Re: Newbie questions
Re: Newbie questions
- Subject: Re: Newbie questions
- From: Brian Willoughby <email@hidden>
- Date: Mon, 6 Apr 2009 00:32:20 -0700
On Apr 5, 2009, at 23:53, tahome izwah wrote:
2009/4/6 Brian Willoughby <email@hidden>:
BTW. Tahome's suggestion for a pseudo-stereo "edge" mix is not
compatible
with industry standards for stereo. It won't survive a mono
mixdown because
that would result in silence. This "edges of the stereo field" is
actually
just inverting the one resulting channel and putting it in the
other. Many
really cheezy guitar pedals do this, and it's fine for cheap
stereo because
it will fool the human brain, but it's not really recommended to
use such a
signal because combining channels destroys the audio (not just the
vocal,
but all of the audio). Might be fine for iPhone, though, but if
your users
attach any monophonic output device, such as particular BlueTooth
speakers,
earpieces, or headphones, then it won't work.
"Won't work" isn't exactly how I would put it. He wants the stereo
field sans the center channel in order to suppress the vocals (this is
how I read his original question). This is exactly what you get, no
matter if you mix it down to mono or not.
I do not know the details of all output devices that are compatible
with the iPhone, but if there is one - BlueTooth or wired - which
mixes left and right to product mono, then your math "won't work"
because it will produce silence on those devices. Your math will
work on most discrete stereo devices, unless the distance between the
speakers allows acoustic mixing of the signals, then it could get all
phasey.
For a mono signal this would indeed result in silence but this isn't
what he is doing.
I was ignoring mono input. I'm talking about a mono output device.
i.e. Stereo to "edge stereo without vocal" to mono output device -
that also would not work.
Also, there is no such thing as a fully mono compatible stereo center
channel suppression, no matter how you approach the problem.
Sure there is. If you use the algorithm I suggested, then you can
suppress the center channel, so long as you are happy with the result
being mono. If a "stereo" signal that's actually mono (same signal
on both channels) is mixed down to mono, then it will sound exactly
the same. Thus, mono-output stereo center channel suppression is
fully mono compatible.
Brian Willoughby
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