Abstract: Encoded electrical control systems for household applications each employ an encoder/transmitter that provides an encoded signal and a receiver/decoder which effectuates control of an associated device only upon receipt of a signal containing the code unique to that specific receiver/decoder.For household applications, a separate receiver/decoder, each having its own recognition code, is associated with each power outlet or electrical device to be controlled. A common controller includes an encoder/transmitter and a control switch for each device, along with means such as an rf carrier source and modulator, for transmitting all the encoder/transmitter outputs over the electrical distribution system. When a particular switch is actuated, the associated encoder/transmitter sends a signal containing the code of the corresponding receiver/decoder, which in turn effectuates the intended control function.

Abstract: An encoded electrical control systems for motor vehicle employs an encoder/transmitter that provides an encoded signal and a receiver/decoder which effectuates control of an associated device only upon receipt of a signal containing the code unique to that specific receiver/decoder.For motor vehicle applications, a secure ignition system is acheived by enclosing the encoder/transmitter in a tamperproof housing associated with the ignition switch assembly. The encoded signal is transmitted when the ignition switch is closed. The receiver/decoder is contained in another tamperproof housing adjacent an ignition system component essential to engine operation, and, only upon receipt of the unique, encoded signal from the transmitter, effectuates a necessary electrical connection to this ignition system component. Operation also may be initiated by an electronic lock in place of the conventional ignition switch.