On 12/20/2010 07:29 PM, Paul Davis wrote: > 2010/12/20 Jörn Nettingsmeier <[email protected]>: > >>> there is a complication: loudness is no identical to maximum sample >>> value, but the relationship is good enough for government work, so to >>> speak. >> >> no, it's not. there is absolutely no meaningful relation whatsoever >> between perceived loudness and peak value. > > there is if they are all samples of the same instrument. > > that's why i said "good enough for government work" :)
ok, i took that as a general remark... but still: chances are multiple dynamic variants of the same instrument have the same peak value, if the maker used peak limiting to avoid s/n issues on very dynamic instruments (which is quite likely). and you will not be able to map multiple sounds to perceptually equal loudness levels. say you want to create a "drum map" for your keyboard: you will want the toms to be just as loud as snare and bass drum when you play them with "average" velocity. maybe the "replay gain" measurement features present in some audio players could be used for the job (perhaps some are even scriptable)? i'd expect them to have a very long time window though, so it's probably best to feed them 10-30 repetitions of the same sound for the measurement system to stabilize. _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
