Reference: https://pythagoreanorderofdeath.ning.com/m/blogpost?id=4741980%3ABlogPost%3A24968
Silent Sound
Oliver Lowery's silent sound, U.S. patent 5,159,703, is the current method for "subliminal sound." "Silent Sound" replaced "time slice" subliminal sound, in which small slices of a subliminal message were inserted into an audio stream, such as at movie or on TV, to influence the listener. Silent Sound is mixed with audio in places like department store background music systems to discourage shoplifting.
Although enhancements have been developed, at its simplest, a Silent Sound voice encoder takes a spoken message, and uses a circuit similar to a telephone voice changer to raise the frequency of the voice up near (but not exceeding) the upper limit of human hearing. The listener hears a fluctuating high-pitched tone, and any words cannot be discerned, consciously.
However, the brain can subconsciously decode the words. The brain takes advantage of the fact near the upper limit of hearing, the sensitivity to frequencies drops off. The sensitivity curve is sloped downwards in the Silent Sound frequency range, roughly 14,000 to 16,000 Hertz (cycles per second.) For readers with knowledge of radio detector circuits, recovering audio from a frequency modulated (FM) converted voice signal is done using "slope tuning "Silent Sound" is not a through-wall device by itself. However, when Silent Sound is transmitted to a target by way of a voice to skull through-wall transmitter, if the target is susceptible to hypnosis (many people are), the target's thought processes and personality could be severely disrupted over time, and the target would have no idea why this was happening, as the sound is essentially silent. The target may hear a high pitched tone or hiss, but no words. The target would be much less able to resist hypnotic suggestions than with audible speech.
It should be noted that many targets report hearing frequent or constant high-pitched tones or hissing. (I know I do)
"Silent Sound" subliminal hypnotic suggestion can also be piggybacked on to a target's cable TV or radio listening, or even just sent as sound through the air.
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Voice to Skull
Joseph Sharp's voice to skull success, performed with Dr. James C. Lin's pulsed microwave transmitter, and publicly announced in 1974 at the University of Utah, at a seminar presented to the faculties of engineering and psychology.
That seminar, and the operating principle of Sharp's successful experiment, were described in the March 1975 "American Psychologist" journal. The operating principle, which has been improved upon in the more than three decades since Sharp's success, is based on the fact that one microwave radar pulse of medium to high power can produce an audible click in the hearing sense of a person in line with the signal. That effect has been called "radar hearing" since World War II.
Dr. Joseph Sharp used a computer to cause one microwave radar-like pulse to be transmitted every time a speaker's voice wave form swung from high to low.
The result was that when Joseph Sharp sat in line with a microwave transmitter transmitting pulses as shown above, he could hear a "robotic" voice speaking the numerals 0 to 9. He did not carry the experiment further, at least according to available records. Sharp's experiment took place in 1973, and although the potential for microwave radiation to cause cancer wasn't as widely known, it may be that radiation danger is the reason this technology has not, at least publicly, been developed further.
Research into radar hearing by Dr. Allen Frey in the 1960s established that roughly three tenths of a watt per square centimeter of skull surface is required to generate the clicks from which the voice is synthesized. Synthesis of voice from clicks is a primitive form of "digital audio."
For some years in the 1990s and early 2000s, the United States Army recognized "voice to skull" technology, which they abbreviated as "V2K," in their on line thesaurus. For reasons unknown, the Army removed that thesaurus entry circa 2007.
Some references to developing more advanced types of voice to skull can be found among patents, and rare United States Air Force references to the technology in the late 1990s forward.
Voice to skull (V2S/V2K), a commercial version dubbed MEDUSA - "Mob Excess Deterrent Using Silent Audio", was proposed for commercial development for military and police use, per ABC news in summer 2008.
Targets report invasive sound transmissions of good fidelity at various times of day. Voices saying profane and disparaging things are common. False sounds of telephones ringing, pagers beeping, alarm clocks going off, knocking on the target's door, and other sounds have been reported. The fidelity of these transmissions indicates improvement over the method demonstrated by Dr. Joseph Sharp.
