Thursday, February 25, 2016

PATENT# 6470214 – USAF – Device for Implementing RF Hearing Effect 10.22.2002

I published this in an earlier post located hereBut I think it would be good to republish it once again. Please also see this post hereIn addition, this is also a good video to watch about becoming a human node in a world surveillance network. The reality is, this is already happening.

~Synopsis ~ 


ABSTRACT: 

A modulation process with a fully suppressed carrier and input preprocessor filtering to produce an
encoded output; for amplitude modulation (AM) and audio speech preprocessor filtering, intelligible
subjective sound is produced when the encoded signal is demodulated using the RF Hearing Effect.
Suitable forms of carrier suppressed modulation include single sideband (SSB) and carrier suppressed amplitude modulation (CSAM), with both sidebands present.

(Note: In other words, using remodulated signals for speech from your 'brain map' they can put 'voices (speech) into your head' by sending these signals to the inner ear which then sends them to the acoustic brain via the auditory nerve.)


SUMMARY OF THE INVENTION​

1. A method of encoding an input audio signal a(t) to produce a double sideband output signal
having a .omega..sub.c carrier frequency, which when transmitted to the head of a receiving
subject, will by the radio frequency hearing effect induce a thermal-acoustic signal in the
bone/tissue material of the head that replicates the input audio signal and is conducted by the
bone/tissue structure of the head to the inner ear where it is demodulated by the normal
processes of the cochlea and converted to nerve signals which are sent to the brain, thereby
enabling intelligible speech to be perceived by the brain as any other nerve signal from the
cochlea, the method comprising: applying an input audio signal a(t) to an audio pre-distortion
filter with an As(f) filter function to produce a first output signal a(t)As(f); adding a very low
frequency bias A to the first output signal to produce a second output signal a(t)As(f)+A;
applying the second output signal to a square root processor to produce a third output signal
(a(t)As(f)+A).sup.1/2 ; applying the third output signal to a balanced modulator to produce a
double sideband​1 output signal (a(t)As(f)+A).sup.1/2 sin(.omega..sub.c t), where .omega..sub.c
is the carrier frequency; and transmitting the double sideband output signal to the head of the
receiving subject.

2. The method of claim 1, wherein the As(f) filter function step further comprises the step of
de-emphasizing the high frequency content.​
 ​
3. The method of claim 1, wherein the further step of suppressing one of the sidebands of the double
sideband output signal is done resulting in a single sideband modulation transmission.

DETAINED DESCRIPTION OF THE PREFERRED EMBODIMENT​

 With reference to the drawings, FIG. 1 illustrates the RF to acoustic demodulation process of the
invention. Ordinarily and acoustic signal A reaches the outer ear E of the head H and traverses first to the inner ear I and then to the acoustic receptors of the brain B. A modulated RF signal, however,
enters a demodulator D, which is illustratively provided by the mass M of the brain, and is approximated, as shown in FIG. 2, (not available) by a sphere S of radius r in the head H. The radius r of the sphere S is about 7 cm to make the sphere S equivalent to about the volume of the brain B. It will be appreciated that where the demodulator D, which can be an external component, is not employed with the acoustic receptors of the brain B, it can have other forms.

(Note: this external component can be wearable technology or a remote receiver/transmitter device such as nanotechnology or brainchips.)

The sphere S, or its equivalent ellipsoid or similar solid, absorbs RF power which causes an increase in temperature that in turn causes an expansion and contraction which results in an acoustic wave. As a first approximation, it is assumed that the RF power is absorbed uniformly in the brain. Where the demodulator D is external to the brain B, the medium and/or RF carrier frequency can be selected to assure sufficiently uniform absorption.

(Note: This 'sphere S' as defined above would be the skull's bone/tissue matter “of the head” )

For the modulated RF signal of FIG. 1, the power absorbed in the sphere S is proportional to the power waveform of the modulated RF signal. The absorption rate is characterized quantitatively in terms of the SAR (Specific Absorption Rate) in the units of absorbed watts per kilogram per incident watt per square centimeter.​

The temperature of the sphere S is taken as following the integrated heat input from the power
waveform, i.e. the process is approximated as being adiabatic, at least for short term intervals on the
order of a few minutes.

(Note: An adiabatic process is one that occurs without transfer of heat or matter between a system and its surroundings.[1][2] The adiabatic process provides a rigorous conceptual basis for the theory used to expound the first law of thermodynamics, and as such it is a key concept in thermodynamics.  Some chemical and physical processes occur so rapidly that they may be conveniently described by the "adiabatic approximation," meaning that there is not enough time for the transfer of energy as heat to take place to or from the system.[3] Coincidentally, 'adiabatic' in terms of data processing and computing refers to quantum computing.)

The radial expansion of the sphere (or the bone/tissue matter of the head) follows temperature and is
converted to sound pressure, p(t), determined by the radial velocity (U.sub.r) multiplied by the real part of the specific acoustic impedance (Z.sub.s) of the sphere, as indicated in equation (1), below. (Note: not show in this report – go to link provided for entire patent information.)​

The specific acoustic impedance for a sphere of 7 cm radius, on the order of the size of the brain, has a lower cut-off break frequency of about 3,547 Hertz (Hz) for the parameters given for equation (1). The essential frequency range of speech is about 300 to 3000 Hz, i.e., below the cut-off frequency.

(Note: They are talking about firing wireless signals which can penetrate the bone/tissue matter of the head in order to create these desired effects.​)

 In the speech spectrum, which is below the brain cut-off frequency, the sphere S is an acoustic filter
which "rolls off", i.e. decreases in amplitude at -40 dB per decade with decreasing frequency. In
addition to any other demodulation processes to be analyzed below, the filter characteristics of the
sphere will modify the acoustic signal with a 40 dB per decade slope in favor of the high frequencies.​

 Results for an AM Modulated Single Tone​

 The SPL (Sound Pressure Level), in acoustic dB, is approximated as 20 log[p(t)/2E-5]. The standard
acoustic reference level of 2E-5 Newtons per square meter is based on a signal in air; however, the
head has a water-like consistency. Therefore, the subjective level in acoustic dB is only approximate, but sufficient for first order accuracy.​

 Below the cutoff frequency the real part of the impedance varies as the square of the frequency or
gives a boost of 40 dB per decade. Therefore, if the input modulation signal is 1 kHz, the second
harmonic will have a boost of about 4 time in amplitude, or 12 dB, due to the variation of the real part of the specific acoustic impedance with frequency. So the second harmonic pressure term in equation (8) is actually four times the power or 6 dB higher than the fundamental term. If the second harmonic falls above the cutoff frequency then the boost begins to fall back to 0 dB. However, for most of the speech spectrum there is a sever distortion and strong boost of the high frequency distortion components.

(Note: An AI system running sophisticated dynamic algorithms can compensate for any 'server distortions' experienced in a signal to signal transference/modulation. A system such as this that sits on a GIG (neural net) that is mapping the Human Nodes on a network can also transmit the signal information instantaneously by satellite to a computer anywhere on the planet.​)

Results for Two Tone AM Modulation Analysis​

 Because of the distortion attending single tone modulation, predistortion of the modulation could be
attempted such that the resulting demodulated pressure wave will not contain harmonic distortion. This will not work, however, because of the non-linear cross-products of two-tone modulation are quite different from single tone modulation as shown below.

(Note: It would appear that there is tech now relating to 'coherent demodulators' ( DSBSC-AM) using a Costas Loop.​2​3​)

Nevertheless, two-tone modulation distortion provides an insight for the design of a corrective process for a complex modulation signal such as speech. The nature of the distortion is defined in terms of relative amplitudes and frequencies.

(Note: The 'corrective process' technology referred to is here.​)

However, the serious distortion problem can be overcome by means of the invention which exploits the characteristics of a different type of RF modulation process in addition to special signal processing.​

AM Modulation with Fully Suppressed Carrier for the Intelligible Encoding of Speech by the
Invention for Compatibility with the RF Hearing Phenomena​

The output of the balanced modulator is applied to a spherical demodulator, which recovers the input
signal a(t) that is applied to the inner ear and then to the acoustic receptors in the brain.

(Note: This is hacking the acoustic center of the brain.​)

The invention provides a new and useful encoding for speech on an RF carrier such that the speech will be intelligible to a human subject by means of the RF hearing demodulation phenomena. Features of the invention include the use of AM fully suppressed carrier modulation, the preprocessing of an input speech signal be a compensation filter to de-emphasize the high frequency content by 40 dB per decade and the further processing of the audio signal by adding a bias terms to permit the taking of the square root of the signal before the AM suppressed carrier modulation process.​

The invention may also be implemented using the same audio signal processing and Single Sideband (SSB) modulation in place of AM suppressed carrier modulation. The same signal processing may also be used on Conventional AM modulation containing both sideband and the carrier; however, there is a serious disadvantage. The carrier is always present with AM modulation, even when there is no signal.

The carrier power does not contain any information but contributes substantially to the heating of the
thermal-acoustic demodulator, i.e. the brain, which is undesirable. The degree of this extraneous heating is more than twice the heating caused by the signal or information power in the RF signal. Therefore conventional AM modulation is an inefficient and poor choice compared to the double side-band suppressed carrier and the SSB types of transmissions.

(Note: So it would appear that this technology can also, at high enough frequencies/power, fry a target's brain. It is also worth restating at this point, that technology exists today to overcome the 'disadvantages' cited above.​)




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The only 1 of 8 images available on US Patent site

Research Links:

President's Commission for the Study of Bioethical Issues letter to respondent 07.27.2011
Patent # 003951134 Distant Brain Reading & Brain Wave Manipulation 4.10.1976
Patent # 6011991 Communication system and method including brain wave analysis and/or use of
brain activity 01.04.2000
Patent # 6470214 USAF RF Hearing Effect for skull/tissue penetrating sound
Patent # 6587729 Similar to Patent # 6470214
Double Sideband Suppressed Carrier Amplitude Modulation and Coherent Detection
Journal of Lightwave Technology  August 1, 2008
Demodulation of AM Signals – Restoring/recovering message signal from the received modulated
waveform that is generally corrupted by noise.

1 The standard AM modulated signal contains a sinusoidal component at the carrier frequency which does not convey any of the baseband message information. This component is included to create a positive envelope which allows demodulation by a simple, inexpensive envelope detector. From an information theory point of view, the power in the sinusoidal carrier component is wasted. In this experiment, you will see that it is not necessary to transmit the carrier component and that the baseband message can be recovered by a coherent demodulator. In fact, it can be shown that
a coherent demodulator performs better than an envelope detector when the received signal is corrupted by additive noise.

The type of modulation that will be studied in this chapter is called double-sideband suppressed-carrier amplitude modulation (DSBSC-AM). A close approximation to an ideal coherent demodulator called a Costas loop will be implemented.

Source:  Springer Link
2 Journal of Lightwave Technology  August 1, 2008
3 Demodulation of AM Signals – Restoring/recovering message signal from the received modulated waveform that is generally corrupted by noise.

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