Stereo Tool

@ DJ Doggy: The Stereo Tool spectral graph shows the same thing as MPXviewer, both go down to -90 dB. So if you see these things in Stereo Tool's display as well, they are there... Otherwise I'm not sure. (They were there in most of the older BETA's though!).

If they are there, are you using the 'Composite Limiter', and if so, is it set very aggressively? I think you shouldn't set it much higher than around 105%.

Reasons why this can happen when sending data to MPXviewer:
- The audio is coming out too loud (this can happen for example if you are using FM Calibration; lower the output level in that case!). This could very well be the case, given the fact that I also see something like a 'constant' noise level (darker green) where there should be silence.
- The sample rate is incorrect. Say you're outputting 176.4 kHz and MPXviewer (and VAC) work on 192 kHz, then it depends on some Windows audio handling how the data is converted - and my experience is that this is not very good (if I play a single high frequency sine wave I see about 5 when I read the data back via VAC!)

About the sound card output level: 1.000 is NOT necessarily correct! You should check with your transmitter which setting you need! (For mine I need to set it around 0.300).


By the way, given the fact that the 'noise' is below -60 dB (normally far below the noise level when you receive a station) and for frequencies that are difficult to hear anyway, it SHOULD not be that much of a problem. But they shouldn't be there (and on my end they are not there).

Hans you should create a standalone mpx viewing tool!

Btw I couldn't find MPXviewer on google

That's in ST display (FM Mode)

Ah sorry, MPX Tool. I never use it so I didn't know the exact name

Anyway, I've thought of doing that, but:
1. There is already a very good tool available. I don't see what I could add to that (well, maybe RDS decoding )
2. It would take time, and I already don't really have enough time to spend on Stereo Tool... (See all the requests that are coming in that I don't have time to work on). If I did have time I would have made a viewer anyway, just because it's fun to do so - but I just don't...
3. I DID add a display in Stereo Tool, so you CAN immediately see the frequency content of what Stereo Tool is sending out.

Hans,
no underestimation!.. but MpxTool is very complex peace of software.
--

I have one question about Phase rotator, i think something is not good there, or to leave it for the next version?

Hans, mpxtool is also very expensive, but yeah RDS decoder would be cool

For now, is it possible to get stereotool standalone to save the raw audio output directly to disk in something like a wave file rather than relying on 3rd party program to 'pipe' the audio?

The best protection against that kind of mistakes would be the individual naming of every Beta build inside the window title bar.
Every user can do it with a simple editor (like I do -> search for "5.02" and edit the window title), but it would be easier if Hans would do it for us.
Here you see Beta50 Michi build with changed Multiband frequencies (-> search for "16K" to find the frequencies and edit these):

Of course this is a question only Hans as author can answer.

Obvious there is already so much complexity (and complication) for the changed loudness settings and options to finish this Beta project and get to the final 5.10 release, that an extra (detailed) discussion about Multiband frequencies would make this a never ending story.
So let finish Hans first the most important things and then we have something for the future.
I don't think that my idea with 1.4K-4K-8K-15K is already the best of all possible solutions (I took it out of the blue).
Especially I think that some bands have to be very narrow (8K for sure).
But in this special Beta 50 Michi build 8K is very broad.
So I am really looking forward to a detailed Multiband reform discussion for a Stereo Tool V6 beta in the future, but not now.
Best solution would be if you can change frequencies (and bandwith ?) inside .STS !

I found the problem.... Try with Standalone version and found that input sample rate is 44100 .
when i put it to 192000 then this problem is missing . BUT.......
The player with DSP plugin how to work with input SR 192000 when the song sample rate is 44100 or 48000 ..for MP3 let`s say. When song is recorded with 44.100 How WINAMP plays it to 192 KHz ? I mean that in DSP version or VST there is no input Sample Rate setting, input sample rate is song`s sample rate....
So input sample rate should not affect the output sample rate ! Output sample rate is formed in the ST .... if not - then this is a sample rate BUG

If you don`t trust me try Winamp with DSP StereoTool , VAC at 192000 ST output , then this VAC is Input to MPXTool and in MPXTool output to Soundcard. Play some MP3 and see.... what MPXTool is graphing.

Then go back to the Standalone version and try the absolutely SAME scheme ( Use second VAC to set output for winamp this can be 44100 no problem , then input it to ST Play again the same MP3 and simply set the input sample rate in StereoTool to 192000 and that`s it the problem is GONE put it back to 44100 and here we go again
But REMEMBER to USE maximum levels from ST everywhere set to x1.00 (post amp and "FM Transmitter" panel too. Otherwise this probLem is down there and MPXtool is not able to see it.

Hans, another thing that might be very handy with the stereo expansion, tape restoration etc would be a X-Y Plot

Like the thing on this page http://www.motu.com/products/motuaudio/ ... stics.html
You can perfectly see stereo image and phase issues on this.
Shouldn't be that hard to make.
The time I tried mpxtool I found that to be missing. I don't understand as it is an essential thing to see how your channel correlation is.

It is even on this reasonable priced Marantz fm tuner http://www.audio-extasa.eu/popup_add_image.php?pID=664