[LAU] placement.

Jörn Nettingsmeier nettings at folkwang-hochschule.de
Tue Jan 20 18:16:53 EST 2009

alex stone wrote:
> A question here gentlemen.
> With an WXYZ setup, what do those represent? Left/Right/Front/Rear?
> So any signal in would be a composite of position based on the strength
> of gain between 2 or more points?

are you familiar with M/S stereo miking? if not, get a figure of eight
and play with it. it's great to control the stereo width of a recording
during mixdown. once you've got a feel of the concept (matrixing a fig8
and a mono signal), add two more fig8s for up/down and front/back, and
there you go: first-order ambisonics.

in practise, soundfield mikes work differently because you can't squeeze
four capsules into the same point, but after some wizardry, the
microphone's output (called a-format) is converted into WXYZ b-format,
which is exactly m/s extended to 3d: a mono component W, a left/right
difference signal X, and front/back and up/down difference signals Y and Z.



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