Re: [fluid-dev] Dither

[Josh Green]

Thanks for the links, I have a better understanding of dithering now :)
FluidSynth really needs a new release, I'll make it a priority.  Best
regards,
        Josh Green


On Wed, 2006-11-15 at 03:23 +0200, Zenkov Mihail wrote:
> > Thank you for your patch submission.  I haven't yet given it a try.
> > Looking at the changes you made though, I would guess it attempts to
> > make the rounding of the audio conversion less audible?
> 
> Yes.
> 
> > I noticed there
> > is a buffer which is allocated of size 48000, which I assume is related
> > to the sampling rate.  Do you think this will also work fine with 44100
> > for example?
> 
> rand_table not buffer, this contain precalculated dither value (we can
> calculate this in realtime but it cost some speed). Size of rand_table
> should be big enough to prevent audible low freq modulation.
> 44100 / 48000 = 0,91875 Hz
> 48000 / 48000 = 1 Hz
> 96000 / 48000 = 2 Hz
> 192000 / 48000 = 4 Hz
> 
> > I'm no DSP expert, so if someone has any insight/pointers to information
> > on this topic I'd be interested.
> 
> http://en.wikipedia.org/wiki/Dither
> http://audio.rightmark.org/lukin/dither/dither.htm
> 
> 
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