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Interactive Research Tool  ·  US Patent 3951134

Malech Patent Visualizer

Apparatus for remotely monitoring and altering brain waves  ·  Filed 1974  ·  Robert G. Malech  ·  Dorne & Margolin Inc.

Patent No.  US 3951134 A
Filed  August 5, 1974
Issued  April 20, 1976
Class  A61B 5/0476
Status  Visualizer Active
Simulation model only  ·  Educational and research reference  ·  Patent is public record  ·  US Patent and Trademark Office
Signal Parameters
Carrier Frequency
100MHz
ELF overlay: 10 Hz

Two RF signals transmitted to the subject. The carrier modulates the ELF brain-wave signal per patent claim 1. Range: 10 to 200 MHz.

Subject Distance
50m
Signal: nominal

Patent claims remote operation. Signal attenuation increases with distance squared. Detection threshold at far range depends on transmitter power.

Transmitter Power
40W
Output: standard

Output power determines effective range and SNR at the receiver. Higher power extends range at cost of RF detectability.

ELF Modulation
10Hz
Alpha band: 8 to 12 Hz

ELF overlay frequency. Delta: 1 to 4 Hz. Theta: 4 to 8 Hz. Alpha: 8 to 12 Hz. Beta: 12 to 30 Hz. Gamma: 30+ Hz.

Signal Status: Nominal
Live Waveform — EEG Response Model
Signal Analysis
Effective Range
382 m
At current power
Signal Strength
-42 dB
At target distance
Brain Band
Alpha
ELF overlay target
Detectability
Low
RF signature estimate
Patent Diagram — Signal Path Visualization

US3951134A — Patent Excerpt

"A pair of radio frequency signals are transmitted to the brain of the subject being monitored. The signals are modulated with an ELF signal..."

"...the brain's electrical activity is detected and analyzed remotely. The operator may alter the brain wave pattern of the subject by adjusting the transmitted signal..."

"...the received signals are demodulated to recover the ELF component, which corresponds to the electroencephalographic activity of the subject."

"...a feedback circuit compares the received brain wave signal with a reference and generates a correction signal to modify the transmitted frequency..."

Filed: Aug 5, 1974  ·  Issued: Apr 20, 1976
Assignee: Dorne & Margolin Inc.
Inventor: Robert G. Malech
Source: US Patent and Trademark Office

TRANSMITTER 100 MHz 40W SUBJECT RECEIVER DEMODULATOR Low detect ANALYZER EEG DECODE Alpha 10Hz FEEDBACK LOOP 50 m

Real-Time Analysis

Penetration Depth
Moderate — 4 cm tissue
EEG Entrainment Index
Alpha sync — 72% coherence
Return Signal Clarity
SNR +14 dB — readable
RF Detectability Risk
Low — below scan threshold
Feedback Loop Stability
Stable — locked on signal

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