Advanced embedded code hopping system
AssigneeDirected Electronics, Inc.
InventorsDarrell E. Issa, Jerry W. Birchfield, Charles Chen
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Abstract
A system for monitoring and controlling an area comprising a controller for controlling system operational functions; at least one remote-control transmitter for transmitting system commands to the controller in a code word having a fixed word and a hopping word therein; the fixed word comprising at least one fixed data bit and the hopping word comprising at least one changing data bit, wherein the hopping word changes its binary value from transmission to transmission of the system commands; and, means for scrambling bits of the fixed word and bits of the hopping word within the code word.
Claims34
A system for monitoring and controlling an area comprising:
- a) a controller for controlling system operational functions;
- b) at least one remote control transmitter for transmitting system commands to said controller in a code word having a fixed word and a hopping word therein;
- c) said fixed word comprising at least one fixed data bit;
- d) said hopping word comprising at least one changing data bit, wherein said hopping word changes its binary value from transmission to transmission of said system commands;
- and,
- e) a format word resident in said transmitter and said controller for respectively scrambling and descrambling said bits of said fixed word and said bits of said hopping word within said code word to generate a scrambled code word transmitted from said transmitter to said controller.
Method for monitoring and controlling an area comprising the steps of:
- a) storing an initial hopping word within a remote control transmitter and a controller;
- b) storing a fixed word within said remote control transmitter and said controller;
- c forming a scrambled code word by using a format word to interlace bits from said fixed and said hopping words and transmitting said scrambled code word to said controller.
Dependencies are inferred from the claim text.