On Tuesday 04 April 2006 11:50, [EMAIL PROTECTED] wrote: > > On Tuesday 04 April 2006 09:36, Erik Hofman wrote: > >> Timothy Miller wrote: > >> > On 4/3/06, Justin Findlay <[EMAIL PROTECTED]> wrote: > >> >> I'd say more than 24, perhaps 32 bits per channel. > >> > > >> > Ok. I thought about saying 32, but I didn't want to look absurd. :) > >> > >> Internally you would have to use 32-bit floating point values, > >> everything else will be obsolete rather soon. 24-bit D/A conversion > >> would be nice and 32-bit D/A converters would be great. > >> Or forget about an internal D/A converter all together and use digital > >> output only. > > > > There are problems associated with 32bit floating point signal processing > > in > > audio especially if you are trying to do DSP on the card. The easiest > > example > > of this is low freqency/high Q filtering which needs simultaneous use of > > large and small values, something floating point is not good at. A double > > precision 24bit fixed point DSP would be much better. You get a dynamic > > range > > of 288dB plus more predictable results from your algorithm. > > What is "double précision 24 bits DSP" ? > > 32 bits flotting point unit use 24 bits mantissa. The precision is the > same as a 24 bits fixed integer unit. So i don't understand you're point. > As I understand it you basically pair 2 x 24bit DSPs to give yourself a 48bit fixed point DSP.
The benefits are explained here. http://www.jamminpower.com/PDF/48-bit%20Audio.htm I know it would be more expensive but considering that the ear is very sensitive to "pumping" of audio I think it would be worth it if you were going to be doing filter on the card and selling it as a pro-audio card. Regards, Paul Mullen. > Nicolas Boulay > > _______________________________________________ > Open-graphics mailing list > [email protected] > http://lists.duskglow.com/mailman/listinfo/open-graphics > List service provided by Duskglow Consulting, LLC (www.duskglow.com) _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
