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7558385 |
Impedance adapter for a high-bandwidth transmission channel of a copper-wired terminal system
An impedance matcher for matching the impedance of a high bit rate transmission channel of a copper-wired terminal installation comprising a high bit rate x-DSL modem (M) and a jack (P; P 1; P 2, ...
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7542562 |
Method for automatically adapting levels of signals exchanged in a communication network
The invention concerns a method and a device for automatically adapting the levels of signals exchanged in a telephone network, between a first set and a second set. The method is characterized in...
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7496150 |
Transmission apparatus with variable impedance matching
The invention provides a transmission apparatus ( 100 ) for transmission of electrical signals between a line driver ( 205 ), which is connected to a transmission line ( 201 ), and a switching...
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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...
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7218729 |
Subscriber line interface circuitry with current drivers for downstream voice and data signals
A subscriber line interface circuit apparatus includes an impedance bridge coupled to a subscriber line. A first pair of current drivers is coupled to the impedance bridge for driving a voice...
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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...
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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...
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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...
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7190769 |
Apparatus for controlling operation of a recording device with a telephone instrument
An apparatus for controlling operation of a recording device with a telephone configured for orientation in a first state and a second state includes: (a) an information conveying section for...
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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...
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7167555 |
Method for matching an adaptive hybrid to a line
Methods for matching adaptive hybrids ( 15 ) to lines ( 16 ) for making reflectograms of the lines ( 16 ) measure ( 1 ) input impedances (Z meas ) of the lines ( 16 ), model ( 2 ) characteristic...
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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...
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7072462 |
Estimation of DSL telephone loop capability using CAZAC sequence
A system for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. A Constant Amplitude Zero Auto Correlation (CAZAC) sequence signal is generated and...
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7065180 |
System and method for hitless monitoring access of a communications circuit
A system for monitoring a plurality of communication circuits includes an impedance element configured to be switchably connected to one of the plurality of communication circuits. The impedance...
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7062037 |
Generic line impedance matching circuit using decomposed configurable transfer functions
A technique for implementing impedance matching circuits 100 that use the transfer functions of each line impedance model. This technique allows implementation of an impedance match for a diverse...
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7054279 |
Method and apparatus for optimizing signal transformation in a frame-based communications network
A method of and apparatus for optimizing signal transformation from a twisted pair transmission line to a combination transmitter and receiver for a frame-based communications network, the...
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7031462 |
Electronic inductor with transmit signal telephone line driver
In an electronic inductor circuit, an operational amplifier drives the base of the electronic inductor transistor, and receives negative feedback from the emitter of the transistor. The transistor...
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7027562 |
System and method to reduce echoes in voice communications
A system and method to reduce echoes in voice communications are described. Input data containing return loss values of a communication trunk within a communications network is received, the return...
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7027588 |
Telephone apparatus comprising monitoring means
This apparatus ( 1 ) comprises monitoring means for an environment ( 2 ). These means are an integral part of a mobile telephone, for example. Thus, if an event occurs, a telephone communication...
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7023985 |
Circuit for electronically generating a call impedance
The present invention relates to a circuit for electronically generating a call impedance in telephone terminals, comprising a call alternating voltage that may be tapped between a first and a...
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7020274 |
Universal apparatus and method for interfacing signals with telephony networks
A communication apparatus is used to interface signals with any one of a plurality of telephony networks having different impedances. The apparatus includes memory, a processor, a digital-to-analog...
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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...
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6990191 |
Method and apparatus for handling voice and data signals
A method and apparatus is provided for impedance matching for an apparatus capable of supporting voice and data. The method includes receiving an input signal having at least one of a voice...
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6985578 |
Low voltage broadband line driver
The present invention relates to broadband line drivers, comprising a cascade connection of an operational amplifier (A) and a transformer (T), which can be integrated on chip. This is obtained by...
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6980645 |
Low-pass filtering device with integrated insulator and private installation comprising same
A filtering device for a narrow-band terminal in a private installation connected to an access network carrying narrow-band services (analogue or ISDN) and broad-band services (xDSL or HomePNA)....
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6970557 |
Cordless telephone-to-sound card interface adapter having a hybrid transformer circuit
A cordless telephone-to-sound card interface adapter provides a connection between any standard cordless telephone system and a sound card of a computer for PC-to-PC or PC-to-telephone voice...
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6968049 |
Transmission of charging signals on a data transmission path
An apparatus for transmitting charging signals on a data transmission path having a line impedance includes a driver device for setting a line voltage level that corresponds to the line impedance....
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6950512 |
Circuit arrangement for forming the termination of an analogous subscriber line
The invention relates to a circuit arrangement for forming the termination of an analogous subscriber line which comprises a first connection and a second connection for connecting a twin-wire...
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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...
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6931122 |
Single 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, a pair of receiver input nodes, and a pair of...
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6925172 |
Line interface with gain feedback coupled matching impedance
A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit including a transmitter input coupled to an input of a transmission...
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6925171 |
Universal impedance matching network for the subscriber line integrated circuits
A codifier/decodifier (CODEC) filter circuit ( 250 ) connected in a subscriber line interface circuit ( 202 ) includes a transmit section ( 264, 262, 260 ) for converting differential voltage audio...
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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...
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6904144 |
Impedance compensation in interfacing a modem to a telephone line
According to a disclosed embodiment, the ideal magnitude and phase of an ideal impedance for interfacing a modem with a telephone line is determined. This ideal impedance can be determined in the...
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6836810 |
Backplane system using incident waveform switching
A backplane bus system and related method for increasing the throughput of cPCI-specified backplane architectures. The system includes an interposer card for transforming reflective-wave switching...
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6819760 |
Adaptive energy detector gain control in physical layer transceiver for home telephone wire network
A novel physical layer transceiver is provided for receiving data transmitted via residential wiring. The transceiver includes an input circuit for receiving an incoming pulse signal, and an energy...
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6788745 |
Circuit and method for active termination of a transmission line
An improved line driver 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 uses a...
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6760434 |
Dual impedance hybrid
A method and apparatus for coupling an xDSL transceiver with a subscriber line is disclosed. A hybrid circuit is disclosed which exhibits a different relative gain factor for transmitted signals...
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6757380 |
Impedance blocking filter circuit for digital subscriber line communication systems
An impedance blocking filter circuit is used in telecommunication systems for interconnecting between incoming telephone lines carrying Digital Subscriber Line (DSL) signals and a customer's...
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6754338 |
Bidirectional loss/slope equalizer arrangement
A bidirectional equalizer arrangement for cancelling the effect of residual capacitance and/or residual resistive loss in a separation filter having a low-pass filter and a high-pass filter. The...
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6751315 |
High bandwidth phone line transceiver with capacitor isolation
A high bandwidth telephone line transceiver for connecting telecommunications equipment to a telephone line provides a pair of isolation capacitors connected to the telephone line to transmit the...
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6745014 |
Communications interface for wireless communications headset
A universal interface adapter circuit interfaces, for example, a wireless communications headset with any type of communications system, including those that require push-to-talk (PTT) signaling....
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6731751 |
Apparatus for cordless computer telephony
An interface apparatus interposed between a cordless telephone base unit and a personal computer sound card. Such interface emulates a Central Office connection with respect to the telephone and a...
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6731749 |
Telephone line interface circuit with intelligent line current and voltage control
A telephone line interface circuit is disclosed having intelligent line current control that can adjust to the various requirements of worldwide telephone systems (DC masks), and/or can reduce the...
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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...
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6728370 |
Method and apparatus for impedance matching
A method and apparatus is provided for impedance matching for a system capable of supporting voice and data bands. The method includes receiving an input signal having a voice and data band,...
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6724890 |
Adaptive transmission line impedance matching device and method
An adaptive transmission line impedance matching device and method are disclosed. The device and method can be used, for example, in xDSL and home phone line network applications. The adaptive...
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6697485 |
Data signal attenuator and systems and methods for using same
The present invention provides apparatus and methods for attenuating signals received from a source over a data transmission line, having an unknown resistance, to achieve optimized signals in...
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6683949 |
Handset port interface including DC measurement and transmit path calibration
A handset port interface including DC measurement and transmit path calibration. In an interface device for interfacing a telephone instrument, such as a headset, a handset, a modem, or a...
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6665403 |
Digital gyrator
A digital device for controlling the DC line current on a telephone line which includes a digital device that utilizes a digital filter for setting the DC line current. By controlling the DC line...
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