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| Number | Title | Issue Date |
| 8144861 | Communication circuitry, devices and methods A method of signal communication includes receiving a selection signal, and selecting a selected frequency range used for a multi-carrier signal communication from a set of predetermined frequency ranges for signal communication depending on the selection signal. Th... | 03/27/2012 |
| 8139759 | Line state detecting apparatus and transmitting apparatus and receiving apparatus of balanced transmission system A line state detecting apparatus provided in a balanced transmission system includes, in transmission lines comprising a pair of conductors W1, W2 connected to a transmitting portion 13, current transformers T11, T12 primary sides ... | 03/20/2012 |
| 7925005 | Longitudinal balance calibration for a subscriber line interface circuit A method of calibrating longitudinal balance for a subscriber line interface circuit includes providing a first and a second driver of a differential driver pair for driving a subscriber line. An output of each of the first and second drivers is coupled to a common ... | 04/12/2011 |
| 7313103 | Method and apparatus for interactive communication between half-duplex and full-duplex systems A communication system (100) includes a first communication unit (101, 102, 103, 104) capable of communicating over a full-duplex persistent-connection link provided by a full-duplex network (105) and a second communication unit (151, 152... | 12/25/2007 |
| 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 |
| 7134101 | Active impedance compensation Active impedance compensation is accomplished in a bus system by means of a variable capacitor element associated with a connection circuit between system slave devices and an impedance balanced channel. The variable capacitor elements may be programmed using a cont... | 11/07/2006 |
| 7088961 | Circuitry to establish a wireless communication link Circuitry to transmit an analog data signal over a wireless communication link includes a receiver that receives a data signal, an automatic gain control circuit that keeps a peak amplitude of the data signal substantially constant and within a predetermined linear ... | 08/08/2006 |
| 7072463 | Apparatus and method for programmable line interface impedance matching A line interface capable of connecting to a variety of transport mediums, each having a different impedance. The line interface comprises a programmable resistor. The programmable resistor along with an external resistor provide a range of resistor values which are ... | 07/04/2006 |
| 7031456 | Method, device and system for output impedance calibration that invariably maximizes hybrid performance A hybrid system with adjustable on-chip components and a method calibrating the same invariably maximizes hybrid performance despite of on- and off-chip component mismatches and imperfections. The hybrid system has a main DAC, a replica DAC, and three or four resist... | 04/18/2006 |
| 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 loss values being measured at each frequency of a plurality of frequ... | 04/11/2006 |
| 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 (D/A) converter, and an interface port. Different sets of impedance ... | 03/28/2006 |
| 7006610 | Download booster for ADSL transmission Systems and methods are described for a download booster for ADSL transmission. A method includes extending a digital subscriber loop including: coupling a telephone company central office to a customer premises via the digital subscriber loop; filtering a downstrea... | 02/28/2006 |
| 7006625 | Cordless telephone-to-sound card interface adapter with hybrid transformer and control 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 communications over the Internet. The interface adapter includes a hybrid t... | 02/28/2006 |
| 6990190 | Method and system for remote telephone calibration A method and system for remotely calibrating a headset telephone with a reliable, accurate and easy to use user interface is provided. This method makes use of the remote programmability of advanced telephone headsets and DTMF signal encoding and permits the custome... | 01/24/2006 |
| 6980056 | Multiple stage attenuator An attenuator includes a first stage 601a having a first operational amplifier 602a and a tapped resistor 603a. Tapped resistor 603a has an input for receiving input data, an output coupled to an output of firs... | 12/27/2005 |
| 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 |
| 6973183 | Method and apparatus for dynamically matching impedance In one aspect of the invention a communication device including circuitry operable to facilitate dynamic impedance matching includes an image impedance operable to be coupled to a receiver/transmitter pair associated with a line impedance. The device also includes m... | 12/06/2005 |
| 6940981 | Apparatus and method of limiting power applied to a loudspeaker A method of limiting the power applied to a loudspeaker is disclosed, in which both the voltage and current applied to the loudspeaker are measured, and instantaneous power is directly calculated and used to control the level of the input signal that drives the ampl... | 09/06/2005 |
| 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 |
| 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 |
| 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 |
| 6782096 | Subscriber line driver and termination A subscriber line driver (SLD) is provided for the continuous and automatic transformation of the characteristics of a communication system signal so that the signal conforms to a power spectral distribution (PSD) standard. The signal is transformed by the SLD which... | 08/24/2004 |
| 6742170 | Repeatable swizzling patterns for capacitive and inductive noise cancellation Disclosed herein are swizzling techniques that may provide capacitive and inductive noise cancellation on a set of signal lines. Positive noise due to a capacitive coupling between attacker signal lines and near victim signal lines is, in part, cancelled by negative... | 05/25/2004 |
| 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 |
| 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 various data terminal and data communications equipment. In a ... | 02/24/2004 |
| 6694017 | Automatic gain control apparatus determining echo return loss An automatic gain control apparatus, employed in a communication system having a circuit that interfaces a two-wire line to a four-wire line, measures the echo return loss occurring at the interface, calculates a gain from the echo return loss, and amplif... | 02/17/2004 |
| 6694014 | Constant impedance digital line interface circuit A digital line-interface circuit (100) presents a constant impedance to a telephone line (102) by emulating a short or a ground connection between the leads of the telephone line when the transmitter (104) is disabled. The receiver (106) includes a pair o... | 02/17/2004 |
| 6668176 | Fixed wireless terminal A fixed wireless terminal such as a wireless local loop terminal comprising: memory (210) storing characteristics for at least one network, means (214, 220) for accepting network information particular to a subscriber and processing means (208) for readin... | 12/23/2003 |
| 6654462 | Line terminal circuit for controlling the common mode voltage level on a transmission line A line terminal circuit comprises a buffer section (A, D) for connection to a transmission line (TL) and for performing at least one of the functions receiving signals from said transmission line and transmitting signals via said transmission line; a cont... | 11/25/2003 |
| 6628779 | Method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors A method and system for providing suppression of near-end speech energy for tone signal detectors. In accordance with the invention a system or device is connected between the tip and ring on a subscriber loop, the subscriber loop being connected to offic... | 09/30/2003 |
| 6542605 | Method and arrangement for choosing supply voltage Line circuits can be supplied with a first voltage or a second voltage of a lower absolute value. At least the second voltage is variable. The line voltages of at least active line circuits are measured, and possible values for the second voltage are prog... | 04/01/2003 |
| 6477250 | Adjustable hybrid having dial tone alignment configuration A two-wire line conditioning apparatus utilizing dial tone for alignment. Variable impedances are iteratively adjusted using a multitone calibration signal. The hybrid device filters out dial tone components in measuring the echo of the multitone signal d... | 11/05/2002 |
| 6477249 | Communications signal splitter and filter A splitter separates telephony traffic (POTS) from digital subscriber line (ADSL) traffic occupying a higher frequency band. The splitter comprises a low-pass filter for passing the telephony traffic, the low-pass filter being operable to vary its filteri... | 11/05/2002 |
| 6453042 | Method and system for remote telephone calibration A method and system for remotely calibrating a headset telephone with a reliable, accurate and easy to use user interface is provided. This method makes use of the remote programmability of advanced telephone headsets and DTMF signal encoding and permits ... | 09/17/2002 |
| 6445791 | System and methods for modem interface An interface for coupling a modem port with a transmission line includes a hybrid converter having a variable gain amplifier coupling a transmit path of a first differential polarity and a received path of a second differential polarity.... | 09/03/2002 |
| 6298046 | Adjustable balancing circuit for an adaptive hybrid and method of adjusting the same An adjustable balancing circuit (900) for an adaptive hybrid is suitable for use with a two-conductor transmission line in full duplex communications. In a preferred example, the adjustable balancing circuit (900) includes a first impedance structure (902... | 10/02/2001 |
| 6285707 | Temperature compensation for communications cards Methods and apparatus for providing temperature compensation for a communications card, such as a modem or network card, to minimize retrain sequences between the communications card and another communications card during periods of temperature build-up w... | 09/04/2001 |
| 6275582 | Differential line bridge for scaleable near-end speech cancellation for tip and ring tone signal detectors Apparatus for interconnecting the Tip and Ring telephone line interface to subsequent communications equipment or circuits through a differential line bridge circuit that extracts one or more unidirectional paths containing predominantly far-end energy, w... | 08/14/2001 |
| 6262655 | Emergency reporting system and terminal apparatus therein An emergency reporting apparatus for a vehicle includes a memory storing information representing a telephone number of an emergency report receiving center. Connection with the emergency report receiving center is implemented in response to the telephone... | 07/17/2001 |
| 6111949 | Method of rapid automatic hybrid balancing 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... | 08/29/2000 |
