Interesting too, that those who have complained about electronic harassment report noises from neighbours, especially in apartment settings, which are perfectly synchronized with the actions of the targeted person. One target complains that for years, every time she would start to urinate, the water in the downstairs bathroom would be turned on, and kept on, and turned off when the target's urine stream stopped. Every time.
By now some readers will be thinking, there can't be any more, can there? Unfortunately for society, yes, there is more.
In World War II, radar came into being. Technicians standing near energized antennas discovered that the radar signals, which are streams of very short, powerful microwave pulses, cause a buzzing sound to be heard, as if it were originating within or behind the skull.
Simply, one short pulse of microwave signal causes one click in the hearing sense of someone standing in line with a moderately powerful signal.
We don't hear ordinary microwave communications signals because they aren't short pulses. It's the pulsing that acts like tapping a nail with a hammer, to force sound into the hearer's hearing sense.
In 1974, at the University of Utah, the successful transmission of VOICE into the skull of a test subject, using only a pulsed microwave signal, with no special implants or other artificial aids, was announced. The experimenter was Dr. Joseph Sharp, then affiliated with the Walter Reed Army Institute of Research, using a pulsed microwave transmitter supplied by Dr. Joseph Lin of the University of Chicago.
Dr. Sharp used a simple algorithm to convert a smooth voice wave form into a string of "clicks", with each click being sent at the test subject as a short microwave pulse.
Sharp's success was published in the official journal of the American Psychological Association, "American Psychologist", in their March, 1975 issue.
And not unexpectedly, the U.S. Air Force announced an updated version of "voice to skull" with better fidelity than Joseph Sharp's original, in 1994.
A moderately powerful radar set can produce a buzzing sound in the skull of someone in direct line with the antenna. A couple of hundred watts will do, and that's not huge piece of equipment.
A criminal wanting the ultimate "revenge weapon" need only co-opt the services of a radar technician, to modify the set so that Joseph Sharp's voice conversion method would control the pulsing. The criminal can then, from hiding, through non-conducting walls, force a target in the next apartment or house to hear things, including voices, involuntarily.
A little pricey, but not out of reach of the upper middle class. Not at all.
By now, you can probably guess, YES, many of the 720 people complaining to the Justice Department also hear various strange sounds, including voices.
But for 33 years, it has been no secret that this can be done by equipment, and is not a guaranteed indication that the hearer is mentally ill. Unfortunately, just as most police officers deny radio frequency crimes are possible, so do most psychiatrists, resulting in false diagnoses, and heaping considerable trouble on already struggling targets of radio frequency crimes.
As of the date of writing, those are the proven beyond doubt, through wall, radio frequency weapons available to the sophisticated criminal. But there is one little encore item, called "Silent Sound." Silent Sound carries U.S. patent #5,159,703.
Know about those telephone voice changers? Which can take a deep male voice and move it up into a high female frequency range to disguise the caller? Well, "Silent Sound" uses a similar technology to raise a speaker's voice a little higher, up near the upper limit of hearing.
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