23 Jul
2007
23 Jul
'07
2:16 p.m.
On Mon, 2007-07-23 at 14:16 +0200, Fons Adriaensen wrote:
On Sun, Jul 22, 2007 at 01:29:19PM -0400, Paul Davis
wrote:
Even for this (most simplistic) summing example, an error or noise floor
at -118.8 dB would still be like comparing the sound of a deafening
jet-engine close up, to that of some rustling leaves in the background
(which may or may not be missing in your soundscape ...) Hardly
noticeable.
I also wonder ... Suppose channels 1 - 4095 were an orchestra of
assorted, close miked vacuum cleaners and hair dryers, and channel 4096
was a sole bagpiper. Would you then be able to figure out wether he is
playing Auld Lang Syne or not?
:)
I would suspect the bagpipe to be lost. With that [4096] amount of
channels, we are approaching something compareable to that of a football
choir at a stadium, were one individual has no impact whatsoever on the
resulting sound.
2) there are some good theoretical arguments for
needing more than 32bit
floating point resolution for a mixer
I did a quick experiment.
N floating point signals, all of them Gaussian distributed, summed
both as single and double precision. If the difference between the
two sums is considered 'noise', the signal/noise ratios R in dB are:
N R
----------------
16 -142.9
32 -140.0
64 -136.7
128 -133.8
256 -130.7
512 -128.0
1024 -124.7
2048 -121.9
4096 -118.8