Abstract: The techniques described herein permit the application of methods for increasing the performance of a communications system on a medium made up of N conductors (21 to 2N) and a reference plane (4) by means of injecting signals (11 to 1N) inductively in up to N combinations of the conductors, including injection in common mode (11), such that said injected signals can be made to be orthogonal to each other.

Abstract: Which permits the application of methods for increasing the performance of a communications system on a medium made up of N conductors (21 to 2N) and a reference plane (4) by means of injecting signals (11 to 1N) inductively in up to N combinations of the conductors, including injection in common mode (11), such that said injected signals can be made to be orthogonal to each other.

Abstract: Which permits the application of methods for increasing the performance of a communications system on a medium made up of N conductors (51-5N) and a reference plane (6) by means of injecting voltage signals (41-4N) in up to N combinations of the conductors, including injection in common mode, such that said injected signals can be made to be orthogonal to each other.

Abstract: Single-port signal repeater. The repeater is connected in parallel to the communication means (3), on which only one point of access (5) is needed. The repeater (4) comprises an amplifier, a hybrid circuit and a resupply and increases the scope and transmission capacity for communications made on a medium controlled without the disadvantages of the standard repeaters, which have to interrupt the line and need two access points to the channel.

Abstract: It permits switching signals with a peak level equal to the source voltage by means of a transistor, the peak to peak level being double the source. It is characterized by the connection of a transistor (17) to the signal source (10) and a load (19) by means of a series of capacitors (11, 18), resistors (15, 16) and an inductor (12) that form the circuit of the invention, and by the application of two complementary control voltages (13 and 14) in order to control the off and on states of the switch circuit.

Abstract: It permits switching signals with a peak level equal to the source voltage by means of a transistor, the peak to peak level being double the source. It is characterized by the connection of a transistor (17) to the signal source (10) and a load (19) by means of a series of capacitors (11, 18), resistors (15, 16) and an inductor (12) that form the circuit of the invention, and by the application of two complementary control voltages (13 and 14) in order to control the off and on states of the switch circuit.

Abstract: The system enables bidirectional communication between a center and a plurality of users via a power line network and is characterized in that low and high speed communication can be established to provide multiple high-quality services to the users. The system comprises a performing network and frequency time-sharing and/or orthogonal frequency-division multiple access (OFDMA).

Abstract: The invention relates to an overvoltage protection circuit comprising an MOV (Metal Oxide Varistor) voltage limiting device (3) which is disposed in series with a GDT (Gas Discharge Tube) voltage limiting device (4). The invention is characterized in that a resistor (5) is disposed in parallel with the aforementioned GDT device (4), the value of said resistor being such that the voltage supported by the GDT device (4) is less than the holdover voltage thereof. In another embodiment of the invention, a second resistor (6) is disposed in parallel with the MOV device (3) and, together with the above-mentioned resistor (5), forms a resistive divider such that the voltage applied the GDT device (4) under steady-state conditions is less than the holdover voltage of the GDT.

Abstract: The invention relates to an overvoltage protection circuit comprising an MOV (Metal Oxide Varistor) voltage limiting device (3) which is disposed in series with a GDT (Gas Discharge Tube) voltage limiting device (4). The invention is characterized in that a resistor (5) is disposed in parallel with the aforementioned GDT device (4), the value of said resistor being such that the voltage supported by the GDT device (4) is less than the holdover voltage thereof. In another embodiment of the invention, a second resistor (6) is disposed in parallel with the MOV device (3) and, together with the above-mentioned resistor (5), forms a resistive divider such that the voltage applied the GDT device (4) under steady-state conditions is less than the holdover voltage of the GDT.

Abstract: The invention relates to an analog bandpass filter comprising a plurality of LC ladder circuits (1), the response from which is determined by a passband (fpi, fps) and a rejection band (with limits fri and frs). The inventive filter is characterised in that a series of tank circuits (5) is disposed in parallel to the filter charge, the resonance frequencies of said tank circuits coinciding with the lower (fpi) and upper (fps) cut-off frequency of the pass-band of the filter. Furthermore, the filter comprises a control resistor (Rc) which regulates the effect of the tank circuits on the filter. Said structure can be used to compensate the effect of the real limitations of the LC components (1) in order to adjust the response from the analog bandpass filter created with said components to the response from the ideal bandpass filter.

Abstract: The system enables bidirectional communication between a center and a plurality of users via the electric network and is characterized in that low and high speed communication can be established to provide multiple high-quality services to the users. The system comprises means to perform network and frequency time-sharing and/or orthogonal frequency-division multiple access (OFDMA).