eiret;226036 Wrote: > > cliveb;226016 Wrote: > > Presumably you are referring to the "digital volume control" section in > > the "computer audio playback setup guide", > > > > Here is the mathematic : EXAMPLE (decimal numbers are used for > > simplicity): > > When multipling 21 by 0.5 (equation: 21 * 0.5), the result is 10.5. > > The result (10.5) requires three digits to represent it, where as the > > two multiples (21 and 0.5) only had two digits. > > > > Se below on this side : > > http://extra.benchmarkmedia.com/wiki/index.php/Digital_volume_control> > > > So, in your example, the sound amplitude is represented as 21. > > But if you multiply 21 by 256 first (which is like what happens when > you upsample from 16 bits to 24 bits) the amplitude is now > represented by 5376. Divide 5376 by 2 and you get 2688 which is still > a whole number. > > That is why upsampling is done before the volume control is > applied...what would have been "16 bit fractions" are handled > properly. > Darren
-- darrenyeats SB3 with Inguz -> Sony DAS-703ES DAC -> Krell KAV-300i -> PMC AB-1 (home-made room treatments and supports) ------------------------------------------------------------------------ darrenyeats's Profile: http://forums.slimdevices.com/member.php?userid=10799 View this thread: http://forums.slimdevices.com/showthread.php?t=38233 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
