04174517 is referenced by 117 patents and cites 12 patents.

A system for use in a facility, such as the home, equipped with a common power distribution system, for controlling, from a central location, the operation of a plurality of remote devices. The system includes a central control unit including a memory for storing user-entered command information, preset instructions, time-of-day information, and remote-device selection information. The time-of-day information is compared with the current time-of-day and, in the presence of a time match, the command information and the remote-device selection information is modulated in a serial binary format onto a carrier signal which is coupled directly to the electrical system. A receiver/demodulator unit coupled to the electrical system and to a remote device receives the information from the central control unit and, if the command information is intended for the remote device with which the receiver/demodulator unit is associated, acts on such command information for controlling the operation of the remote device. The system also includes a receiver/demodulator/transmitter unit coupled to the power distribution system and to a remote device including a sensor for receiving and demodulating interrogation signals from the central control unit, for transmitting to the central control unit a signal indicative of the status of the remote device, and for receiving and demodulating command signals for controlling the operation of the remote device; a portable control unit for transmitting command information to the central control unit; and a unit for converting speech to a signal modulated with command information for transmission to the central control unit.

Central system for controlling remote devices over power lines
Application Number
Publication Number
Application Date
July 15, 1977
Publication Date
November 13, 1979
Jerome Mandel
15601 Whiteoak La., Huntington Beach, 92647
Philip M Hinderstein
H04M 11/00
H04B 3/54
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