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Natural Science Forum / Physics / Acoustics / June 2004



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New type of sound projection...Is it for real?

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Dennis - 09 May 2004 19:13 GMT
>Not as crazy as it sounds...
>
>New York Times
>March 23, 2003,
>Sunday MAGAZINE DESK
>By Marshall Sella (NYT)
>
> No one ever notices what's going on at a Radio Shack.
>Outside a lonely branch of the electronics store, on a
>government-issue San Diego day in a strip mall where
>no one is noticing much of anything, a bluff man with
>thinning, ginger hair and preternaturally white teeth
>is standing on the pavement, slowly waving a square
>metal plate toward people strolling in the distance.
>''Watch that lady over there,'' he says, unable to
>conceal his boyish pride for the gadget in his giant
>hand. ''This is really cool.'' Woody Norris aims the
>silvery plate at his quarry. A burly brunette 200 feet
>away stops dead in her tracks and peers around,
>befuddled. She has walked straight into the noise of a
>Brazilian rain forest -- then out again. Even in her
>shopping reverie, here among the haircutters and
>storefront tax-preparers and dubious Middle Eastern
>bistros, her senses inform her that she has just
>stepped through a discrete column of sound, a sharply
>demarcated beam of unexpected sound. ''Look at that,''
>Norris mutters, chuckling as the lady turns around.
>''She doesn't know what hit her.''
>
>[...]
>
>http://www.datafilter.com/mc/nyTimesHssInfoMar03.html
>
>******************************************************
>
>Perfect Sound from Thin Air
>New Scientist, Sept. 7, 1996.
>By Gary Eastwood
>
>A music system that apparently conjures sound out of
>thin air could replace conventional sound technology,
>say its developers.  The prototype system has no
>conventional speakers.  Instead it relies on
>ultrasonic waves to generate a "sonic hologram", or
>interference pattern, in midair.  As well as improved
>sound systems, the technology might also be modified
>for crows control applications.  The system could
>target particular individuals with powerful,
>low-frequency sound waves that temporarily disable
>them.
>
>[...]
>
>http://www.datafilter.com/mc/newScientistAcousticalHeterodyning.html
>
>******************************************************
>
>Non-lethal (or nonlethal) weapons is a term used to
>describe weapons which can incapacitate, subdue, or
>alter the behavior of people without killing them or
>resulting in permanent harm.  It is a misnomer,
>because the weapons can be lethal or crippling.  Much
>of the recent publicity involves such weapons as bean
>bag guns and giant nets, which make for good public
>relations without revealing the more secretive
>technology.  The real concern is electromagnetic and
>acoustic weapons (as well as chemical and biological
>agents), especially those that can be used covertly
>with "plausible denial."
>
>Here is the draft of a book, online, from the Naval
>Studies Board.  It is dated 2002 and titled An
>Assessment of Non-Lethal Weapons Science and
>Technology.
>
>Examples of psychological effects were identified in
>the preceding sections on specific health effects. 
>Much opportunity seems possible using systems that are
>explicitly designed to enhance communication, since
>information exchange is a principal medium of
>psychological effects.  Notable among these were the
>acoustic technologies that provide communication
>through vastly different means.
>
> The Pentagon (Marine Corps) announced in March, 2001,
>that it is working to produce a new "non-lethal" crowd
>control weapon.  The technique has been under secret
>development for ten years, according to press
>accounts.  It uses EM radiation at higher than
>microwave frequences and is claimed to produce pain
>without permanent injury.  Here is an article from the
>Air Force Times [*],which calls the weapon "perhaps
>the biggest breakthrough in weapons technology since
>the atomic bomb."  Here is a New York Times article,
>and here is an ABCNews article [*] describing what
>sounds like the same weapon. Presumably the human
>subjects mentioned in the news articles were all
>consensual, though that is not explicitly stated.
>
>The New York Times article mentions some human rights
>concerns about  whether the devices are truly safe. 
>They do not discuss any  potential problems resulting
>from the ability of a government to disrupt street
>demonstrations with a wide-field weapon.  They do not
>mention what a perfect torture implement a device
>which causes extreme pain but no direct physical
>damage would be.  Readers of these pages also know
>that, combined with surveillance feedback, a remote
>aversive stimulus generating device could be used to
>attempt to behaviorally condition a person -- even
>remotely from a distant location.
>
> Claims that such millimeter-wave weapons are safe are
>questioned in this UPI article from March 6, 2001,
>titled "Scientists dispute military 'raygun' claims."
>[*]
>
>Adey, a fellow of the American Academy of Arts and
>Sciences and a distinguished visiting professor of the
>Royal Society of Medicine, said Russian studies
>conducted some thirty years ago show that microwaves
>can effect white blood cells before the subject feels
>heat. "The question is whether this weapon could
>include a bundle of non-thermal effects that are not
>related to heating," he said.
>
> A Newsweek article from 1994, "Soon, 'Phasers on
>Stun'" describes the push for so-called non-lethal
>arms.
>
>...the list of exotic technologies that could be
>harnessed for nonlethal weapons is already large and
>growing. It includes lasers, microwaves, sound waves,
>strobe lights, electromagnetic pulses, microbes,
>chemicals, computer viruses -- even giant nets...
>...Sources tell Newsweek that the FBI consulted Moscow
>experts on the possible use of a Soviet technique for
>beaming subliminal messages to Koresh. The technique
>uses inaudible transmissions that could have convinced
>Koresh he was hearing the voice of God inside his
>head. The air force offered a top secret nonlethal
>system that, according to one source, "would have
>given [the FBI] the ability to make a surprise attack
>with a large number of agents." ...
>
> Here is a recent U.S. News article, by Douglas
>Pasternak, on the newest generation of weapons in
>development. It is from July 1997, and is titled "
>Wonder Weapons: The Pentagon's quest for nonlethal
>arms is amazing. But is it smart?" [*]
>
>By using very low frequency electromagnetic radiation
>-- the waves way below radio frequencies on the
>electromagnetic spectrum -- he [Eldon Byrd] found he
>could induce the brain to release behavior-regulating
>chemicals. "We could put animals into a stupor," he
>says by hitting them with these frequencies. "We got
>chick brains -- in vitro -- to dump 80 percent of the
>natural opioids in their brains,'"Byrd says. He even
>ran a small project that used magnetic fields to cause
>certain brain cells in rats to release histamine. In
>humans, this would cause instant flulike symptoms and
>produce nausea. "These fields were extremely weak.
>They were undetectable," says Byrd. "The effects were
>nonlethal and reversible. You could disable a person
>temporarily," Byrd hypothesizes. "It [would have been]
>like a stun gun."
>
>Byrd never tested any of his hardware in the field,
>and his program, scheduled for four years, apparently
>was closed down after two, he says. "The work was
>really outstanding," he grumbles. "We would have had a
>weapon in one year." Byrd says he was told his work
>would be unclassified, "unless it works." Because it
>worked, he suspects that the program "went black."
>Other scientists tell similar tales of research on
>electromagnetic radiation turning top secret once
>successful results were achieved. There are clues that
>such work is continuing. In 1995, the annual meeting
>of four-star U.S. Air Force generals -- called CORONA
>-- reviewed more than 1,000 potential projects. One
>was called "Put the Enemy to Sleep/Keep the Enemy From
>Sleeping." It called for exploring "acoustics,"
>"microwaves," and "brain-wave manipulation" to alter
>sleep patterns. It was one of only three projects
>approved for initial investigation.
>
> This is the text of a brochure giving the planned
>schedule of talks at the classified 1993 Non-Lethal
>Defense conference held at Johns Hopkins.  Among the
>speakers at the conference was Janet Reno.  Topics of
>the talks include voice synthesis, RF weapons, the use
>of ELF EM waves as nonlethal weapons, and acoustic
>technology.  Clearly, then, the FBI knows something
>about this technology.
>
> Here is a DoD Draft Non-Lethal Weapons Policy [*]
>dated July 21, 1994.  It is part of the MindNet
>collection archived at the MCF.
>
>The term "adversary" is used above in it broadest
>sense, including those who are not declared enemies
>but who are engaged in activities we wish to stop.
>This policy does not preclude legally authorized
>domestic use of non-lethal weapons by U.S. military
>forces in support of law enforcement.
>
> In February, 1998, the Joint Economic Committee of
>the U.S. Congress held hearings on Radio Frequency
>Weapons and Proliferation: Potential Impact on the
>Economy.  These hearings dealt with anti-materiel
>weapons rather than anti-personnel weapons, but the
>testimony presented to the committee contains good
>general information on portable RF generation
>technology, etc.
>
> This European Parliament Scientific and Technological
>Options Assessment Report is titled "The Physiological
>and Environmental Effects of Non-Ionising
>Electromagnetic Radiation."  It is from March, 2001,
>and discusses nonthermal electromagnetic bioeffects.
>
>...there are indications of non-thermal thresholds for
>biological effects of the order of a microwatt/cm2.
>
> This pair of articles about non-lethal weapons
>appears in The Bulletin of the Atomic Scientists,
>Sept/Oct, 1994.  The articles are "The 'Soft Kill'
>Fallacy" [*] by Steven Aftergood and "Oh yes...
>they're probably illegal" by Barbara Hatch Rosenberg.
>
>HyperSonic Sound (HSS) is an acoustic system capable
>of projecting sounds to a person or object, based on
>the heterodyning of a pair of ultrasonic beams.  Here
>are excerpts from a New York Times article from Mar.
>23, 2003 describing the system.  The subjective effect
>on a person is described as being like a sound inside
>the head. The newer versions can project a sphere of
>sound, not just a beam of sound. This technology is
>real, operative, and now in the open.
>
>Acoustical techniques in nonlethal weapons are
>described in this New Scientist article from Sept. 7,
>1996, "Perfect Sound from Thin Air."  The article is
>by Gary Eastwood and describes a California company's
>plans to market a sound projection device based on
>acoustical heterodyning.  (The company is American
>Technology Corporation.)
>
>The system may also have applications in crowd
>control.  Powerful, low-frequency sound can cause
>disorientation and nausea.  In the 1960s, the US tried
>unsuccessfully to use low-frequency sound from
>helicopters to disable enemy soldiers in the
>Vietnamese jungle.  But the sound sources needed were
>so intense that they almost shook the aircraft apart,
>and most of the sound was absorbed by those nearest to
>the loudspeakers.  According to Norris, acoustical
>heterodyning could pinpoint an individual up to 200 or
>300 metres away by positioning the interference zone
>correctly.
>
> HSV technologies is developing a non-lethal weapon
>that uses a pair of ultraviolet lasers [*] to ionize a
>path through the air to a human target.  This path
>then acts as a conductor, along which electrical
>impulses are sent which mimic "the neuro-electric
>impulses that control skeletal muscles."  They claim
>the external signals are imperceptible to the target
>except that they "tetanize muscle tissue."
>
> The book Electromagnetism and Life by Robert Becker
>and Andrew Marino is online at Marino's web site.
>
> These are excerpts from "Microwaves and Behavior," by
>Don Justesen, American Psychologist, Mar. 1975:
>
>Human beings can "hear" microwave energy. The averaged
>densities of energy necessary for perception of the
>hisses, clicks, and pops that seem to occur inside the
>head are quite small, at least an order of magnitude
>below the current permissible limit in the United
>States for continuous exposure to microwaves, which is
>10 mW/cm^2....
>
>To "hear" microwave energy, it must first be modulated
>so that it impinges upon the "listener" as a pulse or
>a series of pulses of high amplitude....
>
>Sharp and Grove ... found that appropriate modulation
>of microwave energy can result in direct "wireless"
>and "receiverless" communication of speech. They
>recorded by voice on tape each of the single-syllable
>words for digits between 1 and 10. The electrical
>sine-wave analogs of each word were then processed so
>that each time a sine wave crossed zero reference in
>the negative direction, a brief pulse of microwave
>energy was triggered.  By radiating themselves with
>these "voice-modulated" microwaves, Sharp and Grover
>were readily able to hear, identify, and distinguish
>among the 9 words. The sounds heard were not unlike
>those emitted by persons with artificial larynxes.
>Note that the published date is 1975. There is little
>doubt that improved modulation and microwave
>generation techniques have been developed in the
>meantime. This is a fairly sophisticated application
>of microwave harassment techniques. The same article
>notes that basic microwave heating can cause damage
>before sensations of heating are even noticed. 
>Microwave attacks by thermal loading can inflict brain
>damage and other physical damage.
>
>For more information, here is a summary and list of
>some microwave hearing articles on the web.
>
> The Air Force Research Laboratory has some reports
>online concerning the bioeffects of RF radiation,
>including the Radiofrequency Radiation Dosimetry
>Handbook.
>
> This report, by Julianne McKinney of the Association
>of National Security Alumni, was one of the first to
>openly describe microwave anti-personnel weapons and
>their use in harassment.  Here is a copy at the Pink
>Noise site, " Microwave Harassment and Mind-Control
>Experimentation." [*]
>
> In this report presented to the World Foundation for
>Natural Sciences on October 17, 1998 -- online at the
>Leading Edge site -- Nick Begich discusses non-lethal
>weapons systems.  He considers especially the
>political aspects of such systems being used by
>governments against their own people.
>
>A weapon which could intrude into the brain of an
>individual represents a gross invasion of their
>private life. The idea that these new systems could be
>created in the next several years should be cause for
>significant discussion and public debate. On July 21,
>1994, Dr. Christopher Lamb, Director of Policy
>Planning, issued a draft Department of Defense
>directive which would establish a policy for
>non-lethal weapons in the United States. The policy
>was intended to take effect January 1, 1995, and
>formally connected the military¹s non-lethal research
>to civilian law enforcement agencies. The government's
>plan to use pulsed electromagnetic and radio frequency
>systems as a nonlethal technology for domestic Justice
>Department use rings the alarm for some observers.
>Nevertheless, the plan for integrating these systems
>is moving forward. Coupling these uses with expanded
>military missions is even more disturbing. This
>combined mission raises additional constitutional
>questions for Americans regarding the power of the
>federal government to use military systems in domestic
>police actions. In interviews with members of the
>Defense Department the development of this policy was
>confirmed. In those February, 1995, discussions, it
>was discovered that these policies were internal to
>agencies and were not subject to any public review
>process. In its draft form, the policy gives highest
>priority to development of those technologies most
>likely to get dual use, i.e. law enforcement and
>military applications. According to this document,
>non-lethal weapons are to be used on the government's
>domestic "adversaries." The definition of "adversary"
>has been significantly enlarged in the policy: "The
>term 'adversary' is used above in its broadest sense,
>including those who are not declared enemies but who
>are engaged in activities we wish to stop. This policy
>does not preclude legally authorized domestic use of
>the nonlethal weapons by United States military forces
>in support of law enforcement." This allows use of the
>military in actions against the citizens of the
>country that they are supposed to protect.
>
> This article by Tom Jaski, "Radio Waves & Life," in
>Popular Electronics, Sept. 1960, details some of the
>history of research into the biological effects of
>radio-frequency electromagnetic radiation.  It
>describes research going back to the 1920s.  Jaski
>also replicated some of these early results, as the
>following somewhat lengthy excerpt describes:
>
>This brings to mind the work of a man who started
>publishing articles on this kind of subject more than
>35 years ago. An Italian university professor named
>Cazzamalli placed human subjects in a shielded room,
>subjected them to high-frequency radio waves, and
>claimed to be able to record a "beat" which, he
>received on a simple untuned receiver consisting of a
>galena crystal, a small capacitor, antenna and
>sensitive galvanometer. Cazzamalli's equipment, as
>well as it can be determined from his early articles,
>is shown in Fig. 1.
>
>[...]
>
>http://www.datafilter.com/mc/nonlethalWeapons.html
>
>******************************************************
>
>Colonelyu wrote:
>
>> http://members.aol.com/alanyu5/index.htm
>>
>> The method of secretly sending "vioces" into a
>> target's brain without others' knowledge.
>>
>> How can human "hear" (microwave) voice with brain
>> without using ears?

Signature

"Be suspicious of anybody who claims to know the truth."

--
"Be suspicious of anybody who claims to know the truth."

Tonyjeffs - 01 Jun 2004 19:23 GMT
Ultrasonic beat frequencies!
I remember reading about this 10 or 15 years ago, so it aint a new idea.

Send out two ultrasonic beams of sound, identical to start with, but one is
fixed frequency, whereas for the other one the frequency is modulated
according to the sound you are transmitting. When the two ultrasonic
sounds meet, the interference pattern beween the two constitutes an audible
sound.

Yesterday I watched a magician on tv willing a total stranger on the street
to stop and look around. The magician was behind an office window 100 yards
away. Maybe he had one of these things hidden!

Tony
Ron Capik - 02 Jun 2004 16:38 GMT
> Ultrasonic beat frequencies!
> I remember reading about this 10 or 15 years ago, so it aint a new idea.
[quoted text clipped - 10 lines]
>
> Tony

It's not science fiction.  Check out:
< http://www.atcsd.com/pdf/HSSWHTPAPERRevE.pdf >
for an overview of the technology.

Ron Capik
NJ Pinelands Cultural Society
<  www.AlbertHall.org  >
--
Angelo Campanella - 02 Jun 2004 17:03 GMT
> It's not science fiction.  Check out:
> < http://www.atcsd.com/pdf/HSSWHTPAPERRevE.pdf >
> for an overview of the technology.

    Good work!  I recommend it as required reading for this group. we need
to get clear on this benchmark techmology in 'Modern Acoustics'.

    Angelo Campanella

             ---------   www.CampanellaAcoustics.com  ---------

"I have simply studied carefully whatever I've undertaken, and tried to
hold a reserve that would carry me through." - Charles A. Lindbergh.

"As for background noise level; 35 dBA is a good classroom; 45 dBA is a
sound masking system!" - Anthony K. Hoover
The Ghost - 03 Jun 2004 02:53 GMT
> > It's not science fiction.  Check out:
> > < http://www.atcsd.com/pdf/HSSWHTPAPERRevE.pdf >
[quoted text clipped - 4 lines]
>
>     Angelo Campanella

I recommend it also, but only as an item of curiosity.  Despite its
mindless acceptance and increasing use, the long term impact of
high-intensity ultrasound on human hearing is something that remains
to be determined.  Furthermore, it can hardly be categorized as
"benchmark technology" in "Modern Acoustics."  The truth of the matter
is that it is nothing more than an airborne application/extension of
parametric sonar technology that is decades old.  In fact, the
airborne application is nearly a decade old. Too bad you are just a
tad bit behind on technogical developments.
CEA - 08 Jun 2004 14:18 GMT
> > > It's not science fiction.  Check out:
> > > < http://www.atcsd.com/pdf/HSSWHTPAPERRevE.pdf >
[quoted text clipped - 14 lines]
> airborne application is nearly a decade old. Too bad you are just a
> tad bit behind on technogical developments.

I did find the discussions on "Directivity Sticks" to be interesting (hmm,
can't google it anymore).  Even that only projected sound a few hundred
feet.  I also remember reading on some defense departments website that
acoustic weapons research was abandoned because of lack of progress and
proof of concept.  Other than giving someone a headache and loosing some
bodily functions, it wasn't of much use for killin.  I suspect the power
efficiency for such a device was far to small to even be considered.  It
takes a tremendous amount of energy to "displace" a particle bigger than a
few molecules wide.   I think the defense article did imply that it is still
considering acoustics for non-lethal defense and crowd control.   Yes, I
know about sonar.

-Eric
Angelo Campanella - 08 Jun 2004 17:05 GMT
>>Angelo Campanella <a.campanella@att.net> wrote in message
>>>Good work!  I recommend it as required reading for this group. we need
>>>to get clear on this benchmark techmology in 'Modern Acoustics'.

    I appreciate that some believe this technology to be trivial, and
likely useless for practical applications.

    But what I am driving at is he fact that the article provides some
insight into the nonlinear processes to be found in acoustical
phenomena. (i.e. it is not the 'linear acoustics' that has been detailed
by Lord Raleigh, Sabine and followers.) As such, it is worthy of knowing.

    Angelo Campanella
The Ghost - 26 Jun 2004 01:31 GMT
> >>Angelo Campanella <a.campanella@att.net> wrote in message
> >>>Good work!  I recommend it as required reading for this group. we need
[quoted text clipped - 9 lines]
>
>     Angelo Campanella

The technology is neither trivial nor useless for practical
applications.  For example the technology, using a 5MHz resonant
focused transducer excited by equal amplitude summed 5.000MHz and
5.002MHz signals, enables one to generate in water a pressure/force at
2KHz which is confined to a 1mm square area at the focal point.  One
recent application of this technology, in which I have been involved,
is the assessment of the existence of structural flaws/cracks in
implanted heart valves.  Accordingly, in my opinion, it is the recent,
novel applications of the technology, not the technology itself, that
"benchmark."
 
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