Measure True Peak of entire 5.1 audio file

[alang123]

I am looking to measure the TP for a 5.1 audio file. I need to do this for Dolby Atmos loudness specifications. So doing an amplitude analysis and getting the TP for each channel doesn't help.

I can do this in Pro Tools (audiosuite/offline analysis) using iZotope's Insight but I was hoping to find a way to do it in Audition. Is it possible?

[SteveG_AudioMasters_ · Accepted solution]

If you open the 5.1 file in Waveform view, and open the Ampliture Statistics, the true peak amplitude is the second entry. If you select the whole file and scan it, it will analyse each channel separately, display them in a row, but still give you a true  peak values for each. Pretty easy then to spot which channel the highest peak is in.

[alang123]

Thanks for the input. I think my original understanding was wrong in that the Atmos requirement was the measurement of a TP for the entire file, not individual channels. But I think it IS on a per-channel basis, so no channel can exceed -1dBFS

[alang123]

Hi Steve, I will follow up with a related question if that's ok. I scanned a 5.1 audio file (90 minutes in length) to measure the TP on each channel. The centre channel measured -0.84dB but when I checked that point in realtime with iZotope's Insight it measured -1.75dB. I made a smaller section around the area of the TP and scanned again, and I got -1.75. Any reason why this might happen?

[SteveG_AudioMasters_]

Differences that small are usually down to the data window width, and whether a system is is using a full scale sine or a square wave as the 0dB reference point. You can alter this for Audition in the RMS settings tab of Amplitude Statistics.