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| Number | Title | Issue Date |
| 7587042 | High performance ADSL line conditioner system and method A DSL line conditioner achieves high performance sufficient to simultaneously support video, voice and data signals on standard telephone twisted pair lines over substantially greater distances than are currently available. The line conditioner automatically adjusts... | 09/08/2009 |
| 7483528 | Loop extender with selectable line termination and equalization In accordance with the present invention, a loop extender for improving the transmission of digital subscriber line (DSL) signals over a local loop is disclosed. The loop extender includes selectable line termination and equalization (SLTE) DSL amplification circuit... | 01/27/2009 |
| 7321612 | Bit stream conditioning circuit having adjustable PLL bandwidth A high-speed bit stream interface module interfaces a high-speed communication media to a communication Application Specific Integrated Circuit (ASIC) via a Printed Circuit Board (PCB). The high-speed bit stream interface includes a line side interface, a board side... | 01/22/2008 |
| 7317769 | Bit stream conditioning circuit having adjustable input sensitivity A high-speed bit stream interface module interfaces a high-speed communication media to a communication Application Specific Integrated Circuit (ASIC) via a Printed Circuit Board (PCB). The high-speed bit stream interface includes a line side interface, a board side... | 01/08/2008 |
| 7269215 | Equalization processing method and the apparatus for periodic fluctuation of transmission line characteristic A method used in equalization processing is provided, in which a reference signal is received and a change point of transmission line characteristics is detected. A basic frequency signal of fluctuation period of the transmission line characteristics is extracted, a... | 09/11/2007 |
| 7239665 | Selection of pre-computed equalizer based on channel characteristic In some embodiments, a method includes determining a characteristic of a communication channel and selecting, on the basis of the determined characteristic, a pre-computed equalizer characteristic for application to signals received via the communication channel. | 07/03/2007 |
| 7230989 | System and method for processing digital visual interface communication data signals and display data channel communication signals over a transmission line A digital communication system for transmitting and receiving Digital Visual Interface (DVI) communication data signals and Display Data Channel (DDC) communication signals over a transmission line comprises an open-loop equalizer circuit and a DDC extension circuit... | 06/12/2007 |
| 7043041 | Integrated telecoil amplifier with signal processing The invention concerns a method of receiving and processing both audio and non-audio signals for use in a hearing aid or other listening device comprising converting electromagnetic radiation to electrical signals, amplifying said electrical signals to produce ampli... | 05/09/2006 |
| 7039103 | Asymmetric digital subscriber line methods suitable for long subscriber loops Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first direction, ... | 05/02/2006 |
| 6977958 | Differentially-driven loop extender Systems and methods are disclosed for improving DSL performance, including ADSL and VDSL performance, over a local loop between a telephone company central office and a customer premises. In particular, a loop extender is coupled to the local loop and differentially... | 12/20/2005 |
| 6940956 | Electric outlet based power status notification device, system, and method There is provided a device, system, and method for reporting a change in the power status of power supplied through an electric outlet. A power outage notification device detects the change in the power status of the power, such as a power outage or a power restorat... | 09/06/2005 |
| 6907062 | PRBS generator selection in modem communication The present invention relates to a system and method for selecting one of plurality of PRBS generators for use with a modem. The modem includes a measuring device adapted to measure an operating environment of the modem; and a storage device adapted to store a list ... | 06/14/2005 |
| 6731748 | Audio interface for satellite user terminals An apparatus, system, and method for providing an audio interface between multiple deskset phones and a single radio antenna unit (RAU). The audio interface includes a transmit path and a receive path. The transmit path carries transmit signals from the multiple des... | 05/04/2004 |
| 6507606 | Asymmetric digital subscriber line methods suitable for long subscriber loops Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first ... | 01/14/2003 |
| 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 |
| 5889854 | Technique for compensating for signal attenuation on a telephone line An apparatus compensates for an attenuation of a signal on a telephone line in a communication system connected to the telephone line via a transformer. A photo coupler detects a loop current at a primary winding of the transformer. A controller generates... | 03/30/1999 |
| 5708703 | Wide range equalizer with line length detection An automatic line equalizer for use with a T1 or an E1 repeater in a telecommunications system is disclosed. The equalizer includes a first equalizing means for equalizing an input line having a line length falling within a first range and a second equali... | 01/13/1998 |
| 5592133 | Build-out network for a built-in type balanced line driver circuit The present invention relates to a BON built-in type balanced line driver circuit which reduces the size and cost of the unit by excluding duplication of impedance circuits, excluding duplication of an unbalanced/balanced converting transformer, convertin... | 01/07/1997 |
| 5422950 | Remote terminal channel unit for telephone transmission lines An automatic loss compensation for use in a two to four wire hybrid converter in a telephone system. Many hybrid converters provide a substantially fixed gain for receive signals that are provided to the customer loop telephone line and for transmit signa... | 06/06/1995 |
| 5412716 | System for efficiently powering repeaters in small diameter cables A system of impedance matching is provided to match the total impedance of the cable system to the total impedance of the powered elements such as the repeaters. The source impedance of the power supplies may be considered as part of the cable impedance. ... | 05/02/1995 |
| 5323461 | Telephone line interface circuit with voltage switching A two-wire telephone line interface circuit comprises a driver circuit for supplying direct current on the line, a controlled voltage generator, a sensing circuit for monitoring the line current, a control circuit for controlling an output voltage of the ... | 06/21/1994 |
| 5271060 | Circuitry for interfacing telecommunications equipment to a communication channel Measuring the programming resistor in a data jack by placing the resistor in an AC voltage divider circuit via a transformer. An AC voltage (preferably generated by the modem's own transmitter circuitry) is applied to the voltage divider circuit, and an A... | 12/14/1993 |
| 5249224 | Methods and apparatus for providing reciprocal impedance conversion A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating recipro... | 09/28/1993 |
| 5086462 | Terminal repeater having a function for repeating DC loop signal A terminal repeater placed in at least one communication line connecting an exchange and at least one terminal device, comprising a DC cut-off circuit providing continuous paths for AC signals flowing through the lines while providing discontinuous paths ... | 02/04/1992 |
| 4961219 | Circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit A circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit is disclosed. The circuit includes tip drive and ring drive amplifiers connected to the tip and ring leads respectively, of a subscriber loop. The tip drive ... | 10/02/1990 |
| 4894864 | Interface circuit An analog/digital interface circuit in which an analog terminating impedance is partially synthesized by supplying a digital output (T) signal to a digital input (R) via a digital filter (17). A variable resistive transmission path is connected across the... | 01/16/1990 |
| 4887293 | Trunk circuit with loop length gain equalization A key telephone system comprised of a key service unit connected to a plurality of local sets via four-wire conductors for providing full duplex signal communication between the key service unit and sets. Signals are carried by a first pair of each of the... | 12/12/1989 |
| 4746881 | Equalizer for frequency independent and dependent transmission loss components with a pilot used for the frequency independent component In addition to an information signal subjected to a frequency dependent and a frequency independent loss component and delivered to an automatic equalizer through a transmission path which is typically a subscriber's communication path between a subscribe... | 05/24/1988 |
| 4674119 | Wide-band high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry A wide band high voltage and high power amplifier is particularly useful for telephony applications. The amplifier employs a flyback converter with the capacitor storage element coupled across the line. The subscriber line is characterized in having a def... | 06/16/1987 |
| 4670902 | Circuitry for telephone systems The invention refers to a circuit for telephone systems for the transmission of alternating current signals such as voice signals from a subscriber telephone system to a central office, wherein a signal transformer is provided with a by-pass for the direc... | 06/02/1987 |
| 4629905 | Circuit arrangement comprising two feed circuits connectable to a load having mutually opposite poling A circuit arrangement comprises two feed circuits which are connectible to a load with mutually opposite polarity. The circuit arrangement avoids mechanical contacts in the load circuit, at least with respect to one feed circuit. This is achieved in that ... | 12/16/1986 |
| 4592068 | Repeater for a digital transmission system A repeater for PCM or digital transmission systems includes, in addition to the usual primary feedback control loop, a secondary feedback control loop having a low-pass filter and a peak detector to derive a control signal for a controllable impedance in ... | 05/27/1986 |
| 4490692 | Reverse equalization network An equalization network is disclosed combining negative slope equalization with low pass filtering and low frequency compensation. The network is for use on electrical lines transmitting electrical signals in the voice frequency range and includes circuit... | 12/25/1984 |
| 4456991 | Telephone line circuit and system A telephone line circuit and system for interfacing digital exchange line circuits to a terminal interface of a switching network is disclosed. The system includes controllable active circuit impedance matching means for reducing impedance mismatch betwee... | 06/26/1984 |
| 4413240 | Automatic line buildout circuit for digital data transmission There is disclosed an automatic line buildout circuit which includes in its signal path two variable filters, each implemented by a transconductance operational amplifier circuit. Each filter exhibits a transfer function pole with a frequency which is dir... | 11/01/1983 |
| 4357495 | Telephone line feed The direct current line feed for a telephone subscriber's line is derived from a variable voltage source connected to the line. In one case, the source is series connected in one leg of the line while in the other case it is connected across the line. In ... | 11/02/1982 |
| 4354160 | Amplitude equalizer An amplitude equalizer, suitable for use on telephone lines, is disclosed. The circuit includes an adjustable-gain amplifier, and an adjustable-slope equalizer section. A mixer section serves to combine the input signal with a filtered version thereof, in... | 10/12/1982 |
| 4277655 | Automatic gain repeater An automatic gain repeater for varying the amplification of AC signals transmitted through a telephone subscriber loop in accordance with the impedance of such subscriber loop is described. The automatic gain control circuitry includes controllable variab... | 07/07/1981 |
| 4268716 | Audio teleconferencing A control unit for establishing a four-wire connection between two terminals via a pair of telephone lines comprises switching means which are operable to provide a connection to a pair of telephone lines, signalling means connectible to said lines via sa... | 05/19/1981 |
| 4261051 | Time-division-multiplexed exchanger In a time-division-multiplexed exchanger having digital filters disposed in a channel system, a level adjuster wherein data for setting line losses corresponding to respective combinations of interconnections of a plurality of lines received at outgoing a... | 04/07/1981 |
