Stereo Tool

For you all who like testing, posted a new preset in the right section of this forum.
Thinking about making another tubevid with this one, so it has to be sublime

Please leave a comment, so i know what to change if necessary.
Comments are highly appreciated

viewtopic.php?f=10&t=4803

This preset is with the new composite clipper enabled.

Thanks you all...

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Since there is like a "bug" for bass clipping when new FM clipper is used and also because big delayed clipping, first what is needed is
- Always clip deep bass to -1.94
- Delay clip level 1.72
- Drop to no clipping bit more.. like 350Hz

For the rest i need to listen more

Time to make a TODO list!

1. Move or copy (same as Stokkemask filter) composite clipping and SSB settings to FM section.
2. There was a complaint in the beginning of this thread that there were 'shrill' sounds heard due to the changes in highs clipping. That's still not resolved.
3. Perform same performance optimizations in traditional clipper; remove 'Stronger clipping' slider once that's finished.
4. Check bass and mid clipping issues reported by Bojcha.
5. Check clipping bug when clipping a 20 Hz bass tone and set bass clipping (in code) from traditional to MPX clipping. Why is the output level higher??

Ad. 4: Clipping is set to 'traditional' clipping for both bass and midbass. But levels are not adjusted to make room for the pilot and RDS signals. Also, potentially stereo bass will not be clipped optimally. However, if I want to use composite clipping for the (mid)bass as well, I need to fix a bug (currently multi-threading gives different output levels, I don't know yet why), and bass clipping strictness must be greatly increased, leading to a much higher CPU load - so this is probably not a very good idea. The simple solution is to adjust the clipping level to make room for the MPX signal. (Stereo pilot 9% + RDS 4.5% means that there's 13.5% headroom needed, so for default settings that means the clipping level must be multiplied by 86.5%.)

Issues #4 and #5 should be fixed now; building new version.

Also performed some small performance improvements (probably not even noticeable).

Issues 4 and 5 from the todo list are fixed.

Stand alone: http://www.stereotool.com/download/ster ... 20-010.exe
Winamp DSP: http://www.stereotool.com/download/dsp_ ... 20-010.exe
VST: http://www.stereotool.com/download/vst_ ... 20-010.dll

Note: "Performance: Not low freqs" and "Traditional bass/mids clipping" have a very similar effect, and I should probably remove one of them. For now, keep them both OFF to have composite clipping on ALL frequencies, turn the Traditional setting ON for standard clipping on bass/mids (but at a slightly lower level to compensate for expected pilot/RDS levels). You can also turn 'Performance' on to do even more things in non-composite mode; enabling both gives the best performance.

IMPORTANT: To get a good sound from the composite clipper:
1. Enable it It's an option under Advanced Clipper
2. Under Advanced Clipper -> CPU, set 'Strictness' at 11 or higher (higher is better; there's probably not much gain above 15 anymore though; 11 looks pretty good already so a bit lower values should still be ok).

Warning:
You will need a license update to use this! Otherwise the 'unregistered options in use' thingy will pop up, and you'll get messages through the music (every 4 hours).

DONE:
4. Check bass and mid clipping issues reported by Bojcha.
5. Check clipping bug when clipping a 20 Hz bass tone and set bass clipping (in code) from traditional to MPX clipping. Why is the output level higher??
Ad. 4: Clipping is set to 'traditional' clipping for both bass and midbass. But levels are not adjusted to make room for the pilot and RDS signals. Also, potentially stereo bass will not be clipped optimally. However, if I want to use composite clipping for the (mid)bass as well, I need to fix a bug (currently multi-threading gives different output levels, I don't know yet why), and bass clipping strictness must be greatly increased, leading to a much higher CPU load - so this is probably not a very good idea. The simple solution is to adjust the clipping level to make room for the MPX signal. (Stereo pilot 9% + RDS 4.5% means that there's 13.5% headroom needed, so for default settings that means the clipping level must be multiplied by 86.5%.)

TODO:
1. Move or copy (same as Stokkemask filter) composite clipping and SSB settings to FM section.
2. There was a complaint in the beginning of this thread that there were 'shrill' sounds heard due to the changes in highs clipping. That's still not resolved.
3. Perform same performance optimizations in traditional clipper; remove 'Stronger clipping' slider once that's finished.
6. Replace DIV_PS by RCP_PS + MUL_PS in new clipper
7. Check holes in center of bass -> might be better with new clipper
8. Interesting observation: For Strictness settings below 7 (9 internally), the old clipping method works better than the new. So, it might be interesting to try to combine the two - that would again result in less steps. Not sure though what will happen to quality (I think the new clipping method is slightly better than the old one for that).

Hans, is it possible to change something in ST FM out, when using this output and not enconding nothing sound is normal L,R but still 4x oversampled, could be than switched automaticly to normal samplerate or some button for this? (because normal output don't have pre-emphasis)

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Urban Junglist

something new in beta 11?

Will post that later, was version needed because I'm helping a station converting 10 transmitters to composite clipping (including calibration) tonight.

Let me know if you need help