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| Number | Title | Issue Date |
| 8045491 | Signal handling for wireless clients An apparatus having a corresponding method and computer program comprises an input circuit to receive packets of data from a network; a memory to store packet filter criteria for one or more wireless clients; a filter circuit to drop one or more of the packets of da... | 10/25/2011 |
| 7876718 | Echo reduction This invention provides a technique to reduce echoes not adequately attenuated by echo cancellers during initial periods of voice communication. Signals transmitted across communication networks are often reflected back to the caller resulting in echo. Echo cancelle... | 01/25/2011 |
| 7392520 | Method and apparatus for upgrading software in network bridges Method for upgrading software in a network bridge that is part of a VLAN includes sending notification to other bridges of the VLAN that the bridge is scheduled for upgrading; suspending VLAN registration and membership information in the other bridges while upgradi... | 06/24/2008 |
| 7386038 | Startup protocol for high throughput communications systems A startup protocol is provided for use in a communications system having a plurality of transceivers, one transceiver acting as a master and another transceiver acting as slave, each transceiver having a noise reduction system, a timing recovery system and at least ... | 06/10/2008 |
| 7342954 | Adaptive modulation for wireless networks The invention relates to communication between terminals. Where communication is over an ideal channel then a high throughput modulation scheme can be used. Where the terminals suffer interference or noise, transmission can be modified to a more robust modulation sc... | 03/11/2008 |
| 7305216 | Transmitting and receiving arrangement with interference signal suppression control A transmitting and receiving arrangement is disclosed having a transmission path, a reception path, and a control device for suppression of interference signals which are produced by crosstalk from the transmission path to the reception path. The control device inpu... | 12/04/2007 |
| 7286496 | IP network communication device with facsimile communication function IP network communication device which allows facsimile communication conforming to ITU-T recommendation V.34 in the network conforming to ITU-T recommendation T.38. This IP network communication device comprises a call controller for setting the call connection of a... | 10/23/2007 |
| 7278039 | Physical layer energy saving technique for transceivers A first physical layer device of a first network device includes a sense circuit that senses activity on a medium and with the first physical layer device. An autonegotiation circuit attempts to establish a connection with a second physical layer device of a second ... | 10/02/2007 |
| 7268696 | Directional signal and noise sensors for borehole electromagnetic telemetry system An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved n... | 09/11/2007 |
| 7263074 | Voice activity detection based on far-end and near-end statistics Methods and apparatus of managing a communication system, wherein a decision regarding a level of activity at a first end is made based at least in part on the level of activity at the second end. In one embodiment, the energy level of a first-end audio signal is me... | 08/28/2007 |
| 7254116 | Method and apparatus for transceiver noise reduction in a frame-based communications network A method of and apparatus for noise reduction for a transceiver transmitting frames over a transmission medium in a frame-based communications network. A transceiver transmit path and a transceiver receive path is provided. A blocking switch is located in the transc... | 08/07/2007 |
| 7248708 | Noise canceling microphone An improved noise canceling microphone is provided including robust design features and advanced noise control and speech discrimination convergence characteristics. Two adaptive controllers are used to ensure robust performance in quickly changing acoustic environm... | 07/24/2007 |
| 7236463 | Transceiver for echo and near-end crosstalk cancellation without loop timing configuration A transceiver for echo and near-end crosstalk cancellation without a loop timing configuration. The transceiver comprises a receiver, a timing recovery circuit, a same-channel phase interpolator, an echo canceller, a near-channel phase interpolator and a near-end cr... | 06/26/2007 |
| 7221659 | Method and system for managing erroneous attenuation of signal According to one embodiment of the invention, a method for managing communication impairments between Internet Protocol devices is provided. The method includes determining a transmission of a signal comprising a comfort noise, where the signal is transmitted from a... | 05/22/2007 |
| 7177373 | Continuous self-calibration of internal analog signals A method and apparatus for monitoring and adjusting an analog signal of an operating circuit. The apparatus includes a control circuit, an analog-to-digital converter, and a comparator. The control circuit has an analog generator for generating the analog signal and... | 02/13/2007 |
| 7174192 | Method for controlling a hands free system, radio apparatus, and hands free apparatus A radio apparatus, to be used as a first ending node of a communication network, is connectable to a hands-free apparatus by a local radio link to form a hands-free system. A call made on the hands-free apparatus for an second ending node in the communication networ... | 02/06/2007 |
| 7161959 | Method and system for efficiently passing the silence or unused status of a DSO channel through a DsO switch matrix and a data switch A method and system for improving the passage of silent or unused status of Ds0 channel to a data switch with a Ds0 switching capacity. The method allows the Ds0 channel source to be the only equipment that must engage a digital signal processor to remove silent and... | 01/09/2007 |
| 7162420 | System and method for noise reduction having first and second adaptive filters An apparatus and method for noise reduction employ a first processor having one or more channels, each channel comprising a respective first processor filter, and each channel configured to receive a respective one of one or more input signals. The first processor i... | 01/09/2007 |
| 7142535 | Hierarchical data collection network supporting packetized voice communications among wireless terminals and telephones A packet-based, hierarchical communication system, arranged in a spanning tree configuration, is described in which wired and wireless communication networks exhibiting substantially different characteristics are employed in an overall scheme to link portable or mob... | 11/28/2006 |
| 7120130 | Seamless redundant echo canceller replacement in a multi-channel echo canceller An echo cancelling system comprises a system controller for directing inbound and outbound PCM signals to one of two echo canceller modules. The system controller receives status information from the echo cancellers and maintains state information pertaining to the ... | 10/10/2006 |
| 7106856 | Method and apparatus for performing echo cancellation within a communication network A switching center for use in a communication network includes a pool of echo cancellation units for use in providing echo cancellation services to users associated with the switching center on an “as needed” basis. A communication connection being supported by ... | 09/12/2006 |
| 7075980 | Digital connection detection technique A technique is described for reliably determining whether a direct digital connection exists between a transmitting server modem and a receiving client modem. Such a determination is an essential part of the training procedure for modems that conform to ITU-T Recomm... | 07/11/2006 |
| 7058315 | Fast decision threshold controller for burst-mode receiver A repetitive burst-mode input signal that has a dark time portion, a preamble portion, and a payload portion is converted into a limited output signal in accordance with a decision threshold level, which is controlled by selectively coupling an averaged value of the... | 06/06/2006 |
| 7054346 | Enhanced frequency hopping in a wireless system A wireless endpoint employs frequency hopping for communicating signals in a wireless communications system. Over a time period T, the wireless endpoint performs pseudo-random selection of a frequency from a hopping set of N frequencies such that over at least a por... | 05/30/2006 |
| 7050439 | Method for performing discontinuous transmission in an asynchronous transfer mode A method for performing discontinuous transmission in an asynchronous transfer mode is described, wherein a downlink transmission of an ATM cell is performed each time a predetermined number of signal frames indicating a speechless period has been supplied, and wher... | 05/23/2006 |
| 7047185 | Method and apparatus for dynamically switching between speech coders of a mobile unit as a function of received signal quality A power management system for a mobile unit wherein the mobile unit detects the quality of the signals received from the base station. Based on this signal quality, the mobile unit determines if the voice data could be adequately transmitted using a secondary speech... | 05/16/2006 |
| 7046795 | Method and apparatus for active latency characterization Briefly, in accordance with one embodiment of the invention, a method for actively characterizing the latency of an audio channel of a computer, such as a personal computer, is provided. At least two signal streams for a waveform are created in the audio channel. Th... | 05/16/2006 |
| 7031269 | Acoustic echo canceller An apparatus and method for echo cancellation is presented. The echo canceller comprises an adaptive filter that tracks the impulse response of the echo path and produces an estimate of the echo. Filter adaptation is controlled by a controller based on the rate of t... | 04/18/2006 |
| 7023812 | System and method for improving modem transmission through private branch exchanges, central offices, and other systems A modem including an echo canceller adapted to determine locations of far-end echo sources. The echo canceller is adapted to send a signal to turn off network echo suppressors and enter a training mode. A training signal at a predetermined modem training frequency i... | 04/04/2006 |
| 7006458 | Echo canceller disabler for modulated data signals A method and system receives a far-end signal and determines whether the far-end signal is representative of a modulated signal. The method and system also receives a near-end signal and determines whether the near-end signal is representative of a modulated signal.... | 02/28/2006 |
| 6993667 | Apparatus for automatic energy savings mode for ethernet transceivers and method thereof An energy saving circuit is connected to a receiver of a first physical layer of a first network device. The energy saving device has first and second energy saving modes. In the first energy saving mode, a sense circuit generates a receive signal when connection ac... | 01/31/2006 |
| 6990084 | Echo cancellation with dynamic latency adjustment An echo cancellation system measures an average delivery rate of a reference data signal and an average capture rate of an input data signal. From the measured data rates, the system converts the reference data signal to a domain of the input data signal. An echo ca... | 01/24/2006 |
| 6970559 | Method and apparatus for detecting echo cancellers A method is provided for detecting echo cancellation in a communication network. The method includes the steps of transmitting from an originating unit a pre-defined echo cancellation detection signal to a receiving unit. The resulting signal is detected by the rece... | 11/29/2005 |
| 6970442 | Multiple-access scheme for packet voice that uses voice activity detection A packet transmission arrangement maintains a certain minimum bandwidth for a call. When a silence period is detected, the bandwidth that is allocated to the call is reduced. When a speech period is detected, the reduced bandwidth remains in force, unless there is s... | 11/29/2005 |
| 6959167 | Noise-level adaptive residual echo suppressor An improved echo control system has an adaptive controlled echo canceling filter arrangement in which a background filter updates the filter coefficients of an echo shaping filter responsive to a normalized least mean square (NLMS) algorithm. An adaptive control mod... | 10/25/2005 |
| 6947395 | Locating network echos An echo cancelling system for cancelling echoes in a communication path includes an echo locator and an echo canceller. The echo locator is coupled to the communication path and locates the positions of echo signals received from the communication path. The echo can... | 09/20/2005 |
| 6940829 | Method and processor in a telecommunication system In a method of running a processor for high performance operation in a communication network one function of the processor is a calculation using an algorithm. The function can include calculation for each of a plurality channels. In situations, when there is not av... | 09/06/2005 |
| 6912209 | Voice gateway with echo cancellation A network gateway is configured to facilitate on line and off line bi-directional communication between a number of near end data and telephony devices with far end data termination devices via a hybrid fiber coaxial network and a cable modem termination system. The... | 06/28/2005 |
| 6819709 | Startup protocol for high throughput communications system A startup protocol is provided for use in a communications system having a plurality of transceivers, one transceiver acting as a master and another transceiver acting as slave, each transceiver having a noise reduction system, a timing recovery system and at least ... | 11/16/2004 |
| 6792038 | Startup protocol for high throughput communications systems A startup protocol is provided for use in a communications system having a communications line with a master transceiver at a first end and a slave transceiver at a second end, each transceiver having a noise reduction system, a timing recovery system and at least o... | 09/14/2004 |
