25 Jul
2013
25 Jul
'13
10:14 p.m.
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:
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?
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. If you really want to normalise on the peak level, use
a
lower one. If you want all your samples to have the same
loudness, use RMS instead of peak, or a real loudness
measurement such as provided by ebumeter.
Is there a way to hook up ebumeter to just an audio file or a stream
not associated with real time? It seems to come in a jack package only.
Thanks again
Martin
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Martin Cracauer <cracauer(a)cons.org> http://www.cons.org/cracauer/