new audio methods and devices -- fact or fiction?

Have a good idea for a new product for SFE or Olimex? Let us know!

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corvette123
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new audio methods and devices -- fact or fiction?

Post by corvette123 » Sat Sep 26, 2009 9:29 am

everyones heard about these... some are fact and some may be fiction.

post your comments here!!!! post what you know about and have personally tried / heard.


1. audio spotlight from www.holosonics.com (version soon to be installed in cars for personal zone audio systems?)

2. HSS similiar to above from american tech corp (cali and texas)

3. LRAD military and police force weopon... this one is all over the news... has anyone experience it?

4. FICTION?? "the acoustic heteorodyne" to make sound appear in mid air. there are references to this one on the web, but can anyone shed more light on it???

5. SIGGRAPH 08 - ultrasound phased array that creates a force in air to "push" paper.... fact or fiction?? theres a video on youtube!!!


its a great time to be alive and an engineer.

sometimes new tech blows us away.

i personally am not good at EM waves and know nothing of acoustics!!

so post what you know about the above!! and chime in.

ill add more links later on.

:lol: :lol: :lol: :lol:
Last edited by corvette123 on Sat Sep 26, 2009 9:38 am, edited 1 time in total.
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corvette123
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Post by corvette123 » Sat Sep 26, 2009 9:31 am

btw.

you guys all know i have served in the military (and several years in Iraq).... i do not hold any security clearances..

but i have personally witnessed things similiar to #1, #4 and #5 above. (unfortunately not on the right side of things.....)

:lol: :lol: :lol:

so post what you know :) and we all can get a head start on whats coming up.
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RonnyM
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Post by RonnyM » Sun Sep 27, 2009 6:35 am

I was asked to look into the technology in #1 for the reverse reason.Being able to isolate a conversation in a crowded, noisy room. It does work as advertised. It's like creating a virtual duct for keeping the sound focused. The down side is that the farther away the target is, the more ultrasonic power you need to reach it. Even if the pressure can't be heard, it can be sensed at greater power levels.
Ron

corvette123
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Post by corvette123 » Sun Sep 27, 2009 8:33 am

hmm never thought of that...

yah #1 is pretty cool.

i hang around the haunt forums around halloween time, and it seems some people ARE using that for haunted houses :)

although the cost is prohibitive, and turns some of them away....
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corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:20 am

here is a conecpt car with "zone audio"..... says its based on audio spotlight


http://www.pickuptrucks.com/html/storie ... rive3.html
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corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:22 am

good article about LRAD, and other such techs being installed on UAV's for SOCOM.

this article quotes the LRAD going upto 1400 meters!!! thats crazy!!! and its focused sound.



http://www.wired.com/dangerroom/2009/08 ... nd-system/
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corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:24 am

this is the youtube video of #5 above...

phased array ultrasound creating a force on paper..

anywhoo..

heres the video

supposedly this was at siggraph 08

http://www.youtube.com/watch?v=hSf2-jm0SsQ


another example

http://www.liveleak.com/view?i=a1e_1249948793



ive also read that ultrasound will be used for targeted inside body drug delivery, by using the force generated by it to push fluids.

found tons of patents pending on that and other applications.
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corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:29 am

this is american technology corps website...

makers of the LRAD and HSS sound systems... (among other things...)

think they moved to cali?? they were in austin texas before... (which is where my ex wife lives coincidently.......)



http://www.atcsd.com/site/
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corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:40 am

heres one of the patents filed by ATC for "acoustical heterodyne" where you can basically make sound appear at a point in space from 2 ultrasonic waves....

http://www.freepatentsonline.com/5889870.html


you can also see their other patents... there are many!!!

theyve been busy little bees.

:lol: :lol:
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krich
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Post by krich » Sun Sep 27, 2009 7:00 pm

I bet this acoustical heterodyne is based on the beat frequency created when two waves combine. Easy concept in one dimension, but I still can't get my head wrapped around the idea in 3D. Always suspected it was just a matter of time...

corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:56 pm

LOL

you guys are full of puns.
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corvette123
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Post by corvette123 » Sun Sep 27, 2009 10:57 pm

one of these days ill try some of these things out and order a couple.
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corvette123
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Post by corvette123 » Tue Sep 29, 2009 7:21 pm

hmmm welcome to the forum!

:wink: :wink:
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denial
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Post by denial » Tue Sep 29, 2009 11:15 pm

I've experienced #4 some years ago in university.
IIRC they borrowed a device from Sennheiser's research division for the show.

corvette123
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Post by corvette123 » Wed Sep 30, 2009 7:31 am

ahh Sennheiser! forgot about that company...

yah they do noise cancellation and such.... really good with acoustics...
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