Emu XL-7 & MP-7 User's Group

Ok well, the real problem isn't noise so much as that the overall sound quality
suffers because you have less dynamic range recorded in the bits.  So if you
normalize it it will work, and you may get quantization noize, however you won't
get the same amount of overall information on a weak spdif signal since you
effectively cut out more and more bits to hold frequency information. In a true
analog signal it extra frequency content even at low volumes.  The best way is
just to fix everything in the mix so you can get it as hot as possible for the
spdif.  The reason (and I am just guessing on this) the overall volume is lower
for the SPDIF on the XL7 is that you have such a wide range of dynamics,
especially when using filters so you have to make sure there is enough headroom
on the digital out for peaks like this.  On the analog converters they simply
overdrive or distort but even they can be made to digitally clip now and then.

Andre

-----Original Message-----
From: Kris Musard [mailto:kmusard@...]
Sent: Tuesday, April 22, 2003 12:49 PM
To: xl7@yahoogroups.com
Subject: Re: [xl7] recording from SPDIF output?


What does quantisation noise sound like?  How can I
recognize this?

--- Aaron Eppolito <synthesis77@...> wrote:
> --- kmusard <kmusard@...> wrote:
> > I know that it is good recording practice to get
> the hottest signal
> > from the source without clipping to get a good
> singal to noise
> > ratio.  Is this required for SPDIF?  I am thinking
> that since the
> > connection is digital I should be able to record
> from the MP-7 then
> > normalize the recordings on my PC without boosting
> noise.
>
> Well, you're correct in that you won't be boosting
> analog white noise
> (as there is none in digital) but you will be
> boosting quantisation
> noise.  However, as S/PIDF is at a much higher bit
> depth than most
> media these days, you should be fine.  Normalizing
> the S/PDIF will
> *always* yield quieter results than recording the
> analog mains because
> the same digital signal that feeds the S/PDIF feeds
> the D/A converters
> (don't quote me on that, but I'm pretty sure).
> Therefore, all you're
> doing by recording the analogs very hot is
> performing analog
> normalization instead of diginal normalization, with
> unneeded D/A and
> A/D stages!
>
> -Aaron
>
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