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| Number | Title | Issue Date |
| 7362855 | Subscriber line interface circuitry transceiver A subscriber line interface circuit apparatus includes driver circuitry for combining and driving a downstream voice signal and a downstream data signal onto a subscriber line. Receiver circuitry receives and separates an upstream signal from the subscriber line int... | 04/22/2008 |
| 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 |
| 7330703 | 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... | 02/12/2008 |
| 7260103 | Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit A mode-dependent, battery-coupling switch for a subscriber line interface circuit (SLIC) selectively adjusts its current requirements to provide optimal current handling capability irrespective of the mode of operation of the SLIC. Where current demands of the SLIC ... | 08/21/2007 |
| 7260214 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog se... | 08/21/2007 |
| 7253689 | Low distortion amplifier A low distortion amplifier. The novel amplifier includes a first transistor Q1 having first and second output terminals and an input terminal adapted to receive an input signal, and a second transistor Q2 having first and second output terminals and an... | 08/07/2007 |
| 7253680 | Amplifier system with current-mode servo feedback A system and method for compensating an amplifier apparatus for low frequency and/or DC components of an externally applied input signal as well as for any voltage offsets contributed by the amplifier circuitry. Band-limited servo feedback is applied to predetermine... | 08/07/2007 |
| 7224492 | Facsimile apparatus capable of detecting a line connection A facsimile apparatus can properly detect whether or not the facsimile apparatus is connected to a line. The facsimile apparatus comprises a network control device formed of a semiconductor DAA device having a primary line control part driven by a local power supply... | 05/29/2007 |
| 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 |
| 7212502 | Method and apparatus for dynamically adapting telephony analog loss based on channel content A method is provided for introducing analog loss to an information-bearing signal being transmitted to or from end-user terminal equipment over a communication system such as a cable network The method begins by establishing a communication path to the terminal equi... | 05/01/2007 |
| 7206405 | Enhanced high voltage interface for partitioned subscriber line interface circuit A subscriber line interface circuit contains a high voltage analog section, and a low voltage and digital signal processing section, that monitors and controls the high voltage analog section. The high voltage analog section includes a dual mode tip/ring amplifier u... | 04/17/2007 |
| 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 |
| 7197138 | Programmable device and methods for disabling a ring signal in response to a detected off-hook condition A method and structure for cutting a ring current when a telephone enters an off-hook state. The method includes: (1) activating an off-hook detected signal when the telephone enters an off-hook state, (2) applying the off-hook detected signal to a selected input te... | 03/27/2007 |
| 7181004 | Direct drive for a subscriber line differential ringing signal having a DC offset A method of generating a subscriber line differential ringing signal with a DC component includes providing a time-varying supply level, W(t), having a plurality of non-equidistantly spaced critical points along a folding line. W(t) is coupled to the tip line while ... | 02/20/2007 |
| 7181003 | Direct drive for a subscriber line differential ringing signal A method of generating a subscriber line ringing signal includes the step of applying a time-varying waveform W(t) to the tip line while maintaining the ring line at a pre-determined supply level for a duration T/2. The time-varying waveform is subsequently applied ... | 02/20/2007 |
| 7139528 | RF coupled data access arrangement circuit for telephony customer premise equipment A data access arrangement (DAA) circuit for an item of customer premise equipment (CPE, i.e., telephone terminal equipment) utilizes RF coupling across an isolation barrier between two sides of the DAA circuit. ... | 11/21/2006 |
| 7123629 | Broadband network access device for voice data transmission In the broadband network access device for transmitting narrowband, low-frequency voice signals and broadband, higher-frequency data signals, the voice data is sampled in the data clock pattern and subsequently decimated. The transmission of the data which has alrea... | 10/17/2006 |
| 7092517 | Apparatus and method for regulating an SLIC supply voltage Control circuit and method for regulating the supply voltage of an SLIC circuit (15), having a monitoring circuit (36) for calculating an SLIC supply voltage which is required to reach a nominal supply current (Inom) for an analogue terminal... | 08/15/2006 |
| 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 number of line impedances reusing the same circuit 100 t... | 06/13/2006 |
| 7054374 | Differential simultaneous bi-directional receiver When signaling over cables or other media having significant return impedance, it is generally more efficient to use two conductors to carry two simultaneous bi-directional signals differentially, rather than utilizing unidirectional communications. Bi-directional c... | 05/30/2006 |
| 7054439 | Differential input stage for electronic equipment, comprising means for reducing interference caused by a voltage or current in common mode According to the invention, means for reducing the interference caused by a voltage or a current in common mode, comprise adders (S3; S4) in each path for adding a first counter-reaction voltage (V1) to the voltage of the relevant path, a bridge... | 05/30/2006 |
| 7050509 | Digital isolation system with hybrid circuit in ADC calibration loop An improved digital capacitive isolation barrier system is provided that is suitable for use in a telephone or modem where the locally powered circuits must be effectively isolated from the public telephone system, while permitting data transfer across the barrier. ... | 05/23/2006 |
| 7050577 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog se... | 05/23/2006 |
| 7050574 | Telephone line interface circuit and method A hybrid circuit is disclosed for effectively communicating information over a telecommunications line to which a transmitter and receiver are connected. The hybrid circuit is configured as a filter for filtering at the receiver input signals at predetermined freque... | 05/23/2006 |
| 7046793 | Digital access arrangement circuitry and method having current ramping control of the hookswitch A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition ... | 05/16/2006 |
| 7031454 | Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system An adaptive interface method and apparatus for interfacing a telephony appliance such as an analog telephone, modem, fax modem, facsimile machine teleconferencing device, headset, VoIP telephone or non-compatible digital telephone to a digital, analog or hybrid tele... | 04/18/2006 |
| 7031458 | Method and apparatus for isolation in a data access arrangement using analog encoded pulse signaling The present invention is directed toward a method and apparatus for transferring data across an isolation barrier using high speed analog encoded signals. A line side circuit interfaces with tip and ring contacts on one side of a capacitive isolation barrier that is... | 04/18/2006 |
| 7020277 | DSL line interface having low-pass filter characteristic with reduced external components A line interface couples a data transceiver to a transmission line via a transformer, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range. The line interface includes an input port for receiving an i... | 03/28/2006 |
| 7003103 | Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit A mode-dependent, battery-coupling switch for a subscriber line interface circuit (SLIC) selectively adjusts its current requirements to provide optimal current handling capability irrespective of the mode of operation of the SLIC. Where current demands of the SLIC ... | 02/21/2006 |
| 6999743 | Line interface with second order high pass transfer function A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit including a differential transmitter input coupled to a differential input of a transmission amplifier, a receiver circuit including a dif... | 02/14/2006 |
| 6975723 | Architecture for minimum loop current during ringing and caller ID A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmissi... | 12/13/2005 |
| 6973181 | Method of generating a ring signal in a subscriber line interface circuit technical field In a method and a device for controlling the magnitude of the generated ring signal in a the Subscriber Line Interface Circuit (SLIC) the voltage of the A and B lines to the subscriber from the SLIC is compared to a reference voltage. The device is arranged to contr... | 12/06/2005 |
| 6950514 | Voltage reference filter for subscriber line interface circuit A voltage reference filter for a subscriber line interface circuit removes unwanted noise on a DC reference voltage sourced by a device, such as a codec, and employed by the subscriber line circuit as a differential mode voltage baseline. The DC reference voltage is... | 09/27/2005 |
| 6922469 | Separation of ring detection functions across isolation barrier for minimum power A communication system of the present invention utilizes ring detection circuitry on both sides of an isolation barrier. More particularly, the ring detection circuitry may include ring burst circuitry on the phone line side of the isolation barrier and ringer timin... | 07/26/2005 |
| 6917682 | Method and device for echo cancelling Echo cancelling in a communication line system, particularly an ISDN or XDSL system, is performed with a tunable hybrid having tunable passive elements. The tunable hybrid is integrated in the analog front-end portion of the communication line system. The values of ... | 07/12/2005 |
| 6911739 | Methods and apparatus for improving high frequency input/output performance An input circuit for an integrated circuit (IC), which is mounted on a package having an input pin, rejects signal energy at a first frequency. A first bondwire arranged on the package has one end that communicates with the pin and an opposite end that communicates ... | 06/28/2005 |
| 6823066 | Digital access arrangement circuitry and method having current ramping control of the hookswitch A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition ... | 11/23/2004 |
| 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 |
| 6754341 | External resistor and method to minimize power dissipation in DC holding circuitry for a communication system A CMOS implementation for a DC holding circuit in direct access arrangement (DAA) circuitry is disclosed that provides desirable inductive behavior while minimizing power dissipation required by the CMOS integrated circuit, particularly at high loop currents. The DC... | 06/22/2004 |
| 6735302 | DSP based SLIC architecture with current-sensing voltage synthesis impedance matching and DC feed control A CODEC and a SLIC assembly perform current-sensing-voltage synthesis impedance matching and DC feed control functions. Signal processing that does not require high voltage, such as impedance matching and DC feed control, is performed in the digital domain by the CO... | 05/11/2004 |
