The Logic Off Topic list

Gilles Ruppert wrote:
> Sorry to tell you Sascha: wrong, see my other post. if you don't believe
me
> check out Ken C Pohlmann, Principles of Digital Audio. You might not hear
> the mistake, but it comes up & you will see it when you analyse it.

Sorry, but I DID anylyse it.
Or do you think that digital silence is something which just happens by
accident?
It only (!) happens when inverting two signals if the two sources are 100%
identical.

> More
> steps & you will start to hear the mistake (I speak about A LOT MORE
> PROCESSES).  It becomes eventually audible in Fade outs or low volume
> passages.

I repeated my steps 5 times, still there was digital silence.

> OK. Imagine this: you have a 3 bit soundfile, which gives you 8 steps. The
> volume of your sine tone is "7". You reduce the volume by -6 dB
(normalizing
> does nothing else than changing volume), though half as loud.

Ok, there's your mistake.
Normalizing NEVER (!) lowers any level. All it does is to bring up the level
to 0dB and that's it.

> 7/2 = 3.5, but
> how will it be showed, as 3.5 does not exist? It is either 3 or 4 in the
> digital domain & voila our rounding error & quantization noise.

Sure, but we are NOT reducing (= dividing) any levels when normalizing.
You have to do your calculations the other way round:
7x2 = 14
14/2 = 7
=> no rounding errors possible.


> Well with 16
> bit & 24 bit, the resulting noise is of course of much lower volume,
because
> the steps are far smaller. Of course you are also working with a complex
> wavefile & the result will be different for every cycle & at very low
> volume, but believe me, it has a reason why Mastering Engineers do not
> normalize!

There *might* be some reasons mastering engineers don't normalize, I don't
know anything about that, all I know is that normalizing doesn't change the
sound at all, this is perfectly proveable, see my last posts example, it
works under any circumstance.

Regards,
Sascha