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| Number | Title | Issue Date |
| 8116449 | Cost-effective, multichannel digital logger A digital logger system includes a multichannel interface circuit that: 1. concurrently and continuously-receives audio telecommunication signals for at least two telephone calls from a digital hybrid telephone line; and ... | 02/14/2012 |
| 7539301 | Cost-effective multichannel digital logger A digital logger system includes a multichannel interface circuit that: 1. concurrently and continuously receives audio telecommunication signals for at least two telephone calls; and 2. continuously transmits line... | 05/26/2009 |
| 7450715 | Transceiver for bidirectional frequency division multiplexed transmission The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The... | 11/11/2008 |
| 7440568 | Bipolar pulse forming line A bipolar pulse forming transmission line module for linear induction accelerators having first, second, third, fourth, and fifth planar conductors which form an interleaved stack with dielectric layers between the conductors. Each conductor has a first end, and a s... | 10/21/2008 |
| 7408993 | Digital communication extender system and method An extender circuit for handling a communication signal transmitted over a transmission line includes a voltage clamp and a current booster circuit. The voltage clamp is connected to a receive end of the transmission line and is operable to clamp a reflection signal... | 08/05/2008 |
| 7294996 | Characteristic evaluating system and characteristic evaluating method The characteristic evaluating system of the present invention includes: a cable-driving transmitter transmitting a signal to one end of a cable to be measured; a load connected to the other end of the cable; a probe detecting a common mode current of the cable; a re... | 11/13/2007 |
| 7236587 | Systems and methods for determining critical circuit diversity According to the invention, systems and methods are provided for analyzing the diversity of a set of critical telecommunication circuits. For example, according to one embodiment of the invention, a method is provided for analyzing the diversity of critical telecomm... | 06/26/2007 |
| 7164888 | Systems and methods for analyzing critical circuits and associated telecommunication resources The invention provides systems and methods for analyzing critical circuits and telecommunication resources. For example, in accordance with one embodiment of the invention, a computer-implemented method is provided for identifying critical telecommunication resource... | 01/16/2007 |
| 7132613 | Methods, systems, and terminals for load coil switching A method for constructing a transmission line unit such that load coils can be selectively connected to a transmission line includes providing a transmission line section having a transmission line and a plurality of load coils electrically connected thereto, and co... | 11/07/2006 |
| 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 |
| 7079646 | ADSL receiver high pass filter architecture An ADSL receiver HPF architecture 300 that reduces the number of Op Amps below that required for known ADSL receiver HPFs. The ADSL receiver HPF 300 is implemented as an active RC filter to provide a single fifth-order Elliptic filter instead of the mo... | 07/18/2006 |
| 7064661 | System for controlling and determining location and security model A control and detection system for control of an object connected to the system, and for detection of object location in case of disappearance, theft or shifting of object, whereby the system has communication from each object at least to one data receiving device (... | 06/20/2006 |
| 7054391 | Receiver based saturation estimator A processor-implemented method of estimating the saturation level of a transmitter from a transmitted communication signal received from the transmitter comprises generating a received data signal from the transmitted communication signal received from the transmitt... | 05/30/2006 |
| 7023908 | DSL transmission system with far-end crosstalk compensation The invention relates to a far-end crosstalk canceling circuit for a digital subscriber line transmission system, the transmission system including a plurality of line termination modems transmitting discrete multitone symbols Si to corresponding network termination... | 04/04/2006 |
| 6980592 | Digital adaptive equalizer for T1/E1 long haul transceiver The present invention relates to the implementation of a digital adaptive equalizer for a T1/E1 long haul transceiver which is capable of adapting to a wide range of cable types, cable lengths, and/or other data transmission impairments, particularly when the transm... | 12/27/2005 |
| 6978015 | Method and apparatus for cooperative diagnosis of impairments and mitigation of disturbers in communication systems A method that sends upstream a collection of data samples measured from a DSL line. ... | 12/20/2005 |
| 6970560 | Method and apparatus for impairment diagnosis in communication systems Events that occur in a number of in domain communication channels where each channel is used by a communication service, are detected. A Bayesian Belief Network (BBN) defines a probabilistic cause-effect relationship between each cause and each effect on a victim ch... | 11/29/2005 |
| 6920183 | Crosstalk equalization for input-output driver circuits Embodiments of the present invention mitigate crosstalk by equalizing transmit signals in a data dependent fashion. ... | 07/19/2005 |
| 6904145 | ADSL front-end in a low voltage process that accommodates large line voltages The asymmetric digital subscriber line receive channel includes: first and second external resistors 20 and 22 coupled to a telephone line 24 and 26; a coarse programmable gain amplifier CPGA formed in a low voltage process having inputs ... | 06/07/2005 |
| 6901143 | Voice switching system capable of improving a quality of conversation In a voice switch, a received voice signal and a transmitted voice signal are inputted to a receiving side control section, the receiving side control section thereby produces a signal for controlling an amount of attenuation in a receiving side attenuation section.... | 05/31/2005 |
| 6870901 | Design and architecture of an impairment diagnosis system for use in communications systems A method and apparatus are disclosed. The method includes one or more of the following: compiling statistical models of physical layers of a communications system; creating a priori distributions of cross-talk transfer functions; storing the models and the a priori ... | 03/22/2005 |
| 6850618 | Central office interface techniques for digital subscriber lines A splitterless interface between a digital subscriber line (DSL) and the central office equipment that can receive and isolate the low frequency voice data and high frequency digital data from a telephone line. This interface can also mix and transmit low frequency ... | 02/01/2005 |
| 6836509 | Dsl- compatible pots line card An improved plain old telephone service (POTS) line card that may be directly connected to a customer line that is also connected to a digital subscriber line access module. A second order filter is added to the front end of the POTS line card in order to attenuate ... | 12/28/2004 |
| 6785326 | Method and apparatus for detecting and compensating digital losses in a communications network The present invention relates generally to impairment detection and compensation in a communications network. One embodiment includes a method for generating an adaptive Digital Impairment Learning (DIL) sequence for use in a training mode which assists in resolving... | 08/31/2004 |
| 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 |
| 6742170 | Repeatable 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... | 05/25/2004 |
| 6728366 | Signal level adjustment arrangement For signal level adjustment of a multitone signal received over a transmission line (1) during a training sequence in a DSL system, a programmable high-pass filter (2) is connected to the transmission line (1). A programmable gain control unit (... | 04/27/2004 |
| 6694013 | Filter arrangement and method for telecommunication device The present invention relates to a filter arrangement (8C) and a method for frequency filtering and impedance conversion. The invention makes it possible to perform frequency filtering and impedance conversion using fewer inductors than what is required u... | 02/17/2004 |
| 6546100 | Load coil device A load coil device for a twisted pair telephone line is disclosed. The device is for compensating distributed stray capacitance in telephone lines that are longer the 18,000 feet. Typically, a load coil device would be inserted in the line every 6,000 fee... | 04/08/2003 |
| 6496577 | Signal transmission for transmitting message to destination A signal transmission system includes a plurality of long distance signaling transfer point (L-STP) stations, each of which includes a plurality of regional signaling transfer point (R-STP) stations, each of which includes a plurality of signaling end poi... | 12/17/2002 |
| 6407609 | Distortion precompensator and method of compensating for distortion in a transmission medium The present invention provides a distortion precompensator and method of compensating for distortion in a transmission medium and a transmitter employing the same. In one embodiment, the distortion precompensator includes a controller, associated with a t... | 06/18/2002 |
| 6400822 | Linear, optical coupled line impedance circuit A system and method for matching a device to a transmission line are disclosed. A matching circuit having optically coupled devices is biased so that harmonics of a reference signal, such as a dial tone, are eliminated. Suppression of the reference signal... | 06/04/2002 |
| 6393110 | Methods and apparatus for terminating a line and supporting the asymmetric digital subscriber line protocol A digital access arrangement for (i) isolating downstream components from twisted pair copper wire and (ii) separating upstream and downstream communications channels. The line isolation is performed with relatively small, lightweight components, such as ... | 05/21/2002 |
| 6295343 | Method and apparatus for combining voice line card and xDSL line card functions An integrated line card for providing an analog termination for both POTS and xDSL signals that present the appropriate impedances at xDSL frequencies for the xDSL signals and appropriate impedances at POTS frequencies for POTS signals. The line card comp... | 09/25/2001 |
| 6259788 | Technique for balancing loads in a communication network In a telephone network, different telephones are connected to a telephone line in a parallel manner. When two or more of the telephones are in use and conduct electricity, known as an "off-hook" condition, they are oftentimes provided with varying amounts... | 07/10/2001 |
| 6141377 | Method and apparatus for voice frequency noise reduction in splitterless ADSL An ADSL modem provides compensation for a nonlinear telephone impedance by predistorting transmit signals such that the voltage across the nonlinear impedance is correct independent of the impedance. Correcting the voltage across the nonlinear impedance r... | 10/31/2000 |
| 6111949 | Method of rapid automatic hybrid balancing The present invention provides a two-wire line conditioning apparatus having an improved calibration and cancellation circuit and provides an improved calibration method using a multitone calibration signal. The apparatus automatically adjusts an electron... | 08/29/2000 |
| 6111935 | Adaptive expansion table in a digital telephone receiver A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote party (90). The send equipment (40) comprises an A-law map (1... | 08/29/2000 |
| 6097262 | Transmission line impedance matching apparatus A transmission line impedance matching apparatus is disclosed that limits longitudinal signals and matches the longitudinal characteristic impedance between two conductors and comprises a common mode choke and an impedance matching device. The common mode... | 08/01/2000 |
| 5953412 | Method and apparatus for controlling line conditioner equalizer The present invention provides a two-wire line conditioning apparatus having an improved calibration and cancellation circuit and provides an improved calibration method using a multitone calibration signal. The apparatus automatically adjusts an electron... | 09/14/1999 |
