Astech, Inc.

Other

William M Brown

Robert T Dunn

John M Ruddy

James R Lindquist

In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and an extension telephone over the AC electric power line available at a telephone subscriber's premises, that includes a main station for processing signals between the subscriber's telephone line and power lines and two or more extension telephones of the system that plug into the power line, means that provides for two or more of the system telephones to communicate without going on the telephone line (Intercom), even while another system telephone is engaged in an outside telephone call and means are further provided for all telephones of the system to conference in Intercom.

Power line carrier multi telephone extension system for full duplex

In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and one or more extension telephones over the AC electric power line available at a telephone subscriber's premises, that includes a main station for processing signals between the subscriber's telephone line and power lines and one or more extension telephones of the system that plugs into the power line, all of which can place calls to the telephone line, answer calls from the telephone line and conference together in full duplex communication, means at the extension telephones for initiating a telephone line hold signal that is transmitted over the power line to the main station where the hold signal is detected and initiates connecting a hold impedance across the telephone line.

Power line carrier telephone extension system for full duplex

A power line telephone extension system for carrying electrical signals between a subscriber's telephone line of a conventional telephone communication system and the subscriber's remote transmit-receiver device, (such as a conventional extension telephone), over the AC electric power wires available to the subscriber which includes: master linking circuits for processing signals between the subscriber's telephone line and the AC power wires; extension linking circuits for processing signals between the AC power wires and the subscriber's remote transmit-receive device, such as a conventional extension telephone; and a directional coupler circuit electrically coupling the remote transmit-receive device and the telephone line. The extension system is quite suitable for use with the presently available, well known, conventional extension telephone that plugs in by the plug (modular or 4 prong) provided therewith, to the directional coupler. Thus, the extension phone can then be used along with the extension linking circuits at any location at the subscriber's premises where there is access to the AC power wires.

Telephone extension system utilizing power line carrier signals

In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and an extension telephone over the AC electric power line available at a telephone subscriber's premises, that includes a main station for processing signals between the subscriber's telephone line and power lines and an extension telephone of the system that plugs into the power line, means that provides for a plurality of such extension telephones all of which can place calls to the telephone line, answer calls from the telephone line and conference together in full duplex communication.

A remote transmitting or receiving device (T/R device) communicates with a conventional subscriber telephone through available AC power wires which carry signals that may be modulations of RF carrier frequencies and which are coupled to the power wires. For example, an incoming telephone call includes signals that are detected and modulate a master RF carrier frequency which is coupled to the AC power wires at the telephone line location and these signals are coupled from the AC power wires at a remote R device location, and, demodulated and used to control an electrical appliance, motor, pump, etc. The remote T device which may be, for example, a fire detector produces signals which modulate a remote RF carrier frequency which is coupled to the AC power wires at the remote location and this modulated carrier is coupled from the AC power wires and demodulated at the telephone line location to control or initiate signals in suitable form for transmission over the telephone line. Thus, telephone calls to the subscriber's telephone line can be received at the remote location to turn on an electrical device at that location; or signals originating at the remote location initiate a telephone call and message from the transcriber's telephone line.

Remote signalling to a telephone line utilizing power line carrier

An extension telephone system communicates with a conventional subscriber telephone line where the subscriber's line telephone is located, through available AC power wires which carry signals that may be modulations of RF carrier frequencies and which are coupled to the power wires. Incoming telephone line signals are detected and modulate a first RF carrier frequency which is coupled to the AC power wires at the line telephone location and these signals are coupled from the AC power wires at an extension telephone location, and, demodulated and fed to an extension telephone which is energized by DC power derived from the AC power wires at the extension location. The extension telephone produces extension telephone signals which modulate a second RF carrier frequency which is coupled to the AC power wires at the extension location and this modulated carrier is coupled from the AC power wires and demodulated at the line telephone to produce the extension telephone signals in suitable form for applying to the telephone line. Thus, telephone calls to the subscriber's line telephone can be received by the extension telephone and calls to the telephone extension telephones can be connected to this system wherever there is access to the same AC power wires.

Growing community of inventors

Acton, MA, United States of America

William M Brown