Stereo Tool

I'm now building a version with working 'low quality low latency output'.

There are 3 things left on the todo list, the most important (for quality at least) is the Trumpet filter. I've done some comparisons with trumpet sounds between v4.22 and the latest version, and while v4.22 has far more harmonics distortion, the latest version still sounds worse, because it suffers from vibrating distortion which is (at least in my opinion) far more annoying, especially because it occurs at very high frequencies (for trumpets, with bass).

I'm currently experimenting with several filters to see what they do - I don't think I should restore the v4.22 filter because it also causes a lot of distortion. (I think I might have already found a new filter that outperforms the one in v4.22, but I'm quitting for today - will get back on this tomorrow).

Uploaded as BETA3. No further changes. (So the only change is that in the stand alone version, Low Quality Low Latency output is working again now).

Next step will be the Trumpet filter, or something with a similar effect.

did the check on the netbook and it come up as the following.

echo %NUMBER_OF_PROCESSORS% = 2 ( but its 1 CPU )

N270 INTEL ATOM hyper threading echo %NUMBER_OF_PROCESSORS% = 2 HOPE THIS HELPS

Hi Hans,
Maybe you can think about "phase rotating" filter in same time when you think about "trumpet filter" i think this two is related and this two together can do much.

I can prepare few samples, i already know which trumpet songs and voices has bad phase. (?)

Hi Bojcha,

I think the non-linear highpass filter might already do what you're requesting here...

Phase rotating would definitely be a solution for the trumpet filter... But I'd like to be able to fix it without using phase rotation (among others, because already compressed audio often already has an 'optimal' phase rotation shape, so changing it might actually make things worse). It might be a good idea to create a dynamic phase rotating filter

I have one track ("James Last - Dance The Night Away") that someone mentioned earlier where there are some really bad trumpet sounds (HUGE spikes in the waveform), combined with bass, which sounds really horrible. Although I should add to that that I just compared the latest Beta with v4.22, and when I'm using headphones, v4.22 wins without any doubt, but on my speakers the latest Beta sounds cleaner and closer to the original. So I definitely shouldn't add the v4.22 trumpet filter again.


In a moment I'll post a new version where I've made some changes to the loudness filter, that should slightly (very slightly) reduce certain artifacts. Still these trumpet sounds remain bad (probably slightly better than before), so I still have to find a better solution.


Edit: I just tried the non-linear bass with these trumpet sounds, but it doesn't seem to help. Actually that makes sense: In case of these trumpet sounds, the phase shift should be in the (very) high frequencies, and the non-linear bass causes it mostly in the low frequencies.

Ok:

New version with slightly changed Loudness filter:
Winamp DSP plugin: http://www.stereotool.com/download/dsp_ ... _BETA2.exe
Stand alone version: http://www.stereotool.com/download/ster ... _BETA2.exe
VST version: http://www.stereotool.com/download/vst_ ... _BETA2.dll

Previous version:
Winamp DSP plugin: http://www.stereotool.com/download/dsp_ ... _BETA3.exe
Stand alone version: http://www.stereotool.com/download/ster ... _BETA3.exe
VST version: http://www.stereotool.com/download/vst_ ... _BETA3.dll

The changes in the Loudness filter should improve the sound quality slightly, but it also has an effect on the CPU load. So if no-one hears a difference, I'll remove it again. I expect the highs to sound a bit cleaner.

example 1
http://www18.zippyshare.com/v/12215439/file.html
There is same sample sound pic thru ST and thru Breakaway (with bypass ON).. so kind of "phase thing" there even with bypass ON.

Hi Bojcha,

What happened to the sound in BreakAway? You say Bypass ON, but the signal looks changed. (If I feed it through Stereo Tool with Loudness on though, it looks a lot like that - I'm not getting the output in your picture.)

The sound is very much like what I'm hearing in that James Last song I mentioned - exactly the same problem.

yes
In breakaway not all filters are turned off in bypass mode, like that phase rotating.

I am getting all songs fixed too with iZotope Alloy VST plugin. In limiter sectiong there is Phase rotating 0-100% and best is at 98%

edit: James Last - Dance The Night Away .. i just found song ... iZotope fix this very nice ..