Hi all
I hope to design a device that can make a small signal like a sin wave sound to travel like laser beam which will not spread out in small distance.

I don't want it to spread for 3 meters
I saw a a device on the TV that is used in cinemas to talk to a person sitting surrounded by many people so nobody can listen you except the the targeted person.

 

The long wavelength of sound is working against your goal.
Look up acoustic phased array.

 

Hi all
I hope to design a device that can make a small signal like a sin wave sound to travel like laser beam which will not spread out in small distance.

I don't want it to spread for 3 meters
I saw a a device on the TV that is used in cinemas to talk to a person sitting surrounded by many people so nobody can listen you except the the targeted person.

Use parabolic reflectors.
https://en.wikipedia.org/wiki/Parabolic_reflector

 

A video example of parabolic mirror for sound...
https://www.exploratorium.edu/video/archimedes-doug-hollis

 

It is easy to beam higher than you can hear ultrasonics.

Ultrasonic devices are used to beam a translation to a person in a conference and people nearby do not hear it.
They make an object at a museum "talk".
Look in Google for Hypersonic Sound and Audio Spotlight.

 

Hello there Here are some references about
Sound Beam Technology.
I hope it helps.
J. Gartner. “Wired News: Point-‘n’-Shoot Sound Makes Waves”. Internet: http://www.wired.com/news/technology/0,1282,50483,00.html, Feb. 21, 2002 [Mar. 12, 2003].
.
.

American Technology Corporation. “Technology Licensing – Hypersonic Sound”. Internet: http://www.atcsd.com/tl_hss.html, [Mar. 12, 2003].
S.K. Kirschner. “Popular Science | Audio’s Next Big Thing”. Internet: http://www.popsci.com/popsci/science/article/0,12543,351353,00.html, [Mar. 12, 2003].
Reno, Jame & Croal, N’Gai. “Hearing is believing”. Internet: http://www.woodynorris.com/Articles/Newsweek3.htm, Aug 5, 2002 [Mar. 12, 2003].

EDIT: My apologies, Deleted links that go to nowhere…

 

Hello there Here are some references about
Sound Beam Technology.
I hope it helps.
J. Gartner. “Wired News: Point-‘n’-Shoot Sound Makes Waves”. Internet: http://www.wired.com/news/technology/0,1282,50483,00.html, Feb. 21, 2002 [Mar. 12, 2003].
D. Schneider. In the audio spotlight. Scientific American, vol. 279, pp. 40-41, Oct. 1998.
S. Bains. “Industry Focus. Audio Spotlight Exploits Nonlinearity in Air”. Internet: http://www.spie.org/web/oer/october/oct00/indfocus.html, Oct. 2000 [Mar. 12, 2003].
B.C. Fenton. “Hypersonic Sound: Sound from Thin Air”. Internet: http://popularmechanics.com/technology/audio/1997/6/Hypersonic_Sound/index.html, [Mar. 12, 2003].
American Technology Corporation. “Technology Licensing – Hypersonic Sound”. Internet: http://www.atcsd.com/tl_hss.html, [Mar. 12, 2003].
S.K. Kirschner. “Popular Science | Audio’s Next Big Thing”. Internet: http://www.popsci.com/popsci/science/article/0,12543,351353,00.html, [Mar. 12, 2003].
Reno, Jame & Croal, N’Gai. “Hearing is believing”. Internet: http://www.woodynorris.com/Articles/Newsweek3.htm, Aug 5, 2002 [Mar. 12, 2003].
D. Sparrow. “Hypersonic Sound”. Internet: http://www.popsci.com/popsci/bown/article/0,16106,388134,00.html, [Mar. 12, 2003].
J. Muller. (July 16, 2002). “Sonic Bullets to be Acoustic Weapons of the Future”. Internet: http://abcnews.go.com/sections/wnt/DailyNews/sonic_bullet020716.html, Jul. 16, 2002 [Mar. 12, 2003].

https://abcnews.go.com/sections/wnt/DailyNews/sonic_bullet020716.html
OOPS! PAGE UNAVAILABLE.

Just like the nonexistent technology.

 

https://abcnews.go.com/sections/wnt/DailyNews/sonic_bullet020716.html
OOPS! PAGE UNAVAILABLE.

Just like the nonexistent technology.

Is non-existed technology Flash Player? Many news websites are still transferring content from Flash to other formats and the stories get lost.
Here is the converted link...
https://abcnews.go.com/WNT/story?id=130225&page=1

 

My apologies to you @nsaspook Sir.
Along with anyone else I may have inconvenienced It can be very frustrating to click on a link that goes nowhere ,would make me want to yell as well.
As for the non-existent technology. All technology was non-existent . It is a prerequisite that we make it up as we go along...
https://illumin.usc.edu/directional-audio/

Directional Audio
May 5, 2003

These are just a few of the virtually limitless number of potential applications. Within the next 3 to 5 years sound beam technology should begin to find its way into many different areas of our everyday lives. We should also begin to see many new applications in a number of different areas. Just imagine the way that advertisers might use this type of technology. Don’t be surprised the next time you go to the supermarket and the donuts are pleading with you to buy them and eat them. Don’t worry, you aren’t crazy. The voices in your head are real.

Still waiting...

 

Still waiting...

Maybe development is complete and it's classified.
This could be the explanation for Havana Syndrome... and all other maladies with curious symptoms that the patient can't quite verbalize beyond "icky" and similar words.

 

Maybe development is complete and it's classified.
This could be the explanation for Havana Syndrome... and all other maladies with curious symptoms that the patient can't quite verbalize beyond "icky" and similar words.

Another Military Conspiracy of secret technology ... Please ...
Havana Syndrome. HA HA HA Didn't you get the CIA memo. Sonic weapons are off the table now, the current bogyman weapon uses microwaves.

https://www.mcgill.ca/oss/article/h...vana-syndrome-or-case-eliminating-implausible

We’ve blamed witches, demons, telephones, and giraffes for the aches and pains of everyday life. The Havana syndrome saga may yet be another episode of this blame game. I really feel for the people affected, especially since their personal health is being scrutinized and speculated about under the microscope of media coverage. But I don’t think we can rule out the snowball effect of nonspecific symptoms in a high-stress situation with an active rumour mill. These mass suggestion events have punctuated humanity’s long history. Microwave weapons? Not so much.

 

The ultrasonic audio beaming products I mentioned are new and are sold and installed today, not 19 years ago.
Hypersound Pro Audio and Holosonics Audio Spotlight are two products and maybe there are more.

 

The ultrasonic audio beaming products I mentioned are new and are sold and installed today, not 19 years ago.
Hypersound Pro Audio and Holosonics Audio Spotlight are two products and maybe there are more.

I personally prefer Holosonics for my application. They just announced a newer version.

 

There are some really cool audio tricks you can do with ultrasonic's vs audio band because the ultrasonic acoustic "L-waves" and "T-waves" wavelengths are comparable with RF transverse wavelengths.

https://www.lshompole.com/creepy-tech/s1e2-holosonics

 

Change the propagation media from air to a solid rod as long as needed.
Or,

 

Oh yes,The electromagnetic spectrum, boundless physics.
What I like about this non-existing technology & non-linearity, ultrasonic beaming.Is the possibility to create a structure with a negative refractive index, since this property is not found in any non-synthetic material. Frequency Selective Surface (FSS), Artificial Magnetic Conductors (AMC) and High Impedance Surfaces (HIS).The HIS or AMC, is a artificial metallic.
But what I am really excited about is the high-frequency battlefield communication potential & lenses for high-gain antennas & improving ultrasonic sensors. But mostly now I can talk back to those voices in my head & know where they're coming from.

From another thread about impossible things.
https://forum.allaboutcircuits.com/...he-worlds-electirc-devices.83015/#post-591618
https://forum.allaboutcircuits.com/...the-worlds-electirc-devices.83015/post-592765

 

I was correct in making you my nemesis & you are the coolest person I never met!
I'm tired of designing using High Frequency Structure Simulator (HFSS) tools
This is a good read!
Yuehe Ge, Karu P. Esselle, and Yang Hao, “Design of Low- Profile High Gain EBG Resonator Antennas Using Genetic Algorithm,” IEEE Antennas and Wireless Propagation Letter, vol. 6, 2007.

I've given up being a Nemesis.

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