Re: Mixers and clipping
Re: Mixers and clipping
- Subject: Re: Mixers and clipping
- From: James McCartney <email@hidden>
- Date: Wed, 14 Sep 2005 11:50:13 -0700
The mixer doesn't clip. It shouldn't because you may have other
things after the mixer in an audio chain that may bring the level
down, so you don't want to clip prematurely. So it is the output
device driver that mixes your audio with other clients and then clips
it.
Applying some compression and limiting is one way to deal with a
situation where you are trying to manage volume of many channels
whose material you might not know beforehand.
On Sep 14, 2005, at 9:43 AM, Jens Alfke wrote:
How does the standard stereo-mixer audio unit handle clipping when
the sum of the inputs exceeds ±1.0? I'm assuming that it probably
just pegs the output level, although in the little bit of testing
I've done, the results don't seem to sound as harshly distorted as
I'd expect from that. Maybe I just didn't push it hard enough :)
If I did want to set up some kind of nicer "soft clipping", what
would be the best way to do it? My first guess would be: Lower the
volume on all the mixer inputs by, say, 2db, then run the mixer
output through a PeakLimiter unit with a 2db pre-gain. Is that
reasonable? I really don't know anything about the PeakLimiter (I
haven't found any documentation on the standard audio units and
their behavior, other than brief notes in AudioUnitParameters.h.)
--Jens _______________________________________________
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