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: Tue, 03 May 2011 15:45:46 -0700
Yes, I agree, it must be confused.
Thanks to 'th' for suggesting that it might be related to radio,
because before that I was baffled as to how anyone could come up with
such a formula for audible frequency mixing. Then again, if you look
at this function from the point of view of radio heterodyning,
modulation, FM, IM, or frequency shifting, then there would be no use
for the "A + B" component. In other words, nobody would ever want
both the amplitude mix AND the frequency mix. That's just noise in
either case.
To be clear, if A is a constant frequency, then "A*B" can be used for
radio heterodyning to shift a base band signal up to a carrier
frequency, or down from a receiver frequency back to the base band.
But, if A and B are both audio signals then you get a horrible
distortion. Some folks like this sound, which is why FM is a popular
synthesis technique or effect.
"A+B" represents simple mixing, but the resulting amplitude of Z is
higher than either A or B in most cases, and thus runs the risk of
clipping. The bizarre (and totally useless) "A+B - A*B" formula was
touted as a solution to the clipping issue, but actually combines
frequency distortion with standard mixing.
Brian Willoughby
Sound Consulting
On May 3, 2011, at 14:05, Robert A. Abernathy wrote:
To me it looks like a unit confusion, a formula for amplitude mixed
with a formula for frequency, It's a mixer "corrected" with a ring
modulator.
On May 3, 2011, at 10:53 AM, tahome izwah wrote:
Could this formula have something to do with "mixing" (as in ham
radio) and complex numbers? Most people confuse these types of
mixing...
Just my 2 cents
--th
2011/5/2 Jan <email@hidden>:
Thanks, I did come across the following equation which looks like
it would solve quite some problems:
Z = A + B - A·B
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