[Gary Eickmeier]

KH wrote:
On 4/29/2013 4:56 AM, Gary Eickmeier wrote:


Once again, you put it where you wanted to hear it *from*, and your
ears and HRTF allow you to localize the sounds. You think this an
epiphany? Seriously? That, of course has zero to do with where it
was in the performance.


I will leave the spatial reverberance part for another post,

Well yes of course, because your model breaks down completely at this
point. You can choose where the left channel is placed, but where do
you *place* the reverberant information? You don't know where it was,
it had no unique location such that you can place a speaker with
'geometric accuracy', and you can't separate the reverberant from the
direct in the signals you bounce around. so you just bounce it all
around everywhere - you have no other options.

Keith

Keith is getting close to some understanding here. He sees that we are
reconstructing the stereo images within our room, synthesizing where left
and right are, and using the recording to play onto that model the sounds
that we want to take on this perspective. I haven't yet convinced him that
this is legitimate, that it is "OKAY" to display the recorded sound in
another room like this, or that the ambience can possibly be separated from
the direct by means of time delay. But at least he is beginning to see the
system as a reconstruction in his room rather than a head-related
system.that is supposed to contain all directional information for your
ears.

And no, Keith, listening on headphones would not be stereophonic. Remember
the system definitions. Stereophonic is the above described field-type
system in front of you in your playback room. In fact, this is a great
illustration of the "problem" that Dick Pierce and Keith are both talking
about with stereo. They say that the two signals just don't have enough
information in them to completely reconstruct where all of the sounds came
from in the live situation, so stereo is a flawed system that may never have
complete realism. Thinking that you can play it on headphones proves them
correct in their complaint. All you get is this In Head Localization because
your ears just cannot tell which of Pierce's many possible planes that set
of left to right sounds could have come from.

Right?

So Eickmeier comes along and says right, but that is not how the system
works, and explains the difference between regarding the recording as "ear
signals" and realizing that it is a field-type system intended for playback
on speakers in another room from that which was recorded.

My big contribution is (if we can get over the first hurdle, the field-type
system difference) that to do it right (or rather even righter) we must
study the problem aa a total acoustical situation, rather than just sound
coming from two direct speakers. The acoustical model of live sound can be
studied for its spatial nature and those qualities incorporated in the
playback model to a great extent, if you can see you way clear to looking at
it from that perspective.

And so the people of Eick land lived happily ever after recording and
reproducing direct, early reflected, and reverberant sound and displaying it
as such in their listening rooms, using their new speakers as Image Model
Projectors rather than direct radiators.

Gad I love the ending. If we can ever make our way through the first
chapter.

Gary Eickmeier