to do this I would have to create my own audio player... On top of that, I would have to convert a lot of code. (Stereo Tool already contains 2.2 MB of - hand written - code!).
Author:  hvz [ Sat May 28, 2011 6:32 pm ]
Post subject:  Re: Stereo Tool 6.10
Quote:
Is it possible to place the de-clipper after pre-amp?
Because now when i have low input level it doesn't work even when i set "Never consider samples to be clipped if the are lower than:" all the way down.

EDIT: Maybe part of the problem is the "Smart clipping detection: Less greedy" with that one deselected it works better with low input signals. But even then when the signal is even lower it doesn't detect it anymore.
Hm, where do you get that soft input that is still clipped!? Of course I can allow lower settings of this slider...
Author:  eldoradofm [ Sat May 28, 2011 6:42 pm ]
Post subject:  Re: Stereo Tool 6.10
Quote:
Hm, where do you get that soft input that is still clipped!? Of course I can allow lower settings of this slider...
with radio not all dj's use the output meters that well. So too allow headroom the input is set lower. And some music in the automation can be even lower.
Author:  hvz [ Sat May 28, 2011 6:49 pm ]
Post subject:  Re: Stereo Tool 6.10
Quote:
Quote:
Hm, where do you get that soft input that is still clipped!? Of course I can allow lower settings of this slider...
with radio not all dj's use the output meters that well. So too allow headroom the input is set lower. And some music in the automation can be even lower.
I just realized that for lower input levels, even if detection still works, it differs from detection at higher levels. I know what I need to change - will add it to the todo list.
Author:  eldoradofm [ Sat May 28, 2011 6:57 pm ]
Post subject:  Re: Stereo Tool 6.10
ok thanks i'll check the next beta.
Author:  Vortan [ Sat May 28, 2011 7:50 pm ]
Post subject:  Re: Stereo Tool 6.10
Quote:
LOL... Great minds think alike...
Oh, thank you ;)

You would need to program your own audioplayer? Hmm, and if it only able to play mp3? Maybe there is no need for wma, ogg, ... and all the other formats. Btw, next week i get my new soundcard. It was hard to find one with PCIe connection, not too expensive, 192khz, with good audioquality.
Finally no more onboard sound, i can enjoy the new soundquality. :D
Author:  hvz [ Sun May 29, 2011 1:42 am ]
Post subject:  Re: Stereo Tool 6.10
BETA047:
- Natural Dynamics filter improved: Highs work properly, and there's a 'smoothing' slider to smooth the effect (fixes grainy sound).

From the previous beta (still valid):
The CPU load is also pretty high because I'm calculating 32 different tilt levels to find the best match (so automatic tilt detection works, but it needs serious optimization).

New slider: "Declipping margin" - if you set this to 75%, everything above 75% of the maximum level is considered to be potentially clipped.

Changed slider: "Never consider samples to be clipped if they are lower than:" - rule out soft sounds, whatever they look like, they are not clipped.


Winamp DSP plugin: http://www.stereotool.com/download/dsp_ ... 20-047.exe
Stand alone version: http://www.stereotool.com/download/ster ... 20-047.exe
VST version: http://www.stereotool.com/download/vst_ ... 20-047.dll
VST version (No SSE2): http://www.stereotool.com/download/vst_ ... 20-047.dll
Command line version: http://www.stereotool.com/download/ster ... 20-047.exe
Linux command line version: http://www.stereotool.com/download/ster ... ETA620-047 NOT AVAILABLE
Linux GUI version: http://www.stereotool.com/download/ster ... ETA620-047 NOT AVAILABLE

TODO:
- Fix loading changed multiband frequencies
- Add buffer and filter for SCA output (SCA1 ok, SCA2 ok)
- Finish AGC improvement - make mono value configurable (replace checkbox by slider) 1 hour --> NO, not needed - anything else needed? -> NO
- Fix Punch
- Check what to do with new filters (such as bass AGC) - keep them, remove them, change them? --> KEEP
- Save new BASS_AGC setting in VST mode
- Loudness: Annoying cracking sound in bass. Slightly present in 5.00, worse in 6.00, maybe even worse in 6.10. Only when bass is too loud. Much worse than in Final Limiter (at same input level!) - so this clearly indicates a bug. Most likely cause: The filter that was added to remove bass artifacts....... :shock: - No, it's the louder bass. But it can be fixed by changing some settings. Default settings updated, and behavior for 'not Very strict' improved. Also Deep bass boost and Very deep bass protection are enabled for latency 512 now.
- Fix crash at program close
- Fix VST plugin version (does not run)
- Dynamically drop 'Allow louder highs, even if it causes vibrations' to 0 when bass filter suspects noticeable voice vibrations. 1-2 hours
- Reduce Loudness CPU load days?
- Check and remove static variables
- Finish new de-essing filter (check what to do with the settings, remove at least some!) 1 day
- Convert Multiband input to MONO, then use arrays [2][4096] --> should give speedup. - FAILED
- RDS issue reported here: viewtopic.php?f=15&t=3703&p=11524#p11524
- Always oversample clipping (configurable)
- Declipping filter: Change detection at lower input levels.
- Finish declipping filter (clipping level detection + level reduction in dB). 1. Figure out why removal of unwanted frequencies causes flat lines at high quality setting with small overlap. This causes distortion, with this fixed repairs are MUCH better. 2. Implement MP3 correction, automatically scale down when this deteriorates the sound.
- Update presets? (BASS_AGC etc.) 1 day
- Finish blind interface
- Add AGC start level
- "Test Right Channel" in "FM Transmitter Calibration" does not work since v6.10 (standalone) (bojcha)
- Channels L/R swap in stand alone version when changing filtering/quality (?) (eldoradofm)
- Move pre-emphasis to end of processing 1 day
- Change version number 1 hour
- Release 1 hour
- Add lowpass filter for stereo signal (will cause a lot of extra latency!) - it might be possible to avoid this latency using a Hilbert transform
- Add smarter clipping detection. Maybe something much simpler suffices: Current clipping detection with threshold + flat line detection
Author:  eldoradofm [ Sun May 29, 2011 2:00 am ]
Post subject:  Re: Stereo Tool 6.10
Slider missing in stand alone. ;)
Author:  hvz [ Sun May 29, 2011 2:15 am ]
Post subject:  Re: Stereo Tool 6.10
Quote:
Slider missing in stand alone. ;)
Oops - fix coming up. But it should work pretty well at the default setting.


Edit: Please re-download. Should be ok now.
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