Matches 201 - 250 out of 295 < 1 2 3 4 5 6 >
Match Document Document Title
4559520 Method for communication utilizing multi-mode reception  
A method for improving signal quality while simultaneously enhancing the data rate in a communications system in which individual signaling events are, at least in principle, capable of...
4556866 Power line carrier FSK data system  
A frequency shift keyed (FSK) data transmission system utilizes existing power lines to transmit data by superimposing a high frequency FSK signal on the power line carrier. A transmitter includes...
4550416 Digital transmitter  
A solid state remote monitoring transmitter which transmits a 40 bit word that contains status information about a transformer via the secondary of a power distribution network to a central...
4540890 System for selectively addressing electrical control signals from a control unit to a plurality of remote units  
The system comprises a central control unit and a plurality of remote units connected to the control unit by a single, common, transmission link. This link acts simultaneously as a signalling link...
4538136 Power line communication system utilizing a local oscillator  
Disclosed is a power line transmission system which generates a narrow band multi-frequency shift keyed signal having a first predetermined frequency representing a first state of information...
4535401 Apparatus and method for providing power from master controller to subcontrollers and data communication therebetween  
An apparatus having a two wire system for providing both power and data communication between a master controller and at least one subcontroller. The master controller can also be connected through...
4535447 Remote monitoring system transmitter  
A solid state remote monitoring transmitter which transmits a 40 bit word that contains status information about a transformer via the secondary of a power distribution network to a central...
4528667 System for the transmission of information messages  
A house system for the transmission of information messages which are encoded in the form of digital signals wherein a code is selected which facilitates the testing of each information bit,...
4520488 Communication system and method  
A communication system for communicating analog and digital data with a process variable, e.g., pressure, transmitter over the two wires which supply power to the transmitter apparatus. The digital...
4514719 Data transmission system utilizing power line of 3-phase alternating current  
A transmitter connected to any phase of a 3-phase alternating current transmits a data subsequent to a lock signal in synchronism with the cycles of the phase. A receiver connected to any phase of...
4471399 Power-line baseband communication system  
A communication system for transmitting baseband digital signals on an electrical power line. A pulse generator produces digital signals which are limited to a frequency spectrum of 30 kHz to 300...
4471232 Method of and apparatus for controlling loads on an electrical power supply  
To enable a consumer of electrical energy to effect control of total energy consumption by various individual appliances and loads, each individual load has a control unit, conveniently in a plug...
4468792 Method and apparatus for data transmission using chirped frequency-shift-keying modulation  
A method for transmission of digital data utilizes a carrier frequency offset in a first frequency direction for a first binary condition, and offset in a second frequency direction for the...
4453156 Load control receiver and method of operation  
Method for detecting the presence or absence of an audio-frequency signal (V T ) superimposed on a power supply network, the audio-frequency signal (V T ) having a known frequency (f T ) and an...
4446462 Method and apparatus for multiple frequency transmission of information in a digital communication system  
A meter terminal unit, for acquiring information and transmitting the acquired information to a central reading and control unit over utility power transmission lines, includes a transmitter...
4438519 Methods, and apparatus, for transmitting high-bit-rate digital data in power line communication media having high harmonic noise content  
In a power line data communications system, high-bit-rate digital data is transmitted through a communications media, having high harmonic noise content, by use of a frequency-modulated chirp...
4418333 Appliance control system  
An appliance control system includes a central control unit and a plurality of slave units each including a user-programmable microprocessor and respectively plugged into outlet sockets of a power...
4413250 Digital communication system for remote instruments  
A communication system for communicating digitally encoded information from a remote transmitting station to a central receiving station. The central station supplies d-c operating power to a...
4408185 Process for transferring information and system for carrying out the process  
An arrangement for transferring both power and information on one or more common AC power lines in which a first type of information is transmitted by terminating the current from the power supply...
4400688 Method and apparatus for communication over electric power lines  
A method and an apparatus for communicating over electric power lines in a direction from load to source is disclosed. The power line voltage wave is loaded in a predetermined pattern to produce a...
4386436 Television remote control system for selectively controlling external apparatus through the AC power line  
A remote control system utilizes a portion of television receiver system to control an external appliance through the AC power supply line. The user enters an appliance control command into the...
4380009 Message communication system  
A message communication system which provides instant messages and memoranda at a telephone user's desk. In an office complex, a message is transmitted over pre-existing office power lines to...
4379284 Coherent phase shift keyed demodulator for power line communication systems  
An apparatus and method for coherent phase demodulation of a binary phase shift keyed carrier includes sequentially processing plus and minus polarity samples of plural carrier segments occurring...
4378533 Modulator for injecting signals into a polyphase power transmission system  
A modulator for injecting signals into a polyphase power transmission system includes a bridge of four thyristors for each phase. The thyristors of each bridge are connected so that when the...
4377804 Synchronous data transmission system utilizing AC power line  
A data transmission system utilizing a power line transmits a data signal of a plurality of bits in a serial fashion in synchronism with the cycles of the alternating current of a power supply. A...
4371867 Transmitting signals over alternating current power networks  
To transmit signals over an alternating current power distribution network, the network load parameters are modulated by means of non-linear elements or by varying the characteristics of components...
4370563 Method of and apparatus for load and/or load control signaling to customers in a power system  
Information is conveyed from a transmitting site to a consuming location in an electric power system by varying the frequency of the power from the nominal standard generating frequency. The...
4359644 Load shedding control means  
An electrical information transmitting means for consumer load control comprises a transmitter which transmits a coded signal through the conductors of an alternating current electrical...
4357605 Cash flow monitoring system  
A computerized monitoring system which incorporates the power lines that provide electrical power to the remote devices as the physical communications medium of a serial data bus for the computer...
4329678 Method and apparatus for remotely controlling an electrical appliance  
A transmitter (12) has an output (13) adapted to be connected across an alternating current power line (AC1, AC2) at a point remote from an appliance (24) to be controlled. The transmitter...
4328482 Remote AC power control with control pulses at the zero crossing of the AC wave  
A remote control for the control of AC power uses the AC power wave of an existing AC power line for the transmitting control signals from a control location to a remote location. A transmitter at...
4323882 Method of, and apparatus for, inserting carrier frequency signal information onto distribution transformer primary winding  
Power line carrier frequency signals are provided at a distribution transformer primary winding by controlled current injection onto the neutral and phase conductors of the distribution transformer...
4321581 Powerline carrier control system  
A powerline carrier control system having a carrier transmitter which delivers an audio-frequency output voltage, subdivided into transmitted pulses, to a power-line carrier control receiver via a...
4302844 Carrier transmission through harmonic polluted medium  
A carrier signal modulated with digital data is transmitted through a medium polluted with harmonic signals by asymmetrically positioning the carrier signal frequency between two adjacent harmonics...
4296462 Inverter controller  
An inverter controller for controlling a three-phase inverter used for generation and subsequent injection of pulse code signals on power lines in a utility load management system is disclosed. The...
4272758 Arrangement for providing a power supply and transmitting electrical signs between two devices using a small number of contacts  
An arrangement for both exchanging data between first and second devices and supplying power from the first to the second device, all through only two interconnecting lines or contacts. Data...
4245215 Power line signalling system  
A system for transmitting data from a transmitter to a receiver via an alternating current power line connecting the transmitter and receiver. The transmitter suppresses half cycles of the power...
4222035 Multiplex system having digital coded power line signals  
An electronic control circuit is disclosed herein for transmitting a coded signal and operating power to a selected one of a plurality of receivers via a single pair of wires. The control circuit...
4218769 Means for subdividing a baud period into multiple integration intervals to enhance digital message detection  
A carrier signal bearing digital data which varies a characteristic of the carrier signal during each baud period in a predetermined manner to identify the baud value during the period is...
4199761 Multichannel radio communication system for automated power line distribution networks  
An automated electric power distribution network includes a radio communication system for transmitting multipurpose, multitone signals in one or more signaling channels over the auxiliary channel...
4190800 Electrical load management system  
A central station monitors the use of electrical power and when peak demand periods occur, coded information is transmitted by radio from the central station to remote receivers mouned on poles...
4179624 Carrier control method by using phase-pulse signals  
A carrier control method using phase-pulse signals in which a plurality of terminal-selection channels and a plurality of returning channels having a predetermined phase width respectively are...
4174517 Central system for controlling remote devices over power lines  
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...
4173754 Distributed control system  
A redundant digital address and function code is generated at a central location and transmitted through a signal circuit or an A.C. power distribution circuit to a plurality of receiver locations....
4163218 Electronic multiple device control system  
An electronic control system which can control the operation of a number of electrical devices such as lights, outlets, sensing apparatus, etc., all of which are energized from the same power...
4162486 Encoded electrical control systems  
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...
4139737 Time division multiplex transmission system in which electrical power is transmitted to remote terminals from a central unit simultaneously with address and control signals  
A time division multiplex transmission system including a central unit and a plurality of terminal units connected through a single pair of bus lines to the central unit. The central unit transmits...
4136327 Well survey system modulation technique  
A single pair of conductors in a drill cable in a borehole is used not only to transmit power into the hole, but to transmit control commands into the hole, and to communicate sensor data back up...
4131881 Communication system including addressing apparatus for use in remotely controllable devices  
A data communication system includes apparatus for use in each of a plurality of simultaneously addressable terminal units. Means are provided for recognizing a large number of addresses to allow...
4131882 Digital two-wire irrigation control system with feedback  
A method and apparatus for the control of a number of valves in an irrigation system utilizing only two lines between a central encoder and a number of remotely located decoders. An...
Matches 201 - 250 out of 295 < 1 2 3 4 5 6 >