(Please make you Subject fit one line.) This seems interesting, mostly for speech, being a technical recommendation of the EBU (but surely applies to any signal).
I am not familiar with most of that, but in the meantime, you might want to have a look at how "loudness" is dealt with in Praat https://www.fon.hum.uva.nl/praat/ , a phonetics software specificaly aimed at the study of speech. Jan On Jun 07 09:13:48, sox-devel@lists.sourceforge.net wrote: > "en.wikipedia.org/wiki/EBU_R_128" > "tech.ebu.ch/loudness" > "tech.ebu.ch/files/live/sites/tech/files/shared/r/r128.pdf" > "tech.ebu.ch/files/live/sites/tech/files/shared/tech/tech3341.pdf" > "tech.ebu.ch/files/live/sites/tech/files/shared/tech/tech3342.pdf" > "tech.ebu.ch/files/live/sites/tech/files/shared/tech/tech3343.pdf" > "tech.ebu.ch/files/live/sites/tech/files/shared/tech/tech3344.pdf" > "itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-5-202311-I!!PDF-E.pdf" > > There should be some set of test files available, but I didn't > succeed to download it. > > SoX already has a "loudness" feature but it does not seem to be the > one defined by "EBU R 128" & "ITU-R BS.1770". It also has "stat" and > "stats" features, with findings not including values used by > "EBU R 128" & "ITU-R BS.1770" > > Suggestion: add evalutaion of those 4 values > * true peak > * max Momentary loudness (400 ms) > * max Short term loudness (3s) > * Integrated loudness (whole file) > and make them available in a suitable way ("-stat" or "-stats" or a new > command). > > Indeed I pefer having those values reported, over performing some > "normalization" directly. Having those values I can perform the task > either with SoX or other program (AudaCity, FFMpeg, ...). Plus > the "gain" feature of SoX is already overcomplicated. > > Maybe the options "norm" and "gain n" should be tagged as discouraged > in the manual, since they seem to perform the highly > unfortunate "peak normalization" (true or untrue?). > > I have found some "loudness" in SoX, AudaCity, and FFMpeg. Unfortunately > SoX seems to use a different loudness than "EBU R 128" & "ITU-R BS.1770". > AudaCity apparently can normalize correctly, but not report any findings, > plus it's bloated and GUI-only. FFMpeg mentions "EBU R 128" but seems > to do something strange, or different from what AudaCity does at least. > > > > _______________________________________________ > SoX-devel mailing list > SoX-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sox-devel > _______________________________________________ SoX-devel mailing list SoX-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-devel
