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Re: [fluid-dev] Dither

From: Zenkov Mihail
Subject: Re: [fluid-dev] Dither
Date: Wed, 15 Nov 2006 03:23:18 +0200
User-agent: Opera Mail/9.02 (Linux)

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?


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.


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