Stereo Tool
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Stereo Tool 6.10
https://forums.stereotool.com/viewtopic.php?t=3065		 Page 118 of 213
Author:  eldoradofm [ Wed Aug 03, 2011 3:16 pm ]
Post subject:  Re: Stereo Tool 6.10
And can you check the 48 kHz tone.
All the tones have 100.1% MPX as expected. Only that tone has 93.6% and i checked that it was at 1.00 and that phase was at 0.

EDIT: When i try the same with composite overdrive 105% i don't get 100.1% mpx anymore with the test tones. But i get 99.0% for the test tones and 70.6% for the 48 kHz tone. Hmm... and not all the time 70.6% now. I checked again and it's at 96.3% and when i check again it's at 73.3%. So there's definitely something wrong there.
Author:  hvz [ Wed Aug 03, 2011 7:08 pm ]
Post subject:  Re: Stereo Tool 6.10
Quote:
@Hans... what about Beta79??.. this i have on air... I didnt try Beta84. and i register and load the same preset.!
BETA085 has a new and better sounding clipper. But it also has a much higher CPU load. There's still an issue on my todo list to optimize it further.
Author:  DJ-DOGGY [ Wed Aug 03, 2011 8:34 pm ]
Post subject:  Re: Stereo Tool 6.10
Also a good song for tests ...especially in the beginning with very loud high`s

http://www17.zippyshare.com/v/9199655/file.html
Author:  hvz [ Thu Aug 04, 2011 12:09 am ]
Post subject:  Re: Stereo Tool 6.10
Quote:
The composite limiter is now causing artifacts with the fm transmitter calibration tones.
Is it possible to move the calibration to go after the composite limiter to avoid this?
Hm, the calibration itself IS done afterwards, but the tones are injected earlier. I guess I need to turn the composite limiter off when test tones are played.
Author:  Bojcha [ Thu Aug 04, 2011 12:14 am ]
Post subject:  Re: Stereo Tool 6.10
New AGC faster dwn_spd is not good! i cannot get any good under 200%

Evanescence - My Immortal
Author:  hvz [ Thu Aug 04, 2011 12:22 am ]
Post subject:  Re: Stereo Tool 6.10
Quote:
And can you check the 48 kHz tone.
All the tones have 100.1% MPX as expected. Only that tone has 93.6% and i checked that it was at 1.00 and that phase was at 0.

EDIT: When i try the same with composite overdrive 105% i don't get 100.1% mpx anymore with the test tones. But i get 99.0% for the test tones and 70.6% for the 48 kHz tone. Hmm... and not all the time 70.6% now. I checked again and it's at 96.3% and when i check again it's at 73.3%. So there's definitely something wrong there.
Actually I think something is wrong with the tool that you're using to measure it. I've recorded the Stereo Tool output to a file and opened it in a wave file editor. 48 kHz is EXACTLY 1/4th of 192 kHz, due to that you get the same 8 sample values repeated over and over. So in a zoomed-out waveform it does indeed look a lot softer. But, if you zoom in and the wave editor starts to interpolate values, they suddenly reach the peak level again.

It also makes sense that you get a different behavior each time: The peak level just depends on WHICH 8 sample values you get. So if you start generating the tone again, it might start at a different spot, causing diferent sample values to be generated. However the output of the sound card is indistinguishable!
Author:  eldoradofm [ Thu Aug 04, 2011 12:49 am ]
Post subject:  Re: Stereo Tool 6.10
I tried making test tones with adobe audition. I tested with 53 kHz tone and 48 kHz tone. Both are set to -3dB.
In MpxTool i get exactly 100.0% with both tones, so why is there no problem when i use that? Both files played with winamp trough VAC to MpxTool.

EDIT: Looking zoomed in to my test tones both files have exactly the same audio level.
Author:  hvz [ Thu Aug 04, 2011 12:49 am ]
Post subject:  Re: Stereo Tool 6.10
Quote:
New AGC faster dwn_spd is not good! i cannot get any good under 200%

Evanescence - My Immortal
Ok I hear what you mean. I'm changing the default value to 200%, hope that suffices. (Even at 200% sudden loud spikes are still handled better than before).

For the future, I have a change planned that - if I'm right - should make the AGC much more resilient against volume drops caused by loud voices. Actually it's a pretty simple change - but I'm probably not going to implement it in version 6.20 anymore. Anyway, if that idea works I should be able to lower this value again.
Author:  hvz [ Thu Aug 04, 2011 12:53 am ]
Post subject:  Re: Stereo Tool 6.10
Quote:
I tried making test tones with adobe audition. I tested with 53 kHz tone and 48 kHz tone. Both are set to -3dB.
In MpxTool i get exactly 100.0% with both tones, so why is there no problem when i use that? Both files played with winamp trough VAC to MpxTool.
For 48 kHz, try setting the start phase to 45 degrees. I've just tried it in CoolEdit (older version of Audition) and with start angle of 0 degrees I get a peak level of 0 dB, with start angle at 45 it's -3 dB. The RMS level is identical though (-3 dB).
Author:  Bojcha [ Thu Aug 04, 2011 12:53 am ]
Post subject:  Re: Stereo Tool 6.10
Quote:
For the future, I have a change planned that - if I'm right - should make the AGC much more resilient against volume drops caused by loud voices. Actually it's a pretty simple change - but I'm probably not going to implement it in version 6.20 anymore. Anyway, if that idea works I should be able to lower this value again.
I have some idea and it's very simple actually half is already in current AGC just some changes ... if you want to hear...
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