Hi, To answer both questions:
Normalizing to 50% before you start to edit a file doesn't make much
sense to me. If for instance the peak level is - 10 dB and the
average value is -20 dB, and you are gonna normalize to 50 %, you
will lower the level that much, that you are gonna loose enough bits
to code the signal.
If however you make sure that each file has about 10 or 12 dB
headroom before editing, that would make sense to me ; now you can
safely do edits and know that you have about 80 dB signal and about
10 dB headroom.
With some filter settings the total level of the sound is lowered (or
raised) compared to the situation before the edit. In that case it
could be that your filtered part has a different level compared to
the unedit parts before and after your edit.
[assuming that you selected a small part of a file]
This is VERY audible ; thus unwanted. In that case the pre and post
normalizing acts like a sort of auto-gain feature.
[also at the same time, the edits are done with max bitwidth thus
Same goes for compressors ; the actually limit the loud peaks, so the
peaks are lowered, by choosing the auto-gain feature you make sure
that the peak levels remain the same ; the RMS will be changed.
--- In Klas Strandberg
> And what about programs which normalize automatically? Even twice?
> At my WaveLab, there are squares to mark to enable or
> before" and "normalize after". If I don't remove the marks, the
> will not only filter, but also normalize the file both before and
> operation. Automatically.
> WaveLab is made by Steinberg, which has (as far as I know) an
> How come they propose such a thing? One may very well think that
> is a "safe" operation?
> >> I have an opinion on that: never normalize. Never. No need for
> >> the last stage of CD mastering, overall levels might be raised
> >> loudest sounds are close to max or limited close to max, but
> >> as far as you want to go. In intermediate steps, you need
> >> for processing.
> >What about normalizing to 50%. I do this on all my recordings
before I start
> >to edit?. Am I making a mistake? I use CoolEdit.
> >John V. Moore Nature Recordings
> Telinga Microphones, Botarbo,
> S-748 96 Tobo, Sweden.
> Phone & fax int + 295 310 01
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