Highly Directional Audio Paper?

[Rich Grise, Plainclothes Hippie]

Well Rich, I did think about rephrasing the subject line, but looks
like the idea got through.

Oopps! Sorry I didn't provide a smiley to indicate that my saddy was
intended to be humourous. ;-)

[then again, sometimes I think I'm the only one who gets my humour -
should I take a poll? >:-> ]

["YES! SHUT THE F**K UP!!!!!!" I hear you cry. Oh, well )-; ] ;-)

Cheers!
Rich

 

[amdx]

Well Rich, I did think about rephrasing the subject line, but looks
like the idea got through.

Oopps! Sorry I didn't provide a smiley to indicate that my saddy was
intended to be humourous. ;-)

[then again, sometimes I think I'm the only one who gets my humour -
should I take a poll? >:-> ]

["YES! SHUT THE F**K UP!!!!!!" I hear you cry. Oh, well )-; ] ;-)

Cheers!
Rich

Rich, I'm fine with you, I get your humour, sometimes I even enjoy it
Mike
Here's a smiley face to make up for the one you think you missed

 

[Fred Bloggs]

In that case, he could not have invented the basic technology
(production of audible sound from the nonlinear mixing of two
ultrasonic sound sources), which was used to produce audible narration
and music apparently in mid air with no visible source in the General
Electric display at the 1964 worlds fair.

You can get the basic physics and math for this old technique in
'Fundamentals of Physical Acoustics' by Blackstock if you are
interested. It is only one of many interesting effects produced by
the inherently nonlinear characteristics of the propogation of finite
amplitude sound through a gas. Sound propogation through liquids is
also nonlinear, so the same thing could be done underwater.

Glen

That looks like a good one. Thanks for the tip, Glen.

 

[Rich Grise, Plainclothes Hippie]

On Wed, 25 Jul 2007 07:52:38 -0500, amdx wrote:

I'd like to see this paper, anyone now how to locate it?

Dr. Joseph Pompei wins Technology Review's Award for Audio Spotlight
Directional Sound Technology

Oh, hell - I thought you were talking about a piece of paper which,
when you apply a signal, emits sound. )-;

Well Rich, I did think about rephrasing the subject line, but looks
like the idea got through.

Oopps! Sorry I didn't provide a smiley to indicate that my saddy was
intended to be humourous. ;-)

[then again, sometimes I think I'm the only one who gets my humour -
should I take a poll? >:-> ]

["YES! SHUT THE F**K UP!!!!!!" I hear you cry. Oh, well )-; ] ;-)

Rich, I'm fine with you, I get your humour, sometimes I even enjoy it
Mike
Here's a smiley face to make up for the one you think you missed

Hey, one is infinitely more than zero. ;-D

Thanks!
Rich