| Author |
Message |
eric bazan
Guest
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 Posted:
Tue Nov 23, 2004 2:05 am Post subject:
Directed sonic weapons - new info |
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(...)
Deafening silence. Well, I knew this would be a hard sell.
Let me take one more stab at this, then I'll f*ck off.
Below is a very interesting link I've uploaded to my site.
Keep in mind this is from 2000. It talks about new breakthroughs
by an MIT student (F. Joseph Pompei ) regarding creating,
focusing, and controlling ultrasound:
http://www.fractalfreak.com/harass/AudioLight.html
They talk about new transducers, which, while only a foot in
diameter, can produce a focused ultrsonic beam with a spread
of about 3 degrees, and range of 100 meters:
"
In order to obtain such narrow directivity from a traditional
loudspeaker system, one would need a loudspeaker array fifty
meters across!
"
And:
"
The directivity, or narrowness, of an acoustic wave generated
by a circular transducer is proportional to the ratio of the
diameter of the transducer to the wavelength of the sound. So
a transducer much larger than the wavelength of the sound
creates a very narrow beam.
"
"
Audible sound contains wavelengths reaching lengths of several
feet, so a reasonably sized loudspeaker will always produce a
very wide, non-directional source at lower frequencies. The
Audio Spotlight, in contrast, outputs short, millimeter sized
ultrasonic waves, which form a very narrow beam even in a
small transducer, which in turn generates audible sound. The
nature of the nonlinear transformation also essentially
eliminates sidelobes in the resulting beam, and maintains
relatively uniform directivity across the entire audible
frequency range.
"
I'll try to be more specific.
Could these ultrasonic beams of sound be focused through commonly
used builing materials, perhaps just a floor or a wall, without
losing much coherence? (especially if a computer tailored the signal?)
I'm just talking about a brief second or two burst, because I
assume the power needed would be high.
What would be the effects, to the body, of being hit by one
of these ultrasonic waves? How would it feel? Keep in mind
these beams can be modulated anyway desired.
Apparently, using interference, or beats, two or more of these
beams can be focused to an area of space. Infrasound, and audible
sound, can be created at the point in space where they interfere. This
apparently can already be done.
So already it would be possible to create rumbles or vibrations
by focusing these ultrasonic beams.
Assuming they could be targeted through a house, most of the
effects I speculated would be possible.
I'm talking about a short burst type weapon. Just enough to
deliver a tap, poke or jolt to the body. Enough to wake someone
up. This needn't take much energy. I see many possibilites using
this scheme.
Am I way off base? Opinions?
-Eric B
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Cyrus
Guest
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| Posted:
Tue Nov 23, 2004 10:08 am Post subject:
Re: Directed sonic weapons - new info |
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In article <ca17eb03.0411221538.53b39889@posting.google.com>,
boo@fractalfreak.com (eric bazan) wrote:
| Quote: | (...)
Deafening silence. Well, I knew this would be a hard sell.
Let me take one more stab at this, then I'll f*ck off.
Below is a very interesting link I've uploaded to my site.
Keep in mind this is from 2000. It talks about new breakthroughs
by an MIT student (F. Joseph Pompei ) regarding creating,
focusing, and controlling ultrasound:
http://www.fractalfreak.com/harass/AudioLight.html
They talk about new transducers, which, while only a foot in
diameter, can produce a focused ultrsonic beam with a spread
of about 3 degrees, and range of 100 meters:
"
In order to obtain such narrow directivity from a traditional
loudspeaker system, one would need a loudspeaker array fifty
meters across!
"
And:
"
The directivity, or narrowness, of an acoustic wave generated
by a circular transducer is proportional to the ratio of the
diameter of the transducer to the wavelength of the sound. So
a transducer much larger than the wavelength of the sound
creates a very narrow beam.
"
"
Audible sound contains wavelengths reaching lengths of several
feet, so a reasonably sized loudspeaker will always produce a
very wide, non-directional source at lower frequencies. The
Audio Spotlight, in contrast, outputs short, millimeter sized
ultrasonic waves, which form a very narrow beam even in a
small transducer, which in turn generates audible sound. The
nature of the nonlinear transformation also essentially
eliminates sidelobes in the resulting beam, and maintains
relatively uniform directivity across the entire audible
frequency range.
"
I'll try to be more specific.
Could these ultrasonic beams of sound be focused through commonly
used builing materials, perhaps just a floor or a wall, without
losing much coherence? (especially if a computer tailored the signal?)
I'm just talking about a brief second or two burst, because I
assume the power needed would be high.
What would be the effects, to the body, of being hit by one
of these ultrasonic waves? How would it feel? Keep in mind
these beams can be modulated anyway desired.
Apparently, using interference, or beats, two or more of these
beams can be focused to an area of space. Infrasound, and audible
sound, can be created at the point in space where they interfere. This
apparently can already be done.
So already it would be possible to create rumbles or vibrations
by focusing these ultrasonic beams.
Assuming they could be targeted through a house, most of the
effects I speculated would be possible.
I'm talking about a short burst type weapon. Just enough to
deliver a tap, poke or jolt to the body. Enough to wake someone
up. This needn't take much energy. I see many possibilites using
this scheme.
Am I way off base? Opinions?
-Eric B
|
Perhaps you yourself would better understand things if you picked up a
book that deals with the subjects of human ears, sound, air and
electricity.
I am by no means an expert or an MIT graduate. But reading further into
the link on your site only points to basically a directed 'full range'
speaker for public address systems or for background music in a shopping
mall etc.
Usually, in order to shake things or disturb people/animals you need
lower frequencies. In the link you provided, the "Audio Spotlight"
'extends down to a few hundred Hertz' which is about the mid to lower
midrange frequencies of human hearing. It also states that it can reach
upwards beyond the range of human hearing.. which is basically sending
out radio waves. There are more frequencies traveling through the air at
any given time than you'll ever know.
Humans can feel lower frequencies (1hz-50hz) (broad generalization for
those in the know.). Humans can hear midrange frequencies to the lower
khz region (100hz-20khz~) (another broad generalization.). Anything
above that (megahertz-gigahertz range) is in the operation range of ham
radio, cell phones, cordless phones etc.
Lower frequencies can travel through objects, walls, buildings but
usually are very omnidirectional. Higher frequencies that are audible to
humans don't travel all that well through anything. Play your stereo,
walk into another room and close the door. You hear more bass than the
higher frequencies. Some higher frequencies that are audible to humans
bounce off of objects.. the link you provided mentions that as well. For
sound to seem like its coming from another source.
Another thing to mention is loudness.. as measured in db. The link you
provided mentions this device going to about 90db. I could be wrong but
i remember the OSHA regulations state that 115db is dangerous for
workers to be around constantly. Which IMO isn't very loud at all.. but
can be when listened to for long periods of time.
I didn't go entirely through your site about the things keeping you
awake at night. My first ideas are the building settling strucuturally,
neighbors playing bassheavy music elsewhere in the building(because
buildings aren't built with noise transmission taken into account)and
rattling things around you. Or it could simply be tinnitus.. the ringing
in your ears when the noise floor around you gets obscenely low. In
other words, don't listen to music so loud anymore. There is no cure for
tinnitus and it only gets worse with age.
hth,
--
Cyrus
*coughcasaucedoprodigynetcough* |
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Jay Kadis
Guest
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| Posted:
Tue Nov 23, 2004 6:08 pm Post subject:
Re: Directed sonic weapons - new info |
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In article <ca17eb03.0411221538.53b39889@posting.google.com>,
boo@fractalfreak.com (eric bazan) wrote:
[snip]
| Quote: |
Am I way off base? Opinions?
-Eric B
|
Have you been checked for sleep problems? There are known neurological
syndromes that result in sleep disturbances not unlike what you are describing.
I would think that might be a more likely cause than ultrasonic interference
from outside. Sleep clinics are available in many areas of the country.
-Jay
--
x------- Jay Kadis ------- x---- Jay's Attic Studio ------x
x Lecturer, Audio Engineer x Dexter Records x
x CCRMA, Stanford University x http://www.offbeats.com/ x
x---------- http://ccrma.stanford.edu/~jay/ ------------x |
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eric bazan
Guest
|
| Posted:
Wed Nov 24, 2004 10:07 pm Post subject:
Re: Directed sonic weapons - new info |
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Cyrus <invalid@i.like.spam> wrote in message news:<invalid-B3F553.22434122112004@newsclstr01.news.prodigy.com>...
| Quote: | In article <ca17eb03.0411221538.53b39889@posting.google.com>,
boo@fractalfreak.com (eric bazan) wrote:
(...)
(...)
Lower frequencies can travel through objects, walls, buildings but
usually are very omnidirectional. Higher frequencies that are audible to
humans don't travel all that well through anything. Play your stereo,
walk into another room and close the door. You hear more bass than the
higher frequencies. Some higher frequencies that are audible to humans
bounce off of objects.. the link you provided mentions that as well. For
sound to seem like its coming from another source.
(...) |
Sounds like what I'd be looking for is something with the penetrating
power of infrasound, but the directionality of ultrasound.
I agree, I just can't see how ultrasonic beams could be directed
through solids without losing nearly all their coherence, or even
simply being reflected.
I don't know if the 'loudness' is necessarily a factor with ultrasound,
as the vibrations are far above humane hearing.
Anyway, thanks for the response.
-Eric B |
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Matt Giwer
Guest
|
| Posted:
Sat Nov 27, 2004 12:17 pm Post subject:
Re: Directed sonic weapons - new info |
|
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eric bazan wrote:
| Quote: | (...)
Deafening silence. Well, I knew this would be a hard sell.
Let me take one more stab at this, then I'll f*ck off.
Below is a very interesting link I've uploaded to my site.
Keep in mind this is from 2000. It talks about new breakthroughs
by an MIT student (F. Joseph Pompei ) regarding creating,
focusing, and controlling ultrasound:
http://www.fractalfreak.com/harass/AudioLight.html
They talk about new transducers, which, while only a foot in
diameter, can produce a focused ultrsonic beam with a spread
of about 3 degrees, and range of 100 meters:
"
In order to obtain such narrow directivity from a traditional
loudspeaker system, one would need a loudspeaker array fifty
meters across!
"
And:
"
The directivity, or narrowness, of an acoustic wave generated
by a circular transducer is proportional to the ratio of the
diameter of the transducer to the wavelength of the sound. So
a transducer much larger than the wavelength of the sound
creates a very narrow beam.
"
"
Audible sound contains wavelengths reaching lengths of several
feet, so a reasonably sized loudspeaker will always produce a
very wide, non-directional source at lower frequencies. The
Audio Spotlight, in contrast, outputs short, millimeter sized
ultrasonic waves, which form a very narrow beam even in a
small transducer, which in turn generates audible sound. The
nature of the nonlinear transformation also essentially
eliminates sidelobes in the resulting beam, and maintains
relatively uniform directivity across the entire audible
frequency range.
"
I'll try to be more specific.
Could these ultrasonic beams of sound be focused through commonly
used builing materials, perhaps just a floor or a wall, without
losing much coherence? (especially if a computer tailored the signal?)
I'm just talking about a brief second or two burst, because I
assume the power needed would be high.
|
They are not focused. They simply are in phase and thus have the
equivalent of antenna gain.
The higher the frequency the less transmission through solid material
because of the mismatch in acoustic impedance. And it doubles if it
has to pass through it and come out the other side. For a normal wall
there are panels on both sides and maybe insulation in between. That
is a lot of losses. And insulation at those frequencies makes a great
sound absorber. Going through glass is a better bet.
| Quote: | What would be the effects, to the body, of being hit by one
of these ultrasonic waves? How would it feel? Keep in mind
these beams can be modulated anyway desired.
Apparently, using interference, or beats, two or more of these
beams can be focused to an area of space. Infrasound, and audible
sound, can be created at the point in space where they interfere. This
apparently can already be done.
So already it would be possible to create rumbles or vibrations
by focusing these ultrasonic beams.
|
Not in any practical sense. The conversion efficiency of the
production of the lower frequency is on the order of 1%. The sound
source has a conversion efficiency turning electricity into sound and
the rest into heat, maybe 30-40%. At some point you cause significant
heating in the ultrasonic source. You are also talking something that
gets larger as power and range increase.
| Quote: | Assuming they could be targeted through a house, most of the
effects I speculated would be possible.
I'm talking about a short burst type weapon. Just enough to
deliver a tap, poke or jolt to the body. Enough to wake someone
up. This needn't take much energy. I see many possibilites using
this scheme.
|
No taps, pokes or jolts. It is otherwise just like any other sound.
It doesn't matter how the sound is generated it is still just sound.
| Quote: | Am I way off base? Opinions?
|
You need to look for some other explanation for your experience. I
don't see this getting you any place.
And frankly there are probably less than a hundred people in the
world who are familiar enough with this phenomenon to talk about it.
Of those maybe a dozen can design equipment using it.
--
Israel is the only nation in the world which brags about having
assasination squads. And Israel brags about the assasinations.
-- The Iron Webmaster, 3299 |
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Guest
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| Posted:
Sun Jan 16, 2005 1:59 pm Post subject:
Re: Directed sonic weapons - some patents |
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Well, apparently some of the sonic weapons I speculated
on are possible. Check out the patents below, which
employ various means (including interfering waves) to
create directed sonic pulses and 'effects'.
You can do a patent search on these patents at the USPTO
search page: (type in the patent # for more info)
http://patft.uspto.gov/netahtml/srchnum.htm
3,612,211 (** unable to lookup)
method of produciung locally ocurring infrasound
4,349,898
sonic lens - ('phased array') - to focus high energy, low frequency
sonic signal at arbitrary point
5,864,517
pulsed combustion acoustic wave generator
5,973,999
acoustic canon
(...)
3,951,134
!! Apparatus and method for remotely monitoring and altering
brain waves
I got these links off this page:
http://www.us-government-torture.com/techie.html
-Eric B |
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