On Thu, 25 Jul 2013 16:14:20 -0400 Martin Cracauer <cracauer@xxxxxxxx> wrote: > Fons Adriaensen wrote on Thu, Jul 25, 2013 at 07:40:53PM +0000: > > On Thu, Jul 25, 2013 at 02:21:50PM -0400, Martin Cracauer wrote: > > > > > Does anybody know why wav files that do not have clipping would clip > > > when encoding them with lame? > > > > Because the peak sample value says nothing about the real > > level. Take a square wave with peak values +/-1. It is the > > sum of a number of sine waves, with frequencies 1,3,5,7,... > > times the frequency of the square wave. The first one has > > a peak value of about +/-1.27, that is +2 dB. So any encoding > > that looks at the spectrum (and mp3 does) will see a level > > that is +2 dB. > > Ah. Makes sense. Thanks so much! > > Is there a rule of thumb how many db less I should give music to avoid > this? What would be the value for pink noise starting at 40 Hz? I always finalise a wav file in Audacity with the peak level at -1dB. Seems to work for me :) -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
