Loudness Meter-Comparison Tool - EBU R128

[Youlean]

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.

[Exo]

Nice, thanks!

[RJHollins]

Hi Youlean,

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

Are you using the EBU R128 as the reference ??

[Youlean]

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.

[RJHollins]

hmm .. will check this out ! Look forward to this

[Youlean]

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..

[RJHollins]

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

[Youlean]

Try this... You must select ASIO output...

[RJHollins]

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].

[Youlean]

Ok. Can you do a screenshot?