18 Jul
2011
18 Jul
'11
9:38 a.m.
Moshe Werner wrote:
Dale Powell to me
That 48 bit thing could hark back to Protools when it used the Motorola
56k DSP chips:
https://secure.wikimedia.org/wikipedia/en/wiki/Motorola_56000
which are fixed point DPS chips.
According to this:
https://secure.wikimedia.org/wikipedia/en/wiki/Protools
Protools uses 48 bit fixed point arithmetic (possibly doubled 24 bit
registers of the Moto 56k or possibly custom hardware).
64bits is double (comes from 32bit computer
architecture, so double uses
two words per value.)
Single generally uses 24bit values and 8bits of exponent.
Double uses 53bit values with 11bits of exponent.
Oh I see. So whats this Pro tools 48bit mixer talk about that goes on in the
industry? Why would it be better or more precise than the Ardour
mixer (which i prefer
over Protools).
If it is 48 bit fixed point I would think that it is inferior to
Ardour which almost certain uses double floating point which has
a 53 bit significand.
Erik
--
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Erik de Castro Lopo
http://www.mega-nerd.com/