Jeremy Nicoll - ml sox users <jn.ml.sxu.88@xxxxxxxxxxxxxxxxxxxx> writes: > On 2018-07-07 21:47, Måns Rullgård wrote: >> Jeremy Nicoll - ml sox users <jn.ml.sxu.88@xxxxxxxxxxxxxxxxxxxx> writes: > >>> Yes. So does that mean that the OP should use something like the >>> 'stat' effect to find out the peak RMS level of the audio file, >>> then work out how much gain or attenuation is needed, then use >>> a 'gain' effect with that calculated value? > >> No, he should just use the gain effect. It adjusts both RMS and peak >> values by the same amount because that is what happens when you multiply >> each sample by a fixed amount, which is what the gain effect does. > > Yes, I understand that gain is gain, but he has to decide how much > gain to apply. If he's previously done that in terms of a pre-gain > peak level, but now wants to bring RMS levels to a certain point, > he surely has to find out what the file's RMS levels are first > then decide how much to modify it by? The question posed was how to obtain an RMS gain of -12 dB. The answer is that RMS gain is equal to peak gain, so "gain -12" will perform the desired function. If the question were how much gain to apply in order to obtain a specific RMS level, then of course the initial value would have to be known. -- Måns Rullgård ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Sox-users mailing list Sox-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/sox-users
