Secure remote control communication systems

Details Secure remote control communication systems Secure remote control communication systems

1975-05-15

1977-01-25

Waring, Alvin H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 37, 325 64, 340171A, H04B 700

Patent

active

040054284

ABSTRACT:
Coded messages, for use in the remote control of equipment for example, are transmitted and received in a manner in which substantially precludes unauthorized or accidental activation of a control associated with the receiving means. This secure communication is accomplished by generation of a plurality of carrier frequencies in a predetermined sequence and by the modulation of each carrier frequency in accordance with a digital code. The receiving means, which is initially tuned to receive the first carrier in a transmission sequence, detects and decodes the received signals and stores the decoded message whereby equipment to be controlled may be responsive to the entire received message; the receiver being retuned to another carrier after each bit of a coded message is detected.

REFERENCES:
patent: 3906348 (1975-09-01), Willmott

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