Stereo Tool

Clear! So can't be avoided other sound and it clips more. ok.

Now.. "Clip At" is now, How much Bass will be lowered .. right?
Can you add another one (with freq selection) wich is last one in chain, and settings 80-100%

What i need (and think it will be much better) is to start clip from 90 or 95% limit... not 100% like in this last betas.
it must work good even with freq selection of 350hz to 450Hz.

VERY interesting observation: Of the 1.4 dB drop, about 0.9 dB is caused by the 'clip at 90%', and only 0.5 dB is caused by the voice vibration detection filter. So making that filter more sensitive should have very little effect on the amount of bass, and will probably have a big effect on the audio quality. I'll add sliders for this.

I'll make the clipping at 90% strict again to see if that really improves things. But actually the idea of NOT making it so strict was that I shouldn't be clipping the bass if there's really no need to. So I'm not sure that this is a good idea...

Edit: I think I should also set a limit (90%-95%) for the in-between portion of the audio (above the 'very low' freqs, below the low/high separation); that should improve soft 'S' sounds a lot (they still sound a bit distorted at the moment).


Edit: Planned changes:
1. Add clip value for in-between lows. DONE (default 100%)
1a. Combine very low and low clipping (now separate, may lead to too high peak levels). DONE
2. Make current filter TWICE as sensitive (!!!). Causes far more bass drop, but also far less distortion. DONE, configurable now
3. Voice vibrations are only noticeable if you have 'pure' sounds; by this I mean just 1 voice without other loud instruments (except the bass of course). So I will add a 'purity' measurement and multiply the current filter result by the purity ('1' for completely pure).

I expect the result of these changes to sound very good.

Belive me
Only strict CLIP at 90 or 95%.. with freq selection! All my test shows that other processor have this same in about 0-350Hz then rise to around 400-450.

ah i forgot "Hard Limit" function, much less job for it!

New BETA, now with configurable settings.

Winamp DSP plugin: http://www.stereotool.com/download/dsp_ ... 510-41.exe
Stand alone version: http://www.stereotool.com/download/ster ... 510-41.exe
VST version: http://www.stereotool.com/download/vst_ ... 510-41.dll
VST version (No SSE2): http://www.stereotool.com/download/vst_ ... 510-41.dll
Command line version: http://www.stereotool.com/download/ster ... 510-41.exe
Linux command line version: http://www.stereotool.com/download/ster ... BETA510-41 (not built)
Linux GUI version: http://www.stereotool.com/download/ster ... BETA510-41 (not built)

Changes:
- Better bass filter: Less spikes are left after filtering. This reduces voice vibrations (and probably other distortion as well) a bit.

- Added 4 new sliders:
* Sensitivity boost
The amount of distortion is calculated as a value between 0 (no distortion at all) and (unlimited). You can multiply this value to make the filter respond faster (at lower amounts of distortion). It is clipped at 1 - so if it gets higher than 1 it stays at 1.
* Ignore if below
So now there's a sensitivity value between 0 and 1. Say you set this to 0.5, then distortion value '0.5' is moved to 0 and 1 stays at 1. So at low distortion levels nothing happens.
* Reduce sensitivity for non-constant sounds
If the sound is not constant, voice vibrations are 'hidden' by the changing sounds. The value calculated using the previous 2 sliders is reduced if the original sound was not constant. Set this higher to reduce it more (you'll keep more bass but might get more distortion), or lower to reduce it less.

* Then rize to (static)
This determines the total bass clipping level (very deep bass plus everything below the 'highs vs lows protection' frequencies.) Should probably be left at 100%. (1.00)


For clarity (measured for 'Mina' song):
- Sensitivity boost: Increasing this from 1.00 to 1.50 reduces overall bass level by 0.1 dB, at 1:43 by 1 dB.
- Ignore if below: Reducing this 0.50 0 reduces overall bass level by 0.1 dB, at 1:43 by 1 dB.
- Reduce sensitivity for non-constant sounds: Reducing this to 0.33 reduces the overall bass level by 0.4 db (!), but has hardly any effect at 1:43.

My advice: Set 'Ignore if below' to 0, keep the rest at default values. This reduces overall bass by only 0.1 dB, but much more at difficult parts.

It might help to reconfigure the filtering frequencies... (I haven't really looked at the effect of that yet).

one thing..

"Then Rize to (static)" - I mean really strict! Clip with 0ms attack/release

Nice...

Each day I look into this thread there is a new version and ST sounds better and better.

Keep doin' it!

Greets
Maic

Is it good except for that?
Any comment on the values?


I did notice something else: There are more volume effects (loud 'S' sounds push other sounds down etc.) than a few BETA's ago (before the voice vibrations filtering). This should be easy to fix, will do that asap.

Hans, there's slightly more pumping in this version - beta41. One more thing, there are few tracks (for example: 'If You're Not The One' by Daniel Bedingfield ), which when heard from the FM stations have a solid punchy bass, but in ST the bass, though loud, is reverberating. I turned stereo processing off to see if it has any effect. None! Nor does any parameter in Loudness or Bass Processing Section. The only way I was able to substantially reduce the reverberation in bass was by getting Top Limiter of MultiBand Processing to Limit, but then all other frequencies come rushing in, making the overall sound trashy. Currently I'm using Non-Phase Linear Bandpass filtering as you suggested for improving the bass. Any suggestion for eliminating the reverberation in bass?
Thanks in advance.

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Does reducing Loudness itself help? I'll check this myself later...

Well I found another compelling reason to use Bandpass Filter even though I don't use ST for FM broadcasting. I discovered I can't hear a thing above 17 KHz and I'm 25. I'm going deaf!

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