On Mon, Jul 18, 2011 at 12:56 PM, Erik de Castro Lopo wrote: > David Adler wrote: > >> On Mon, Jul 18, 2011 at 12:13 PM, Renato wrote: >> > On Mon, 18 Jul 2011 11:53:47 +0200 >> ... >> > isn't it useless going way above 24 bits, since that's what in the end >> > the DAC (sound card) will use? as far as I can remember, delta-sigma >> > DACs don't go over 24 bit, do they? >> > >> More than 24 bit for DAC/ADC is useless, going above 24 bit for >> internal processing is not. The latter ensures that rounding errors >> that may be introduced by multiple math operations disappear when bit >> depth is finally reduced again to 24 before entering the DAC. > > Do not confuse DAC/ADC bit width with bit widths used during DSP > calculations. The two are basically orthogonal. How did I confuse them? >> The magnitude of rounding errors depends on the type and number of >> operations done. I don't know the limits, but for what Fons calls >> "normal audio engineering practise" (see his posting above), 32 bit is >> enough. > > For audio data paths this is true. For the intermediate results > during complicated calculations (eg filters and reverbs) double > precision makes things easier and is basically available for free. Oui, I stand corrected. best, d _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
