Subject: Re: [linux-audio-user] declipper
From: Paul Winkler (pw_lists_AT_slinkp.com)
Date: Thu May 27 2004 - 19:50:20 EEST
On Thu, May 27, 2004 at 08:54:54AM -0700, R Parker wrote:
>
> --- Paul Winkler <pw_lists_AT_slinkp.com> wrote:
> > On Thu, May 27, 2004 at 08:04:25AM -0700, R Parker
> > wrote:
> average level.
> > >
> > > If these spikes aren't clips, maybe I can
> > normalize
> > > and close the level gap between the spikes and the
> > > average signal. I'll try that but suspect it won't
> > do
> > > the job.
> >
> > Normalizing won't change the relative levels of the
> > spikes
> > and the average at all.
>
> Ah, yes of course you're right. Are there two types of
> normalization; A. adjusts everything relatively, B.
> moves the average?
Normalization is just simple amplification by a
constant factor. The factor is calculated so that the
highest peak in the normalized audio will be at some
user-determined target level (typically, the target defaults to
"maximum", e.g. 32767 for signed 16-bit audio... or sometimes
a dB or two below maximum, I guess to avoid clipping DACs).
So if you think about it, normalization is always
both A and B :-)
--Paul Winkler http://www.slinkp.com
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