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Loudness Meter-Comparison Tool - EBU R128

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Loudness Meter-Comparison Tool - EBU R128

Postby Youlean » Sun Dec 14, 2014 4:55 pm

This should compare perceived loudness between A and B. I have compared it to the Nugen VisLM-H and it is pretty accurate. It could be useful when you need to measure loudness off distortion. For example, you can connect clean sine wave on A, and limited sine wave on B (just make sure that peak out is the same as A), and to measure how audible is distortion, or you can compare 2 different algorithms for limiter (that's what I need it for), and to see which one gives you less distortions.
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Loudness Comparison Tool.fsm
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Last edited by Youlean on Sun Dec 28, 2014 12:14 pm, edited 2 times in total.
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Re: Loudness Comparison Tool

Postby Exo » Mon Dec 15, 2014 9:59 pm

Nice, thanks!
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Re: Loudness Comparison Tool

Postby RJHollins » Tue Dec 16, 2014 1:11 am

Hi Youlean,

I've not check the schematic as yet ... but wondered ...

Are you using the EBU R128 as the reference ??
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Re: Loudness Comparison Tool

Postby Youlean » Sun Dec 28, 2014 1:22 am

Sorry for late response... Previous version was my attempt of measuring loudness, and it was not working properly because K weighting was not applied. New version does use EBU R128. I have added also a separate loudness measurement tool.
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Loudness Meter-Comparison Tool.fsm
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Re: Loudness Meter-Comparison Tool

Postby RJHollins » Sun Dec 28, 2014 6:42 am

hmm .. will check this out ! Look forward to this :)
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Re: Loudness Meter-Comparison Tool - EBU R128

Postby Youlean » Sun Dec 28, 2014 12:19 pm

Well, I have compared it with Nugen VisLM-H using sine waves with multiple frequencies, and margin of error was 0.2LUFS max. This is probably because K Weighting filter is not 100% same as in Nugen VisLM-H. This should be acceptable margin of error (or at least that's what paper for EBU R128 algorithm says).
Test it and post here results please.. :)
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Re: Loudness Meter-Comparison Tool - EBU R128

Postby RJHollins » Mon Feb 23, 2015 6:44 pm

Just now getting to try this out.

Not sure I'm doing it right, I hooked up a Wave Player to the 2 modules ... hit play, see nothing in the display :?
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Re: Loudness Meter-Comparison Tool - EBU R128

Postby Youlean » Mon Feb 23, 2015 10:18 pm

Try this... You must select ASIO output...
Attachments
Loudness Meter Test.fsm
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Re: Loudness Meter-Comparison Tool - EBU R128

Postby RJHollins » Tue Feb 24, 2015 12:38 am

hmm ... I can hear the OSC [when hooked up]. The Vol knob does its thing.

Still nothing in the display :(

I'm running FS 3.0.4 [hope that's not the issue].
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Re: Loudness Meter-Comparison Tool - EBU R128

Postby Youlean » Tue Feb 24, 2015 5:18 pm

Ok. Can you do a screenshot?
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