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| Number | Title | Issue Date |
| 7386119 | Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA) An improved data access arrangement device for use in full-duplex two-wire communication systems having a transmission impedance characteristic. The DAA includes a transmit amplifier and a receive amplifier adapted for connection to a two-wire line, a codec connecte... | 06/10/2008 |
| 7324587 | Communication apparatus A communication apparatus comprising a semiconductor DAA, a system unit and a modem is provided. The DAA has a line control unit connected to a communication line network and a serial IF unit connected to the line control unit via an isolating circuit, and controls ... | 01/29/2008 |
| 7248035 | Automatic test equipment pin channel with T-coil compensation A passive matching network is connected to an input/output line for an automatic test equipment drive channel to compensate for capacitances associated with a receiver circuit connected to the line, and also an optional current-mode driver circuit. The matching circ... | 07/24/2007 |
| 7110528 | Amplifier for unshielded twisted pair wire signals An analog electronic circuit is placed between the central office of a telecommunications provider and the customer premises equipment of a digital subscriber line system which uses unshielded twisted pair wires (“UTP”). The electronic circuit separates the down... | 09/19/2006 |
| 7027589 | Single-ended loop test circuitry in a central office DSL modem A central office modem (50) that includes the capability of single-ended loop testing (SELT) is disclosed. The modem (50) includes a digital signal processor (54), a codec (56), line driver and receiver circuitry (58), and a hybrid... | 04/11/2006 |
| 7010025 | Circuit and method for an improved front end in duplex signal communication systems An improved analog front end and methods for increasing the power efficiency of duplex signals on a transmission line are disclosed. The improved analog front end bifurcates a hybrid into a fixed portion and an adaptive portion. The adaptive portion combines a biqua... | 03/07/2006 |
| 6980819 | Radio communication system, and apparatus, method, and computer program for said radio communication system A communication system that permits the coexistence of a plurality of ultrawide band (UWB) radio communication networks that use different signal systems is achieved by using the same beacon signal and specifying the format of part of the control command among a plu... | 12/27/2005 |
| 6970515 | Line driver for asymmetric digital subscriber line system A line driver couples a data transceiver to a transmission line having a load impedance Z via a transformer with a turns ratio of 1:n, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range different fr... | 11/29/2005 |
| 6965578 | Echo canceling method and apparatus for digital data communication system An improved echo cancellation technique may be employed by a server modem in a digital communication system. The disclosed echo cancellation technique provides not only for the cancellation of echo signals imparted on the received signals of a modem but also for the... | 11/15/2005 |
| 6961421 | Echo analysis for identification of hybrid induced echo in a communication link Echo return loss is analyzed to determine if the near end connection of a communication link has hybrid induced echo. If the echo return loss is above a threshold value for a predetermined period, than no echo or very little echo is present. The lack of echo is trea... | 11/01/2005 |
| 6944250 | Variable rate modulator Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequency may be... | 09/13/2005 |
| 6934383 | Apparatus for reducing echoes and noises in telephone An apparatus for reducing echoes which are generated due to signals induced to a handset connector in a telephone, includes a round-type handset connector cord arranged into a round configuration having a certain arrangement of the speech transmitting and receiving ... | 08/23/2005 |
| 6801621 | Circuit and method for active termination of a transmission line interface An improved line driver-hybrid and method for increasing the power efficiency, signal accuracy, and stability of a transmit signal on a transmission line are disclosed. The improved line driver-hybrid uses a negative feedback control loop, thereby enhancing operatio... | 10/05/2004 |
| 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 |
| 6751202 | Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA) An improved data access arrangement device for use in full-duplex two-wire communication systems having a transmission impedance characteristic. The DAA includes a transmit amplifier and a receive amplifier adapted for connection to a two-wire line, a codec connecte... | 06/15/2004 |
| 6731752 | Method and circuit for echo-cancellation in two-way communications A hybrid circuit models a plurality of attributes of a communication system including a subscriber line coupled to a line interface circuit. The plurality of attributes includes subscriber line impedance, and impedance of a coupling transformer. The attributes are b... | 05/04/2004 |
| 6421376 | Methods of using digital modem identification information Improved data communication for modems having digital identification information capability. More particularly, the invention is based on the realization that the ability to signal connection type information between modems permits new uses of existing an... | 07/16/2002 |
| 6205218 | Extended feedback circuit for impedance matching and voltage isolation A network interface circuit employs an extended feedback circuit topology for impedance matching across a high voltage boundary between a line side portion and low voltage portion of a network. The network interface circuit includes an operational amplifi... | 03/20/2001 |
| 6185293 | Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system A signal matching apparatus for exchanging signals between a digital switching system and a two-wire long distance subscriber line signal switching system comprises a first PCM equipment for converting a 4-wire E1 signal of the digital switching system in... | 02/06/2001 |
| 6154536 | Order wire accommodation system for interoffice communications An order wire accommodation system comprises four interface boxes each of which has the same order wire interface section as the others. The order wire interface section has a circuit which digitally adds order wire signals of the transmission lines from ... | 11/28/2000 |
| 5974137 | AGC amplifier for two-wire line conditioner 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 output is monitored by an AGC circuit which... | 10/26/1999 |
| 5963638 | Adjustable hybrid having improved biasing configuration 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... | 10/05/1999 |
| 5912964 | Adaptive telephone handset interface An adaptive handset interface for interfacing a two-wire analog telephone instrument to a telephone set having a base unit connected to a handset via a four-wire handset cable. The interface is suitable for use with a variety of telephone sets produced by... | 06/15/1999 |
| 5887050 | Repeater apparatus having isolation circuit A repeater apparatus includes a first trunk circuit for receiving and sending data input from and to a first section of the communication link and a second trunk circuit for receiving and sending data input from and to a second section of the communicatio... | 03/23/1999 |
| 5757906 | Method of canceling echoes and echo canceler An artificial echo signal generator generates an artificial echo signal from received voice signal data stored in a first data memory and a presumed impulse response outputted from a tap coefficient updater. The artificial echo signal is subtracted from a... | 05/26/1998 |
| 5721772 | Subband acoustic echo canceller In a subband acoustic echo canceller, FG/BG filters are provided in M ones of N subbands into which the received signal is divided, and adaptive filters are provided in the other remaining subbands. In the respective FG/BG filters, during the detection of... | 02/24/1998 |
| 5652712 | Method and apparatus for calibration of digital test equipment A processor controlled test set for testing special service circuits of a telecommunication system. A microprocessor controls the overall operation of the test set, while a digital signal processor provides high speed timing signals to the various test ci... | 07/29/1997 |
| 5602912 | Telephone hybrid circuit A method and apparatus for providing a telephone hybrid function is provided. The present invention maximizes dynamic range while providing a receive signal without interference from a transmit signal. The present invention also provides single-ended to d... | 02/11/1997 |
| 5546421 | Self compensating spread-spectrum hybrid A communications station (10) couples a bidirectional input-output signal path (16') to two unidirectional signal paths; a transmit signal path (12') and a receive signal path (14'), using a controllable hybrid (20). A feedback control system in the stati... | 08/13/1996 |
| 5541990 | Compensated hybrid A hybrid circuit for coupling a modem to an external telephone line substantially compensates for and thereby cancels reflected echo. The hybrid includes a transformer coupled between the telephone line and the modem transceiver, which includes a transmit... | 07/30/1996 |
| 5506900 | Temperature compensation for trans-hybrid loss in a miniaturized data access arrangement Method and apparatus for temperature compensation of transhybrid loss in a data access arrangement (DAA) is provided. A thermal compensation device is situated in proximity to a thermally sensitive device. If devices which dissipate substantial power caus... | 04/09/1996 |
| 5504811 | Enhanced line powered amplifier An enhanced amplifier for interconnecting a two-wire, bidirectional cable side transmission path and a two-wire bidirectional equipment side transmission path in a communication system includes a first splitter and a second splitter. The first splitter is... | 04/02/1996 |
| 5500892 | Echo canceller Analog signals representing individual digital values (+3, +1, -1, -3) of data pass through a telephone line to a receiver. These signals may first be provided in a pseudo random sequence. A linear echo canceller and a first adder at the receiver simultan... | 03/19/1996 |
| 5497417 | Switching device for transmitting telecommunication signals A switching device is presented for the transmission of telecommunication signals between a telephone network exchange and at least one subscriber connected thereto, where the exchange is able to transmit metering pulses, in addition to the voice signal. ... | 03/05/1996 |
| 5479504 | Low voltage balanced hybrid circuit with operational amplifiers A hybrid circuit applies a data sending signal and an inverted data sending signal to the ends of a primary coil, so that the primary coil receives voltages based on the sum of the voltages of the two signals. As a result, the gains of internal amplifiers... | 12/26/1995 |
| 5461661 | Line disconnection detection circuit for echo-cancelling transceivers A circuit for comparing transmitted and received data frames containing appropriate stuff symbols to detect when a channel is disconnected. Transmit data symbols consisting of frames of user data, each with a constant number of symbols, are separated by a... | 10/24/1995 |
| 5457743 | Metallic channel unit network A channel unit network for interconnecting a two-wire, bidirectional signal transmitting means with a four-wire digital transmitting means in a communication system to create a precision bidirectional simulated two-wire cable pair over a transmission medi... | 10/10/1995 |
| 5422948 | Subscriber line interface for improving the frequency characteristics of the transmitted and received signals A subscriber line interface circuit, coupled between a telephone unit terminal and a switching system, includes a coding and decoding circuit for controlling analog voltages inputted thereinto and outputted therefrom, using a direct current bias voltage, ... | 06/06/1995 |
| 5414766 | Process and device for adaptive digital cancellation of the echo generated in time-varying telephone connections An echo cancellation device usable in telephone connections affected by phase-roll is described. The canceller calculates the echo path propagation delay and produces an estimate of the echo signal by digitally filtering the signal originated by the far-e... | 05/09/1995 |
| 5402485 | Two-wire termination impedance generation circuit of subscriber circuit A two-wire termination impedance generation circuit of a subscriber circuit including differential amplifiers, which is provided with a network circuit including capacitors and resistors, an input point, and current sources, the capacitor being comprised ... | 03/28/1995 |
