[KH]

On 4/23/2013 3:18 PM, Audio_Empire wrote:
In article ,
"Gary Eickmeier" wrote:

Donald White wrote:
On 4/22/2013 7:34 AM, Gary Eickmeier wrote:
KH wrote:

3-D pattern, 2-D signal.

While I have read this news group for some time and Keith can surely
answer for himself, I don't think the 3-Ds he is referring to are
spacial dimensions. The three are time, amplitude and direction. Of
these the microphone captures only time and amplitude which are are
the contents of the 2-D signal.

Don


Well, that's different! I'm sure Keith can answer for himself on this one,
but I would say that the 3D means the same as the Greek derivation of
"stereophonic," or "solid," three dimensional as opposed to flat, two
dimensional, width only.

Gary Eickmeier

That's correct. Three dimensional sound has width, depth and height.


Actually no, I wasn't referring to solid geometry. As Donald states,
I'm talking about time, amplitude, and direction. Hence all the
discussion surrounding vector information. A 2-D signal does not
contain directional information that is not just required, but is an
intrinsic property of a vector. Acoustic signals comprise multitudinous
vectors. It's the vector summation, filtered and transformed via the
HRTF that allows identification, aurally, of three dimensions. It's the
angular component that is excised during transduction.

Perhaps this is some of the confusion. I thought vectors would be well
understood in the discussion.

Keith