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 Post subject: Re: Stereo Tool 9.00
PostPosted: Sun Jul 15, 2018 2:38 pm 

Joined: Sat Nov 10, 2012 2:16 am
Posts: 91
Location: Australia
Hans,

Capture of MPX directly from Stereotool...
Attachment:
Capture1.JPG
Capture1.JPG [ 22.64 KiB | Viewed 1864 times ]
Capture of MPX from MicroMPX output...
Attachment:
Capture2.JPG
Capture2.JPG [ 24.54 KiB | Viewed 1864 times ]
Along with the weird audio rolloff at around 10k to 16k, I also see spikes around both sides the pilot with it occasionally modulating it to around 0.3%

Just wanted to make sure this is normal behavior of MicroMPX or not?

Thanks

Rossco


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Sun Jul 15, 2018 6:08 pm 
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Joined: Mon Mar 17, 2008 1:40 am
Posts: 10068
Quote:
Hans,

This is from my Windows 7 x86 machine when I try to install:

Faulting module name: MicroMPX_Decoder_BETA902-011.exe, version: 0.0.0.0, time stamp: 0x5b48cac5
Exception code: 0xc0000409
Fault offset: 0x000ed372
Faulting process id: 0x8b0
Faulting application start time: 0x01d41c32f711a199
Faulting application path: <Path> MicroMPX_Decoder_BETA902-011.exe
Faulting module path: <Path>\MicroMPX_Decoder_BETA902-011.exe
Report Id: 355bb6f0-8826-11e8-89fd-1c1b0d00c116


Works fine on my Win 10 64 bit machine.

C.
*Probably* the same issue that was reported by others - we know the issue and will fix it tomorrow. (There's no workaround at this point).


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PostPosted: Sun Jul 15, 2018 6:08 pm 
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Joined: Mon Mar 17, 2008 1:40 am
Posts: 10068
Quote:
Hi Hans,

Thank you for the fix on the multiband clipper. I was able to set my clip levels with better ease. However, there's one thing that I noticed, and I'm not sure if this is by design or a slight oversight, but the Band Mix controls now seem to drive the clipper's input. Any band mix cut/boost will change the attentuation in the clippers respective to threshold. Previous to the addition of the clippers, the band mix controls only adjusted the output signal from the multiband compressor/limiter, basically to re-EQ the sound without adding more density. So from what I'm seeing now, the signal flow is; Limiter > Band Mix > Clipper. In the Quick Overview panel, it shows the flow as Limiter > Clipper > Band Mix. So I'm wondering, is the clipper supposed to be inserted after the band mix controls, or inserted before them? Probably before the band mix controls would be better?
Ah! That's indeed an oversight. Will look into it.


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Sun Jul 15, 2018 6:11 pm 
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Joined: Mon Mar 17, 2008 1:40 am
Posts: 10068
Quote:
Hans,

Capture of MPX directly from Stereotool...

Capture1.JPG

Capture of MPX from MicroMPX output...

Capture2.JPG

Along with the weird audio rolloff at around 10k to 16k, I also see spikes around both sides the pilot with it occasionally modulating it to around 0.3%

Just wanted to make sure this is normal behavior of MicroMPX or not?

Thanks

Rossco
The weird rolloff is normal, the spikes are not though. What do they look like exactly?


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Sun Jul 15, 2018 9:37 pm 
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Joined: Wed Nov 19, 2008 7:44 pm
Posts: 1127
Location: Bulgaria
And why is this "rolloff" ? As i see , this is a big amount of dB down, may be 20-25 dB. And even that from 10K above !? Is this sounds like "without highs" ??

On purpose or no bandbwidth ? I think this will not sound good...


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Sun Jul 15, 2018 10:21 pm 
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Joined: Mon Mar 17, 2008 1:40 am
Posts: 10068
Quote:
And why is this "rolloff" ? As i see , this is a big amount of dB down, may be 20-25 dB. And even that from 10K above !? Is this sounds like "without highs" ??

On purpose or no bandbwidth ? I think this will not sound good...
No. Where do you even see 10K? There's extra stuff above 15K. That's all. Nothing is removed.


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Sun Jul 15, 2018 11:30 pm 
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Joined: Wed Nov 19, 2008 7:44 pm
Posts: 1127
Location: Bulgaria
Quote:
Quote:
And why is this "rolloff" ? As i see , this is a big amount of dB down, may be 20-25 dB. And even that from 10K above !? Is this sounds like "without highs" ??

On purpose or no bandbwidth ? I think this will not sound good...
No. Where do you even see 10K? There's extra stuff above 15K. That's all. Nothing is removed.
Ow, may be i was "slipped" from his post but if i look closely - yes, it`s above 15Khz..

Is it something like the 100Hz "step" in the ST? But bigger step. And the serious question is : Why ? It looks like "unwanted signal" . I mean: It`s an additional bandwidth, which means additional calculations, additional CPU timing( it may be not so much but..).
At least an option for "turning OFF" will be good ? What ya guys think about it?!


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Mon Jul 16, 2018 10:01 am 
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Joined: Tue Sep 15, 2015 12:22 pm
Posts: 336
Quote:
I mean: It`s an additional bandwidth, which means additional calculations, additional CPU timing( it may be not so much but..).
No, that's not how it works. µMPX is not a lossless codec. The rolloff is a side effect caused by the compression algorithm (which does not introduce MP3-like artefacts, but only white noise which is masked by FM anyway). The codec will never remove highs.


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Mon Jul 16, 2018 10:57 am 
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Joined: Wed Nov 19, 2008 7:44 pm
Posts: 1127
Location: Bulgaria
Quote:
Quote:
I mean: It`s an additional bandwidth, which means additional calculations, additional CPU timing( it may be not so much but..).
No, that's not how it works. µMPX is not a lossless codec. The rolloff is a side effect caused by the compression algorithm (which does not introduce MP3-like artefacts, but only white noise which is masked by FM anyway). The codec will never remove highs.
Thanks, looks more clear now.


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 Post subject: Re: Stereo Tool 9.00
PostPosted: Mon Jul 16, 2018 11:24 am 

Joined: Sat Nov 10, 2012 2:16 am
Posts: 91
Location: Australia
Quote:
The weird rolloff is normal, the spikes are not though. What do they look like exactly?
Here is a 5min hold.
Attachment:
Capture4.JPG
Capture4.JPG [ 10.38 KiB | Viewed 1639 times ]
The average peak is just below -72 on MPXTool but I have seen ones peak around between -72 and -60 that also seem to modulate the the pilot up to 0.5%
Does not seem to upset anything - audio quality/power is still as good as original.
From reading I can assume it is simply codec related.

Q: You are creating a clockshift_log.txt file - are you wanting them to uploaded somewhere to review or are they there just for debugging purposes?

Rossco


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