Power line communications terminal and interface circuit associated therewith
First Claim
1. A power line interface circuit coupled between a power line and a communications terminal for providing high bridging impedance to communication signals present on said power line without impeding substantially the transmission and reception communication signals of said terminal, said interface circuit comprising:
- means for coupling communication signals between said power line and said communications terminal;
means for measuring the communication signals present on said power line from said coupling means; and
means governed by said measured communication signals to generate matched signals, representative of said measured communication signals, which are applied to said coupling means to effect high bridging impedance to said communication signals present on said power line without impeding substantially the transmission and reception communication signals of said terminal.
3 Assignments
0 Petitions
Accused Products
Abstract
A communications terminal for transmitting and receiving communication signals over a power line communications network and including an interface circuit for coupling the terminal to the power line of the network is disclosed. One embodiment of the network includes a transformer for coupling communication signals between the power line and terminal. The coupled communication signals are measured from the secondary of the transformer and used to govern an amplifier circuit which generates matched signals, representative of the measured communication signals. The matched signals are inverted in polarity at the output stage of the amplifier and applied to the secondary winding of the transformer to cancel substantially the electromagnetically coupled communication signals from the power line, thereby providing a high bridging impedance to the power line communication signals without impeding substantially the coupling of the terminal'"'"'s own communication signals.
199 Citations
10 Claims
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1. A power line interface circuit coupled between a power line and a communications terminal for providing high bridging impedance to communication signals present on said power line without impeding substantially the transmission and reception communication signals of said terminal, said interface circuit comprising:
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means for coupling communication signals between said power line and said communications terminal; means for measuring the communication signals present on said power line from said coupling means; and means governed by said measured communication signals to generate matched signals, representative of said measured communication signals, which are applied to said coupling means to effect high bridging impedance to said communication signals present on said power line without impeding substantially the transmission and reception communication signals of said terminal. - View Dependent Claims (2, 3, 4, 5)
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6. A communications terminal for transmitting and receiving communication signals over a power line communications network, said terminal including a power line interface circuit for coupling said terminal to a power line of said network, said interface circuit comprising:
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means for coupling communication signals between said power line and said communications terminal; means for measuring the communication signals present on said power line from said coupling means; and means governed by said measured communication signals to generate matched signals, representative of said measured communication signals, which are applied to said coupling means to effect high bridging impedance to said communication signals present on said power line without impeding substantially the transmission and reception communication signals of said terminal. - View Dependent Claims (7, 8, 9, 10)
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Specification