Mind Stretchers
On Wed Jun 13 23:47:10 2012 Sebastian Kaliszewski wrote:
If someone came with good theory allowing us convicing audio scene recreation
without sacrificing other audio aspects some standard like -- place mikes always
12ft above flooor, pointed such as such, etc.
Hi Sebastian -
Welcome to the dogfight!
I was just trying to relate a subject that has been near and dear to
my heart for a long time, and it has turned into a Hatfields and
McCoys pitched battle for some reason. I think audio people have a lot
of dug in ideas that are hard to change. There is also a lot of
miscommunication here, sometimes because we don't try very hard to
understand the other's point. In any case I didn't intend it to turn
out this way - just wanted to run a few ideas up the flagpole in a
friendly manner and use the simple to complex method to do that. Start
with a few things that we would all agree on, then ratchet it up to
some things that I have discovered.
In order to do your convincing audio scene recreation we first study
What Can We Hear, by means of describing all of the MAJOR categories,
or aspects, of sound that are audible and relate them to the repro
problem. We got down to the spatial characteristics as being the main
stumbling block, and the new paradigm that I attempted to relate as a
way of looking at the problem is the well-known technique of image
modeling. It is just a more visual way of studying the direct and
early reflected parts of the sound fields. If you take a look at the
image model of reproduced sound from speakers, you can compare that to
the live model and see the differences. There are obvious physical
differences in the "shape" of these fields that we can make a little
better with what I call The Big Three - speaker positioning, radiation
pattern, and room acoustics. This is possible because the two rooms,
although different sizes, are geometrically similar.
Maybe I should quit while I am behind - and you can read thru the
thread - but that is basically the theory that you are asking for.
Specifically, it says that the reproduction will sound closest to the
live sound when the image model of the reproduction sound field is as
close to that of the live field as possible. I refer to all audible
characteristics of both fields, which is why I started with the What
Can We Hear thread. To me, this theory is a tautology - an
indisputable fact that is so obvious that it requires no proof. To
others, it is a challenge to long held beliefs.
Gary Eickmeier
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