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| Number | Title | Issue Date |
| 8165283 | Advanced ADSL splitter A telecommunication filter arrangement comprising two similar filter cells (T1, S1a, S1b, R1a, R1b; T2, S2a, S2b, R2a, R2b) coupled in casca... | 04/24/2012 |
| 7680266 | System and method for adaptive reduced-rank parameter estimation using an adaptive decimation and interpolation scheme The present invention describes a system and method for general parameter estimation using adaptive processing that provides a performance that significantly exceeds existing reduced-rank schemes using reduced computational resources with greater flexibility. The ad... | 03/16/2010 |
| 7463733 | Interference cancellation equipment An interference cancellation method for use in a communications system in which a plurality of communication paths are arranged to transmit and receive respective analogue signals comprises effecting an initialization phase to calculate, for each path, the interfere... | 12/09/2008 |
| 7369605 | Method and device for injecting a differential current noise signal into a paired wire communication link The present invention relates to a device and method for injecting a noise signal into a wire pair of a communication link. In operation a first current source and a second current source are disposed in series with a node therebetween coupled resistively to a wire ... | 05/06/2008 |
| 7353002 | Measuring a talking quality of a communication link in a network Device and method for measuring a talking quality of a communication link in a communications network (10). The device comprises measurement means (22; 31, 36) connected to the communication link, which are arranged to subject a degraded speech signal ... | 04/01/2008 |
| RE40149 | Method and apparatus for RF common-mode noise rejection in a DSL receiver A receiver for high-speed data communications, which receives a differential signal through a pair of signal lines. The receiver includes a common-mode choke, which has first and second signal windings, which are respectively coupled in series to the pair of signal ... | 03/11/2008 |
| 7315592 | Common mode noise cancellation A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel unwanted differential mode noise that coupled onto the differential s... | 01/01/2008 |
| 7272199 | Adaptive adjustment of time and frequency domain equalizers in communications systems An update mechanism and approach are provided for configuring a communications receiver. According to the approach, a time domain equalizer and a frequency domain equalizer in a communications receiver are dynamically updated based upon performance data that indicat... | 09/18/2007 |
| 7263143 | System and method for statistically directing automatic gain control The present invention is directed to a system and method which statistically determines when regularly occurring interference events of a predictable duration will occur, for example radar pulses and dynamically adjusts an automatic gain control (AGC) for RF data tr... | 08/28/2007 |
| 7260153 | Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels A Multi Input Multi Output (MIMO) Wireless Communication System method and apparatus are proposed whereby in a 2-way wireless communication system with scattering, random and imperfectly estimated propagation channels the ubiquitous and inherent MIMO cross-talk inte... | 08/21/2007 |
| 7254116 | Method and apparatus for transceiver noise reduction in a frame-based communications network A method of and apparatus for noise reduction for a transceiver transmitting frames over a transmission medium in a frame-based communications network. A transceiver transmit path and a transceiver receive path is provided. A blocking switch is located in the transc... | 08/07/2007 |
| 7209522 | Blast MIMO signal processing method and apparatus A technique for generating a demodulation ordering used in receive signal processing operations in a BLAST MIMO receiver that is based on a relative comparison of near-to-far resistance measures among vectors forming the estimated channel transfer function matrix is... | 04/24/2007 |
| 7200223 | Electronic circuit to reduce noise in digital subscriber loop and communications over unshielded twisted pair metallic conductors In order to reduce noise in telecommunications made over unshielded twisted pair (UTP) of metallic conductors an active electronic circuit for a two-to-four wire hybrid circuit reduces common mode signals without recourse to inductive components. The hybrid has a ba... | 04/03/2007 |
| 7180552 | Channel equalizer in digital TV receiver Channel equalizer of VSB modulation system in a digital TV receiver, including a frequency domain equalizer for equalizing a received signal to remove a distorted component from the received signal, a noise removing part for removing noise from the equalized signal,... | 02/20/2007 |
| 7142501 | Method and apparatus for eliminating near-end crosstalk in a digital subscriber line system A method and apparatus for eliminating near-end crosstalk in a communication network are disclosed. Crosstalk generated by communication occurring on a second line is detected on a first line and the phase of the crosstalk detected on the first line is determined. A... | 11/28/2006 |
| 7130416 | Subscriber line interface circuit A subscriber line interface circuit (1′) for supplying line current (IL′) to a two-wire transmission line connected to a load (RL′), comprises a single current amplifier (3′). That single current amplifier (3′) is to be connected with ... | 10/31/2006 |
| 7106833 | Automated system and method for management of digital subscriber lines An automatic system for the provisioning, deployment and management of digital subscriber lines (DSL) in a telephone network uses data on loop composition, electromagnetic interference and crosstalk between lines to optimize the performance and correct problems with... | 09/12/2006 |
| 7095807 | Method for decoding biphase signals A technique of decoding erroneous biphase signals is disclosed comprising the following steps. First, phase and magnitude sample values (ps, bs) are formed, from which a first digital signal (d1) is derived. From this, associated bit combinations (St1,... | 08/22/2006 |
| 7088961 | Circuitry to establish a wireless communication link Circuitry to transmit an analog data signal over a wireless communication link includes a receiver that receives a data signal, an automatic gain control circuit that keeps a peak amplitude of the data signal substantially constant and within a predetermined linear ... | 08/08/2006 |
| 7079773 | Power feeding for an optical transmission system A method and an apparatus for optical transmission line power feed interference compensation for compensating for an electrical interference signal in a power feed conductor (12; 52) and in an associated second conductor (14; 54). The interference sign... | 07/18/2006 |
| 7068758 | Integrated metallic access for high port density DSLAM A multi-services access platform is presented for supporting metallic test access in switching or multiplexing devices such as digital subscriber line access multiplexers (DSLAMs). The multi-services access platform includes a chassis within which a predetermined nu... | 06/27/2006 |
| 7058173 | Multi-stage isolation barrier circuitry and method for connection of a telephony device to a telephone line A multi-stage surge protector/isolation barrier is provided for connection between a telephony device and a telephone network. The multi-stage surge protector/isolation barrier includes a first stage and a second stage. The first stage is operative to limit or clamp... | 06/06/2006 |
| 7035400 | Signaling Techniques in channels with asymmetric powers and capacities An improved system and method for communicating information on a transmission medium is disclosed. The disclosed system and method provide improved communications on the transmission medium in the presence of interference, which may take the form of uncorrelated int... | 04/25/2006 |
| 7002930 | Method of optimal power distribution for communication systems A method of optimally distributing signal power for multiple users over a xDSL or wireless channel considers uses computationally efficient tools to achieve improved crosstalk avoidance. The method chooses between EQPSD and FDS signaling in a fashion that maximizes ... | 02/21/2006 |
| 7003094 | Adaptive interference cancellation for ADSL An ADSL front end is implemented with an adaptive AM interference canceller to cancel out either a carrier signal of an interfering AM radio signal, or a carrier signal and its sidebands of an interfering AM radio signal, from a received ADSL signal. By canceling an... | 02/21/2006 |
| 6999583 | Crosstalk identification for spectrum management in broadband telecommunications systems Crosstalk between subscriber loops used to transmit different broadband services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk, identifying the sources of the... | 02/14/2006 |
| 6978011 | Enhanced low pass filter An ADSL POTS splitter includes an enhanced low pass filter. The enhanced low pass filter includes a first filter capacitor, a first non-isolated inductor, a second non-isolated inductor, a first isolated inductor and a common mode choke. The second non-isolated indu... | 12/20/2005 |
| 6944286 | Ground key detection circuit and method for interference-resistant detection of the activation of a ground key for telephones A grounding key detecting device and method for interference-proof detection of the operation of grounding keys in telephones. A circuit that detects the operation of a grounding key includes a current detection device configured to detect a current flowing when the... | 09/13/2005 |
| 6940973 | Method and apparatus for cancelling common mode noise occurring in communications channels In order to overcome problems when using an adaptive filter for cancellation of common-mode noise in digital subscriber loops, caused by a portion of the differential signal being converted to common mode, which degrades the performance of the filter, a noise cancel... | 09/06/2005 |
| 6925620 | Calculating interconnect swizzling patterns for capacitive and inductive noise cancellation Disclosed herein are swizzling techniques that may provide capacitive and inductive noise cancellation on a set of signal lines. Positive noise due to a capacitive coupling between attacker signal lines and near victim signal lines is, in part, cancelled by negative... | 08/02/2005 |
| 6885746 | Crosstalk identification for spectrum management in broadband telecommunications systems Crosstalk between subscriber loops used to transmit different broadband services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk, identifying the sources of the... | 04/26/2005 |
| 6839429 | Spectral optimization for communication under a peak frequency-domain power constraint System and methods for determining an optimized transmit spectra (spectral distributions of transmission power) for a set of communications channels that experience cross-talk among themselves and for transmitting data on the channels. The transmit spectra are prefe... | 01/04/2005 |
| 6834109 | Method and apparatus for mitigation of disturbers in communication systems The present invention includes a method and system for compensating for cross-talk interference in communication systems. The method includes estimation of the interfering signals. Further, the method includes performing a compensation operation on at least one inte... | 12/21/2004 |
| 6829353 | Mechanism for preventing clipping of pulse metering signals in telephone line card channels A circuit arrangement prevents clipping of pulse metering (teletax) signals in a telephone line card channel that results from the differential impedance between a subscriber line interface circuit (SLIC) and the line at the frequency band of teletax signals. The ci... | 12/07/2004 |
| 6792105 | Current-mode differential active hybrid circuit In at least one embodiment, a current mode differential active hybrid circuit having an H-bridge output driver with a first output resistor coupled across a transmission medium output. Drive circuitry is coupled to the output H-bridge and constructed to supply data ... | 09/14/2004 |
| 6757386 | Apparatus, system, and method for efficient reduction of electromagnetic interference in telecommunications equipment An apparatus for reducing electromagnetic interference on signals being communicated through one or more communications conductors is disclosed. The apparatus of the present invention is preferably situated in a communications circuit having a first area for receivi... | 06/29/2004 |
| 6728368 | Apparatus and method for a highly efficient low power driver for a central office ADSL system An apparatus and method to implement a highly efficient low power line driver. In a first embodiment, the invention provides a method to increase the power efficiency of a line driver. The method includes supplying a digital signal processor output to a first subtra... | 04/27/2004 |
| 6704277 | Testing for digital signaling In an electronic system having logic agents that communicate with each other through one or more signal lines, a method for testing high speed digital signaling on the signal lines is disclosed. The method involves sensing a first crosstalk signal induced... | 03/09/2004 |
| 6650627 | Tone detection in communication networks A communication circuitry for providing effective detection of tones in a communication network. The communication circuitry comprises filtration circuitry, summation circuitry, detection circuitry, and interface circuitry. The filtration circuitry is cou... | 11/18/2003 |
| 6628783 | Filter arrangement applicable to ADSL splitters A low-pass filter arrangement associated a clamping circuit for limiting unwanted transient signals to be transmitted through the filter. Mainly the variations (dI/dt) of the current flowing through the filter are eliminated. The filter may form part of a... | 09/30/2003 |
