The Logic Off Topic list

Thinking about it more I just want to make a possible correction.



> From: "Pamela or/and Lars" <pollen@...>
>
>
> Arvid,
>
> My understanding was that the relative bit rate would decrease as tracks
are
> added together, if they are not output at a higher bit rate.  For example
if
> you mixed 2 matching sine waves, each at 16 bit and zero db, the resultant
> amplitude and dynamic range would exceed the ability of the 16 bits to
> represent it accurately.  So when they are output at 16 bits instead of
> having a sine wave with double the amplitude (and dynamic range)

I don't think the dynamic range would double because of the amount of energy
to double the db's I think is in the order of 10 times.  So although the
dynamic range would be higher it would not be double.  I think.

you have
> one with an identical amplitude to the first 2 sine waves.  So therefore
the
> relative dynamic range and bit depth was decreased during mixing to 16
bits.
> This is the same whether it is output as a file or to a D/A.  This is a
> reason why intenal processing of 32 bits is superior;  it allows the
dynamic
> range to be greater and more accurate during computation.  So when
multiple
> audio tracks are mixed they have a much lower increase in amplitude than 2
> identical sine waves but it still  adds up and thus the output needs to be
> reduced when going from the internal (and usually greater) bit depth to
the
> output bit depth.
>
> Now for a disclaimer.  I do not know how accurate my interpretation of the
> situation is.  I could be totally wrong here....
>
> Lars H
>
>
> > From: "Arvid Solvang" <arvid@...>
> >
> > >>Arvid Solvang wrote:
> > >>
> > >> If you have two stereo audio-files, both 16 bit - 44,1khz, and
> digitally
> > >>mix them together you still only get a stereo audiofile 16 bit -
> 44,1khz.
> > >>
> > >> Is there then a theoretical degration of the sound quality?
> > >
> > >From: Bobo Mark <mark4@...>
> > >If u don't any processing like EQ,compression.  It should no degration.
> >
> > But wouldn't one track that has all these bits have higher resolution
than
> > two tracks having the same amount of bits?
> >
> > PS. I know that there are no audible differents I'm just not sure how
this
> > work theoreticly.
> >
> > --
> > Arvid Solvang
> > http://www.viagram.no/privat/arvid/
> > ICQ: 13008461
> >
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