Re: Manually mixing audio on iOS
Re: Manually mixing audio on iOS
- Subject: Re: Manually mixing audio on iOS
- From: Brian Willoughby <email@hidden>
- Date: Mon, 02 May 2011 12:29:03 -0700
On May 2, 2011, at 12:06, Jan wrote:
Am 02.05.2011 um 18:22 schrieb Kyle Sluder:
On Mon, May 2, 2011 at 3:59 AM, Jan <email@hidden> wrote:
I’m looking into manually mixing two stereo audio channels on iOS
because I have some needs that go beyond what the
MultiChannelMixer is capable of. As a first step I wanted to
replicate the mixing behavior of the iOS MultiChannelMixer Audio
Unit.
Search the list archives; there was an epic mixing thread a while
back, and I believe this was covered. Either way, it had some very
useful information about arbitrary mixing in general.
Thanks, I did come across the following equation which looks like
it would solve quite some problems:
Z = A + B - A·B
This equation does not do what the author claims. The A*B component
creates serious frequency modulation distortion. It will mix in new
frequencies that do not exist in either A or B. Unless you desire FM
distortion, I recommend that you forget you ever saw that function.
Is there any knowledge or ideas about what Apple does internally in
the multi channel mixer though? It has worked very well for me in
the past.
Apple uses industry standard techniques. There is nothing special in
there besides being thoroughly optimized for OSX and iOS hardware.
The 3D mixer is potentially very advanced, mostly because there is
more than one way to accomplish the generally desired goal, but I
cannot recall whether iOS offers the 3D mixer anyway.
Brian Willoughby
Sound Consulting
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