[music-dsp] Tweakable filters of higher orders?

[gogins at pipeline.com]

NEVER render with integer precision. ALWAYS run EVERY step in the audio
rendering chain at MAXIMUM precision -- unless you are FORCED to lower
precision, for example to burn a CD master at the very end.

You WILL hear the difference -- not in all places in all music, but in some
places in some music.


Original Message:
-----------------
From: Pedro Pereira Hors pedrinho at internet.com.uy
Date: Thu, 30 Sep 2004 12:06:25 -0300
To: music-dsp at shoko.calarts.edu
Subject: RE: [music-dsp] Tweakable filters of higher orders?


Someone just made a question in the forums of a community of computer
musicians, and I thought maybe some of you DSP gurus might no the answer
(I've been in the list for some time, lately, and although I'm still
learning the basics of DSP). Here's the post with the question, made in the
forums at CTGMusic.com:

Atlantis wrote on 30 Sep. (12:51) :

Has anyone else noticed that when exporting audio from Reason (I'm using 24
bit, but I assume it happens with 16 bit as well), there's a -121.6 dB
noisefloor, regardless of the volume of the sound. So even if I export the
signal at a quiet volume, there's still this DC offset-like noise that gets
rendered as well when there's no sound playing. I thought turning the volume
of the sound up as high as it could go without causing clipping might mean a
better signal to noise ratio, but still the noise remains at -121.6 dB.

Actually I've noticed the same in Renoise's output when rendering with an
integer bit depth, and the same goes for Sk at le Tracker. But it's only when I
use floating point precision in Renoise (the only software I've come across
with floating point rendering so far) that it completely disappears. So I
guess it must be something to do with the limitations of rendering with
integer bit precision? Does anyone know why this happens? Or better yet, how
to avoid it?


     
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