[LAU] Batch normalising wav files

[Fabio]

Em Fri, 24 Dec 2010 17:07:48 +0000
Q <lists at quirq.ukfsn.org> escreveu:

> Out of interest, how high can intersample peaks get above the highest 
> peaks in a file?

here mix to max. -1,0 dBFS is recommended:

> 1. Leave lots of headroom in your mix: This is the obvious solution,
> and it requires no special processing. As long as you keep the peak
> levels in your mix below 0dBFS, the DAC will never encounter the
> situation described above. The consensus I’ve found is that real-world
> inter sample peaks never exceed 1dB, so keep your levels below -1.0
> dBFS and you’ll be fine.

from: http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/

> 2. Use a mastering tool designed to prevent these peaks: iZotope’s
> Ozone is one such tool. The loudness maximizer has a one-click option
> to prevent inter-sample clipping.
> 
> 3. Use a metering tool that highlights the peaks: SSL recently
> released the X-ISM Plug-In which adds an inter-sample peak meter to
> any VST-capable DAW.

wondering if any of those tools in 2. or 3. are available for linux!?

here it is shown that intersample peaks can eventualy/teoriticly exceed
10db!!!:

> If you want to see something really bad on the oversampled meter -
> try a sequence of maximum and minimum values that goes like this:
> "1010101101010" - notice that the alternating 1's and 0's suddenly
> change direction in the middle. The results depends on the filter
> being used in the reconstruction, with the intersample peak easily
> exceeding 10dB!

from:
http://www.gearslutz.com/board/tips-techniques/334385-intersample-peaks.html