Abstract: A communication system having a transmitter section and a receiver section. The transmitter converts an analog signal into a succession of binary coded words of equal length. The words are spaced apart by a fixed period of time. The succession of binary coded words represents the amplitude of the analog signal and is converted into a corresponding succession of bursts of energy, each burst of energy representing a bit of the binary coded word and having either a frequency at F0, representing a "0" in the binary coded word, or a frequency F1, representing a "1". The receiver section of the communication system receives the succession of bursts of energy and converts it into a succession of binary coded words representative of the originally transmitted words. A digital-to-analog converter provides a signal representative of the original analog signal from the succession of binary coded words.

Abstract: A duplex outlet device for use in an automotive vehicle having a cigarette lighter device defined by a cup-shaped socket. The outlet device includes a plug portion adapted to be received in the lighter socket and defines a pair of outer sockets each of which is provided with a pair of electrical contacts. One of the outer sockets may receive the cigarette lighter plug portion and the other of the sockets may receive an auxiliary plug to provide electrical power to auxiliary equipment, such as a CB radio of the vehicle. The outlet device may further include an antenna connector which may be removably carried by the portion of the outlet device defining the socket. The electrical circuit leading to the contact of the second socket may be connected in series with a suitable fuse and manually operable switch, as desired. The device may further include a manually operable locking device for effectively positively securing the device plug portion in the vehicle lighter socket.