294results about "Unbalanced current interference reduction" patented technology

A line state detecting apparatus provided in a balanced transmission system includes, in transmission lines comprising a pair of conductors W1, W2 connected to a transmitting portion 13, current transformers T11, T12 primary sides of which are inserted to respectives thereof in series therewith and secondary sides of which are connected in series to cancel currents or voltages of the two transformer by each other, and a detecting portion 11 for detecting currents or voltages on secondary sides of the current transformers T11, T12. By an output of the detecting portion 11, a difference of currents or voltages of the conductors W1, W2 of the transmission lines is provided and an unbalance component between the conductors W1, W2 is detected.

A noise suppression circuit for a communications channel (10) comprises a hybrid device (11) coupled to the channel for providing a differential output signal corresponding to a received signal. A delay unit (12) delays the differential signal by a suitable amount to allow for the generation and subtraction of a noise estimate. A summing device (13) extracts a digital common mode signal from the channel, and a noise estimation unit (16) provides a common mode noise estimate signal in dependence upon a history of the common mode signal over a predetermined period of time and over a plurality of frequency bands. The common mode noise estimate signal is combined subtractively (19) with the delayed differential signal to cancel common mode noise elements of the delayed differential signal. The noise estimation unit may comprise an analysis filter bank (20) for producing a plurality of subband signals (S1-SM), each at a different one of a plurality of different frequencies, a plurality of noise detection circuits (231-23M), each for processing a respective one of the plurality of subband signals to provide a component of the common mode noise estimate signal, and a synthesis filter bank (24) for processing the common mode noise signal components to provide the noise estimate signal.

A communication system and method is provided for handling emergency situations wherein complex public safety radio systems can be used to directly communicate with normally incompatible radio systems used by organizations such as schools, hospital, and other facilities. The system includes a radio communication bridge that is selectively activated by emergency personnel to contact selected organizations. The bridge is activated via a TCP/IP command sent from an organization having activation privileges to the selected communication endpoints. Computer software or firmware installed at various communication endpoints, emergency responder locations, and at an emergency call center is used to facilitate functionality of the system to include emergency notifications, dissemination of information associated with a particular emergency, and the status of the system to include activation and deactivation of the radio bridge.

A multi-channel signal processing system includes a filter unit arranged at a signal transmitting end and a feedback unit arranged at a signal receiving end. The filter unit includes a signal synthesis unit and a filter, where the filter is adapted to filter crosstalk source signals of signals to be transmitted and perform subsequent filtering in accordance with received feedback information; the signal synthesis unit is adapted to receive the signals to be transmitted which are input and the crosstalk source signals filtered by the filter, and synthesize the signals to be transmitted and the crosstalk source signals; and the feedback unit is adapted to make a feedback to the filter in accordance with the received signals to be transmitted.

The invention relates to a receiving circuit for transmission through interconnections used for sending a plurality of electrical signals.

Each of the output signals of the receiving circuit produced by the receiving circuit of the invention is delivered by an output of a combining circuit having 4 inputs and 4 outputs. Each signal terminal of the receiving circuit is connected to a first input terminal of a differential circuit, the differential circuit also having a second input terminal and a single output terminal. The common terminal of the receiving circuit is connected to the second input terminal of each of the differential circuits. Each input of the combining circuit is coupled to the output terminal of one of the differential circuits. Each of the output signals of the receiving circuit is a linear combination of the voltages between one of the signal terminals and the common terminal.

A magnetic package for a communication system is disclosed the package comprises a plurality of transformers, wherein each transformer comprises a differential transformer. Each differential transformer comprises at least 2 sets of three pins. Each transformer is coupled to a twisted pair channel and a transceiver. The magnetic package includes at least one common mode transformer coupled to at least one of the transformers, wherein the at least one common mode transformer includes at least three pins. The at least three pins for the at least one common mode transformer are in a position relative to the other pins such that the package size is minimized.

A balanced transmission signal Tx (t) (voltage e, −e) is applied to a transmission line (L1, L2), a suppression signal (e_c) is generated from a common mode suppression signal source (e_c), and the suppression signal (e_c) is superposed on respectives of balanced transmission signals via adders (15a, 15b). By pertinently controlling a level of the suppression signal (e_c), voltage levels and phases of respectives of the transmission signals transmitted to the transmission lines (L1, L2) are controlled.

In various embodiments a traffic class manager is a resource within a virtualized computer systems trusted entity (i.e. a hypervisor, trusted partition, etc.) which maps requirements from a platform management and associated network capabilities onto an SR-IOV adapter in order to appropriately allocate SR-IOV adapter and network resources to the virtualized computer partitions. In various embodiments the traffic class manager defines network traffic classes that meet the objectives of a platform administrator based on the capabilities of the SR-IOV adapter and the network attached to the adapter ports. Once the traffic classes are defined, in various embodiments, the traffic class manager enforces the assignment of a traffic class to a virtual interface queue pair within a partition.

A system for canceling impulse noise comprises an adaptive impulse canceler and a combiner. The adaptive impulse canceler is configured to receive a common mode component of a received signal and to detect a noise impulse in the common mode component. The impulse canceler is further configured to provide, based on the noise impulse in the common mode component, an impulse noise estimation for a differential mode component of the received signal. The combiner is configured to receive the differential mode component and the impulse noise estimation and to subtract the impulse noise estimation from the differential mode component.

A method and apparatus that minimizes saturation caused by power transfer in a communication system transformer, such as a transformer found in a Power-over-Ethernet system. A magnetic flux imbalance causing saturation in the transformer is detected. A compensation current is injected into a winding to minimize the magnetic flux imbalance and saturation.

Disclosed herein is a clock supplying apparatus for supplying a clock to a digital circuit, including: a differential clock driver; a first clock line along which a first clock of a positive phase from the clock driver propagates; a second clock line along which a second clock of a reverse phase from the clock driver propagates; and a parallel resonance circuit of an inductor and a capacitor. The inductor of the parallel resonance circuit is connected at a first end to the first clock line and at a second end to the second clock line. The capacitor of the parallel resonance circuit is connected at a first electrode to the first clock line and at a second electrode to the second clock line.

Cable assembly is provided that includes a communication cable having first and second insulated wires. Each of the first and second insulated wires has a signal conductor and an insulation layer that surrounds the signal conductor. The cable assembly also includes a circuit carrier that is coupled to the communication cable and has first and second signal pathways. Each of the first and second signal pathways includes a leading conductive surface and a trailing conductive surface that are separated from each other. The signal conductors of the first and second insulated wires are coupled to the trailing conductive surfaces of the first and second signal pathways, respectively. Each of the first and second signal pathways includes a corresponding signal-control component that electrically couples the separated leading and trailing conductive surfaces.

One aspect of the present invention is directed to a circuit that includes an amplifier circuit disposed between an isolation link and a Schmitt trigger circuit to amplify a differential signal communicated over the isolation link and supply the amplified signal to the Schmitt trigger circuit. In turn, the Schmitt trigger circuit is coupled to the amplifier circuit to receive the differential signal and to supply a differential output signal corresponding to the differential signal communicated over the isolation link.

The termination circuit for use in a transmission line to transmit a differential signal includes a first series circuit of a resistive element and an inductive element connected between one of two signal wires of the transmission line and a reference potential, and a second series circuit of a resistive element and an inductive element connected between the other of the signal wires and the reference potential. The inductive elements of the first and second series circuits are magnetically coupled such that they generate magnetic fields having such directions as to reinforce each other when a common-mode signal flows along the transmission line, and generate magnetic fields having such directions as to weaken each other when a differential-mode signal flows along the transmission line.