Re: [fluid-dev] Dither

[Zenkov Mihail]

> 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