Class 379/402 - Hybrid circuit

Subclass of Class 379 - Telephonic communications
Definition: Subject matter including a two-wire to four-wire converter.
No. of patents: 270
Last issue date: 02/03/2009

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Number	Title	Issue Date
7486788	Transceiver with integrated hybrid circuit A transceiver for a transmission and reception signal which can be transmitted via a signal line having a particular line impedance (ZLINE), having a line driver (6) for driving a transmission signal via the signal line and having an analog echo ca...	02/03/2009
7460662	Isolation of transmit and receive signals in full-duplex communication systems A method and apparatus for isolating transmit and receive signals in a communication system utilizing a common channel for both incoming and outgoing signals. In one embodiment a tuned hybrid or isolation circuit is provided with a high-frequency pre-emphasis respon...	12/02/2008
7397914	Multiple path hybrid for subscriber line services A hybrid with a plurality of selectable hybrid input paths each having an associated hybrid input path filter is provided. The hybrid includes a plurality of selectable receive paths each having an associated receive path filter. The hybrid further includes a hybrid...	07/08/2008
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
7362841	Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable DC termination impedance A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC t...	04/22/2008
7352776	Line terminator unit for a subscriber line The invention relates to a line terminating device for a subscriber line which transmits and receives broadband signals via a single subscriber line, a broadband signal being composed of a broadband or narrowband audio-frequency data signal and a broadband higher-fr...	04/01/2008
7330545	Dual transformer hybrid system and method A hybrid matching system is disclosed for use with a transmitter and receiver. The hybrid matching system includes a pair of transmitter output nodes for providing a differential transmitter signal for transmission, a pair of receiver input nodes for receiving a dif...	02/12/2008
7327298	Gigabit ethernet line driver and hybrid architecture A gigabit ethernet line driver includes a transmitter having both transmitter and active hybrid outputs. The transmitter consists of a plurality of transmitter clusters each connected to both the transmitter and active hybrid outputs. Each transmitter cluster includ...	02/05/2008
7274732	Echo cancellation in communication systems with asymmetric data rates A communication device (e.g., a modem) is disclosed as including logic that processes a transmit signal before providing a signal to an echo canceler. The processing may include low pass filtering and decimation of the transmit signal. The low pass filter's cut-off ...	09/25/2007
7260152	Method and device for injecting a 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 differential mode noise signal is received at a first and a second input port, which are connected via a first and a second res...	08/21/2007
7260142	Dynamic hybrid switching in a wireline modem A method for dynamically switching hybrids during modem initialization to maximize channel capacity and performance includes the steps of evaluating each hybrid in the modem according to a cost function dependent on the quiet receive noise floor and the transmit sig...	08/21/2007
7254229	Method and apparatus for an active impedance feedback A method and apparatus is provided for performing an active impedance feedback. A signal is received. An active feedback synthesis is performed based upon the signal. Performing the active feedback synthesis includes using an active feedback network for conditioning...	08/07/2007
7251213	Method for remote measurement of echo path delay A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can b...	07/31/2007
7246022	Initiation of differential link retraining upon temperature excursion A method includes detecting a change in temperature in an integrated circuit that is coupled to a differential communication link, and responding to the detected change in temperature by initiating a retraining process for the differential communication link. ...	07/17/2007
7240233	Hybrid parallel/serial bus interface A hybrid serial/parallel bus interface has a data block demultiplexing device. The data block demultiplexing device has an input configured to receive a data block and demultiplexes the data block into a plurality of nibbles. For each nibble, a parallel to serial co...	07/03/2007
7236519	Transceiving filter and communication device First and second transmission paths are provided between a first port to which an antenna is connected and a second port to which a transceiving circuit is connected. First to fourth reception filters, an amplifier circuit, and first to fourth hybrid circuits are pr...	06/26/2007
7233649	Faster modem method and apparatus A faster modem apparatus communicates with customer premise equipment according to a variety of communication protocols. The faster modem apparatus communicates with customer premise equipment comprising an analog soft-modem comprising a codec. A method utilizes an ...	06/19/2007
7221754	Switchable hybrid design for asymmetric digital subscriber line A method is provided for accomplishing asymmetric digital subscriber loop classification and the design of passive hybrid networks for each of the classes. The resulting hybrids are suitable for implementation in a switchable hybrid architecture. ...	05/22/2007
7215764	Current sensing echo cancellation device A passive echo cancellation circuit for reducing echoes on a subscriber line includes an output driver adapted to drive a downstream signal on the subscriber line. First sensing circuitry is coupled to the output driver and adapted to sense a current on the subscrib...	05/08/2007
7215762	Method of selecting impedance setting for loop start trunk line A method of selecting an optimum impedance for a loop start trunk line, comprising successively applying respective ones of a plurality of impedance settings to the loop start trunk line, for each impedance setting measuring the impulse response of the trans-hybrid ...	05/08/2007
7212627	Line interface with analog echo cancellation A line interface performs echo cancellation without the use of a hybrid filter network and includes a transmit path having a line driver, a single matching network terminating the line, and a single transformer. The transformer uses split windings on both the primar...	05/01/2007
7200167	Direct digital access arrangement circuitry and method for connecting to phone lines An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communi...	04/03/2007
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
7194024	Method for adaptive hybrid selection during ADSL modem training The methodology accomplishes adaptive hybrid selection during ADSL modem training. The adaptive hybrid selection method maximizes performance for ADSL modems in the presence of various impairments on the line by optimally selecting the appropriate hybrid based on li...	03/20/2007
7180998	Regulator for impedance balance of a transmission wire pair The present invention relates to a regulator for impedance balancing of first (104) and second wires (106) of a transmission wire pair having respective first and second impedances, the regular comprising: means (1...	02/20/2007
7149246	Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more subcircuits on the substrate. Also included is a bias current supply coupled to the re...	12/12/2006
7145943	XDSL system with improved impedance circuitry An XDSL system comprising a hybrid circuit in operative communication with a transmission line and an XDSL modem associated with a subscriber premises. The hybrid circuit comprises a plurality of selectable impedance circuits having different impedance values. A con...	12/05/2006
7139342	System and method for cancelling signal echoes in a full-duplex transceiver front end There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a line receiver capable of receiving analog receive signals from the cabl...	11/21/2006
7139392	Device and method for suppressing DSL signal echo induced by bridgetap A digital signal line transmission system with reduced echo is provided. A communication line is between a carrier and a user terminal. A bridgetap line has a first end connected to the communication line. An adaptor having a capacitance is connected to the bridgeta...	11/21/2006
7139393	Environmental noise level estimation apparatus, a communication apparatus, a data terminal apparatus, and a method of estimating an environmental noise level A level of a sound signal including a voice signal and an environmental noise signal is detected and a level (power level) is sampled in response to a clock signal. It is detected whether the presently sampled level increases from the previously sampled level. An en...	11/21/2006
7127062	Hybrid circuit for a broadband modem A hybrid circuit that couples a broadband modem to a POTS or ISDN telecommunication line (TL) and includes a transformer bridge circuit (TBC) that includes a bridge circuit (BC). The bridge circuit includes four legs formed by impedance matching networks and parts o...	10/24/2006
7123897	Directional receiver coupling arrangement with frequency selectivity and gain control for DSL A directional coupler for a modem has a high common mode noise rejection characteristic with low transmit signal leakage, and reduced distortion of components mixed with a received signal. A primary filter network is connected to a communications circuit. The primar...	10/17/2006
7113590	Method and apparatus for a differential feedback in an active impedence feedback circuit A method and apparatus is provided for performing an active impedance differential current feedback. A signal is received. A current feedback of an output signal in an active feedback synthesis mode is performed based upon the signal. The active current feedback inc...	09/26/2006
7110511	Twisted pair communication system A communication system for passing information between information services and terminal devices over a twisted wire pair network. The information services include a telephone exchange and other services, such as a data network and a television distribution system. ...	09/19/2006
7110531	Isolation system with analog communication across an isolation barrier An isolation system with analog communication across an isolation barrier includes an isolation barrier circuit having at least one isolation element; a digital to analog circuit having an analog output connected to the isolation barrier and an input for receiving a...	09/19/2006
7106854	XDSL system having selectable hybrid circuitry An XDSL system comprising a hybrid circuit in operative communication with a transmission line and an XDSL modem associated with a subscriber premises. The hybrid circuit comprises a plurality of selectable impedance circuits having different impedance values. A con...	09/12/2006
7103691	Method, system and device for a processor to access devices of different speeds using a standard memory bus A method for accessing a device, such as a memory device and an interface device, by a processor is disclosed. The method involves the processor requesting access permission for the transfer of data. The bridge device grants access permission. The processor in respo...	09/05/2006
7089034	Concurrent wireless/landline interface An apparatus for interfacing at least one landline telephone service, at least one wireless cellular-type telephone service, at least one cellular-type wireless telephone and at least one standard telephonic type communication device through standard building interi...	08/08/2006
7078986	Symmetrical polyphase network First, second, third, and fourth resistors are coupled to first, second, third, and fourth capacitors. A first positive in-phase terminal is coupled to the first resistor and the first capacitor. A first negative in-phase terminal is coupled to the fourth resistor a...	07/18/2006
7072464	Network communication device and hybrid circuit thereof A network communication device and hybrid circuit thereof. The hybrid circuit includes a first transformer, a second transformer and a protector electrically connected between the primary winding of the first transformer and the primary winding of the second transfo...	07/04/2006

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Class 379/402 - Hybrid circuit