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HYPERSONIC SOUND "speakers" are "LIKE" headphones.

Dec 4, 2005 at 10:54 PM Post #2 of 32
Funny how the industry is. Headphone amplification companies are trying to make headphones sound more like speakers with crossfeeds, and speaker companies are trying to get speakers to sound like headphones...
rolleyes.gif


There was an older post around here, that Polk Audio use to make speakers that cancelled out the other side's signal so that it would sound like headphones.
 
Dec 5, 2005 at 6:37 PM Post #3 of 32
I saw something like this in a much less advanced form a few years back with something about the size of a bin-lid. Looks like a fantastic technology, but not sure how the quality would actually compare. I suppose that'd come with time though.....

The guys on the segment I saw before seemed to largely be using their prototype to play noises of china smashing to dinner-ladies with trolleys and scaring the proverbial pants off them.
 
Dec 5, 2005 at 10:25 PM Post #5 of 32
Quote:

Originally Posted by firefox360
Funny how the industry is. Headphone amplification companies are trying to make headphones sound more like speakers with crossfeeds, and speaker companies are trying to get speakers to sound like headphones...
rolleyes.gif


There was an older post around here, that Polk Audio use to make speakers that cancelled out the other side's signal so that it would sound like headphones.


LIkewise solid state electronics are trying to sound like tube electronics and tube electronics are trying to sound like solid state electronics. I wonder what all this "cross breeding" is converging on?
 
Dec 5, 2005 at 10:38 PM Post #6 of 32
Quote:

Originally Posted by ZOKROX
Hypersonic Sound "speakers" are "like" headphones:

http://www.usatoday.com/tech/news/te...5-19-hss_x.htm



Interesting... IMHO it just looks like a highly directional electrostatic or piezo-electric diaphragm. Note they demo-d it with "Ice cubes clinking on glass". Looks like they picked highly directional frequencies, and sounds that are near the eardrum resonant frequency... No doubt to enhance the results.

Now... if they could accomplish the same thing across the spectrum... THAT would practically defy physics and wave propagation theories.

Impressive IMHO~!!

Garrett
 
Dec 5, 2005 at 11:03 PM Post #7 of 32
Quote:

Originally Posted by kramer5150
Interesting... IMHO it just looks like a highly directional electrostatic or piezo-electric diaphragm. Note they demo-d it with "Ice cubes clinking on glass". Looks like they picked highly directional frequencies, and sounds that are near the eardrum resonant frequency... No doubt to enhance the results.

Now... if they could accomplish the same thing across the spectrum... THAT would practically defy physics and wave propagation theories.

Impressive IMHO~!!

Garrett


Maybe it's closer to "microwave" technology (only a guess). I'm guessing this because the same inventor has invented "stuff" for the military which uses this technology.

This article uses the words "Piezoelectric transducer":

http://www.ideas21.co.uk/248

Wikipedia article on Hypersonic Sound:

http://en.wikipedia.org/wiki/HyperSonic_Sound

I don't know for sure, but I read articles about a new weapon that the military uses at a distance to make the "enemy" "feel" like their blood is "boiling" and give up - some kind of "beam" thing. I'm beginning to wonder if this new weapon isn't a weaponized "Hypersonic Sound" speaker.

Does anybody know for sure if there is a connection between the "Hypersonic Sound" speaker and these new "beam" weapons they're talking about.

Beam weapon articles:

http://science.howstuffworks.com/pain-beam.htm

http://www.willthomas.net/Convergenc...aving_Iraq.htm
 
Dec 5, 2005 at 11:10 PM Post #8 of 32
Quote:

Originally Posted by ZOKROX
LIkewise solid state electronics is trying to sound like tube electronics
and tube electronics is trying to sound like solid state electronics. I wonder
what all this "cross breeding" is converging on?



Hopefully.....perfect sounding music
 
Dec 5, 2005 at 11:21 PM Post #10 of 32
Quote:

Originally Posted by RedLeader
Absolutely not. Without getting into technical details, they're 2 different technologies.


Hmmmm. Here's an article on the "Hypersonic Sound" as a WEAPON!

Norris, the inventor, demonstrates a WEAPONIZED Hypersonic Speaker
on a NEW YORK TIMES reporter; the reporter said his head felt like it was going to explode.

http://www.raven1.net/hssweapon.htm



Microwave hearing pathway:

http://66.102.7.104/search?q=cache:m...ve+sound&hl=en
 
Dec 5, 2005 at 11:22 PM Post #12 of 32
It's different than just picking highly directional frequencies and using a tight beam. What they're doing is sending out two ultrasonic waves, one at a fixed frequency, and another variable frequency one near the first one's frequency. When the waves hit a surface (your head, a wall, or a table) the two waves undergo constructive/destructive interference. What you end up hearing is the beat frequency (the destructive interference one). The constructive interference wave will be well out of your hearing range, like the original two waves were.

Very neat. This can't be done well using standard methods, i.e. high power speakers with waveguides, as the (relatively) long wavelengths we can hear cannot be beamed well.

Likely, it sounds nothing like speakers or headphones. Not surprising since it works nothing like speakers or headphones. It probably won't be anywhere near hifi for a while either. If mapping out HRTF for headphones tough, this would be extremely difficult, since with headphones, you're dealing with a driver unit a fixed distance from the ear. With this, the equivalent driver unit would be the layer of air right next to your ear. Still, for low-fi uses, this thing is like magic.
 
Dec 5, 2005 at 11:33 PM Post #13 of 32
Re: Pain beam:

The "pain beam" is much simpler. It's just a giant microwave transmitter with a focusing dish. It transmits one frequency that heats the water on the surface of your skin to give you equivalent of an instant, rather painful, sunburn.

Re: "hypersonic" sound as a weapon

The advantages of ultrasonic freqencies in use as a weapon is that you can get away with using relatively small transmitting elements to transmit a long distance, high energy, focused beam. In audible frequencies, the transmitting elements and power requirements would be huge as the beam can't be focused well.

The problem is that ultrasonic frequencies are inaudible, but using the whole beat frequency thing I mentioned above, you can beam some focused painful audible noise at long distances.
 
Dec 5, 2005 at 11:37 PM Post #14 of 32
Quote:

Originally Posted by marvin
Re: Pain beam:

The "pain beam" is much simpler. It's just a giant microwave transmitter with a focusing dish. It transmits one frequency that heats the water on the surface of your skin to give you equivalent of an instant, rather painful, sunburn.

Re: "hypersonic" sound as a weapon

The advantages of ultrasonic freqencies in use as a weapon is that you can get away with using relatively small transmitting elements to transmit a long distance, high energy, focused beam. In audible frequencies, the transmitting elements and power requirements would be huge as the beam can't be focused well.

The problem is that ultrasonic frequencies are inaudible, but using the whole beat frequency thing I mentioned above, you can beam some focused painful audible noise at long distances.


Thank you very much marvin!
 
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