| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 370282000 | Transmit/receive interaction control | 65 |
| 20080198777 | ADDRESSABLE OUTLET, AND A NETWORK USING THE SAME - An addressable outlet for use as part of local area network based on wiring installed in a building, such as telephone, electrical, cable television, dedicated wiring, and the like. The use of such wiring for data communications networks in addition to the wiring's primary usage creates a need for ways of determining the condition of the network and monitoring this information remotely. Network condition includes such factors as continuity of wiring, connector status, connected devices, topology, signal delays, latencies, and routing patterns. Providing basic processing and addressing capabilities within the outlet permits messaging to and from specific individual outlets, thereby allowing inquiries and reports of the condition of the immediate environment of each outlet. In addition, outlets can be configured with sensors to report on voltage, temperature, and other measurable quantities. | 08-21-2008 |
| 20090135747 | RADIO PROTOCOL FOR MOBILE COMMUNICATION SYSTEM AND METHOD - Radio protocol for a next generation mobile communication system is disclosed including a radio link control layer for connecting to an upper layer through a service access point provided in advance and for connecting to a lower layer through a plurality of logic channels provided in advance. The radio link control layer includes at least one radio link control entity for transmission/reception of data to/from up-link or down-link according to a form of a data transmission mode. | 05-28-2009 |
| 20090147707 | DEMULTIPLEXER AND COMMUNICATION DEVICE - Provided is a demultiplexer capable of improving attenuation characteristic and isolation characteristic of a filter having a lower transmission frequency band among two filters having different transmission frequency bands, outside the transmission frequency band of a high-frequency side. A communication device using the demultiplexer is also disclosed. A first spiral wiring portion ( | 06-11-2009 |
| 20100054163 | MULTI-BAND RF COMBINER - An RF (radio frequency) combiner utilizes RF filtering cavities and transmission paths incorporated into an RF impervious material. This allows traditional stand-alone multiplexers to be integrated into a single device without using signal loss-inducing cables and connections between the multiplexers. The simplicity of the RF combiner allows for RF filters to be milled out of the same RF impervious material without requiring an external RF connection and avoids a cascading of multiple RF filters. In one instance, the RF combiner is employed with two BTS (base transceiver stations) to allow the sharing of antennas without the power losses associated with traditional cascading duplexers. | 03-04-2010 |
| 20100110944 | COMMUNICATION TERMINAL APPARATUS, COMMUNICATION ADMINISTERING APPARATUS, COMMUNICATION METHOD, COMMUNICATION PROGRAM, AND RECORDING MEDIUM - A communication terminal apparatus transmits to a communication administrating apparatus, request information requesting issue of identification information and including time information related to the transmission of the information from a requesting unit. The communication administrating apparatus, upon receipt, by a receiving unit, of the request information requesting issue of identification information, generates identification information via a generating unit, and the identification information generated is issued from an issuing unit to the communication terminal apparatus. The communication terminal apparatus sets, via a setting unit and as temporary identification information for performing communication with other communication terminal apparatuses ( | 05-06-2010 |
| 20100142418 | DATA COMMUNICATION SYSTEM, DATA COMMUNICATION REQUEST DEVICE, AND DATA COMMUNICATION RESPONSE DEVICE - The object of the present invention is to provide a data communication system in which a communication scheme is switched without a decrease in communication efficiency. | 06-10-2010 |
| 20100238848 | Class-B transmitter and replica transmitter for gigabit ethernet applications - A method and apparatus for a Gigabit Ethernet transceiver that has a Class-B amplifier in a main transmitter for higher efficiency and power handling capabilities. The output current of the main transmitter is produced by a reference voltage applied across a resistor, where the reference voltage generator, resistor and amplifier are fabricated on the same substrate, such that the output current is constant across process voltage and temperature. The transceiver also has a replica transmitter whose signal is used to cancel the main transmitter signal at the input of the receiver section of the transceiver. The replica transmitter is fabricated on the same substrate as the main transmitter, such that its output signal reflects non-linearities in the main transmitter across process voltage and temperature. | 09-23-2010 |
| 20110007674 | METHOD FOR ALLOCATING PHYSICAL HYBRID ARQ INDICATOR CHANNELS - The present disclosure provides a method for allocating physical hybrid ARQ indicator channels, which is used for sending indication information corresponding to multiple uplink sub-frames in the same downlink sub-frame in a TDD system. The method includes: in the TDD system, through an index of a physical resource block where uplink data resides as well as an index of an uplink sub-frame where the uplink data resides, determining an index of a physical hybrid ARQ indicator channel group where a physical hybrid ARQ indicator channel in an downlink sub-frame resides and an intra-group index of the physical hybrid ARQ indicator channel in the physical hybrid ARQ indicator channel group according to an indexing rule, and further determining an index of the physical hybrid ARQ indicator channel by using the index of the physical hybrid ARQ indicator channel group and the intra-group index. According to implicit mapping, the method of the present disclosure implements the allocation of the physical hybrid ARQ indicator channels over which the downlink indication messages corresponding to each uplink sub-frame are transmitted, thereby being capable of overcoming the problem potentially present in existing technologies that multiple indication messages reside on the same physical hybrid ARQ indicator channel. | 01-13-2011 |
| 20110158137 | Receiver Based Power Efficient Transmitter for Ethernet - Systems and methods are used to adjust, e.g., reduce, current driving a transmitter, i.e., to reduce transmitter power consumption, based on an actual value of a received signal from received along a cable. For example, this is very beneficial to an Ethernet system where the received signal is attenuated by the lossy cable. In this case, the transmitter power consumption can be lowered during a normal application where data is transmitted and received through the cable. | 06-30-2011 |
| 20110182216 | INTERFACE DEVICE, COMMUNICATIONS SYSTEM, NON-VOLATILE STORAGE DEVICE, COMMUNICATION MODE SWITCHING METHOD AND INTEGRATED CIRCUIT - An interrupt request cannot be transmitted while a data read command or a data write command transmitted from a host device to a slave device is being processed in a half-duplex mode. Disclosed are a host device and a slave device that are set to a full-duplex mode by temporarily switching the communication direction of a first transmission channel or a second transmission channel after completing transmission and reception of a predetermined number of data packets in the half-duplex mode. The host device or the slave device can thus transmit an interrupt request, such as a request associated with a wait status or a busy status, to its communication target using the temporary full-duplex mode. This enables the host device or the slave device to process such an interrupt request during high-speed data transfer performed in the half-duplex mode. | 07-28-2011 |
| 20110235557 | SELF-MATCHED BAND REJECT FILTER - The present application describes a radio frequency band reject filter including an input port, an output port, a plurality of acoustic resonators and an inductor for matching the impedance of the plurality of acoustic resonators. The inductor is positioned within the band reject filter in respect of the plurality of acoustic resonators such that a static capacitance between the input port and the inductor is substantially equivalent to a static capacitance between the output port and the inductor. The plurality of acoustic resonators may be a plurality of parallel resonators, a plurality of series resonators or a combination of series and parallel resonators. The radio frequency band reject filter is fabricated using any of surface acoustic wave (SAW) technology, thin film bulk acoustic resonator (FBAR) technology, and bulk acoustic wave (BAW) technology. | 09-29-2011 |
| 20130021953 | FULL-DUPLEX SINGLE-ENDED SERIAL LINK COMMUNICATION SYSTEM - A system for full duplex communication using a single-ended communications link is described. The system includes a first link interface configured to generate a signal for transmission via the single-ended communications link. The signal includes data encoded in a forward channel. The system also includes a second link interface configured to receive the signal from the first link interface via the single-ended communications link and modulate the signal to encode data in a reverse channel so that the signal includes the forward channel data and the reverse channel data simultaneously. | 01-24-2013 |
| 20130114480 | Time Domain Duplex Between CMTS and Cable Modems - A time domain duplex cable system includes a mechanism to change the communication direction of spectrum used in a cable plant including a Cable Modem Termination System (CMTS), a Fiber Node and a plurality of cable modems in communication with the CMTS via the Fiber Node. Active devices, e.g., directional amplifiers switch the communication direction of the cable plant in response to timing information received from the CMTS. To avoid collisions of downstream and upstream packets, a guard time is determined and used in connection with generating the timing information. In one embodiment, the timing information is transmitted in one or more Data Over Cable Service Interface Specifications (DOCSIS) Media Access Protocol (MAP) messages transmitted by the CMTS towards the cable modems. | 05-09-2013 |
| 20130272176 | HIGH-FREQUENCY MODULE - In a high-frequency module, first, second and third duplexers are aligned and mounted on a top surface of a multilayer body. The second duplexer, the frequency band of which is spaced apart from those of the first duplexer and the third duplexer, is arranged between the first duplexer and the third duplexer, the frequency bands of which are close to each other. This causes the spacing between the first and third duplexers, the frequencies of signals transmitted and received through which are close to each other, to be increased to suppress or prevent unnecessary electromagnetic field coupling between the first and third duplexers. In addition, also with the second duplexer, the frequency band of which is spaced apart from those of the first and third duplexers and which exists between the first and third duplexers, the unnecessary electromagnetic field coupling is suppressed or prevented between the first and third duplexers. | 10-17-2013 |
| 20150016319 | METHOD AND SYSTEM FOR AN EXTENDED RANGE ETHERNET LINK DISCOVERY SIGNALING - Aspects of a method and system for extended range Ethernet link discovery signaling are provided. A local PHY may detect of one or more active twisted-pair wires in a remote PHY in extended range applications. The local PHY may determine whether to operate as a master or slave based on detected pairs. When operating as a master device, the local PHY may correct twisted-pair wire swap information received from the remote PHY before communicating an encoded link length value to the remote PHY. When operating as a slave device, the local PHY may transmit encoded twisted-pair wire swap information to the remote PHY before recovering a link length value communicated from the remote PHY. The local PHY may communicate supported operating modes based on the link length value to the remote PHY. Moreover, the local PHY may enable establishing a common full duplex operating mode with the remote PHY. | 01-15-2015 |
| 20150131497 | COMBINED FLOW AND LOW-POWER STATE CONTROL USING SAME LINES BETWEEN INTERFACES - A method for controlling a low-power state of a pair of serial interfaces using a pair of flow-control signal lines may include enabling a first of the flow-control lines by a first one of the interfaces for signaling a transmission request to the second interface. The method may also include, in response to the transmission request, waking up to a live state from a low-power state and enabling a second flow-control line for signaling a transmission authorization to the first interface. In response to the transmission authorization, the method may include initiating a transmission of a message to the second interface, and upon reaching an offset before the end of the message transmission, disabling the first flow-control line by the first interface. The method may also include, at the end of the message transmission, disabling the second flow-control line and going back into the low-power state. | 05-14-2015 |
| 20150146589 | FEED-FORWARD CANCELLER - A feed-forward cancellation system includes a transmitting element and a receiving element. The transmitting element is in electrical communication with a transmitting line. The transmitting element is configured output a transmission signal to the transmitting line. The receiving element is in electrical communication with a receiving line. The receiving element is configured to process a response signal that is generated in response to the transmission signal and that is delivered to the receiving line. At least one antenna is configured to transmit the transmission signal, receive the response signal generated based on the transmission signal, and deliver the response signal to the receiving line. The feed-forward cancellation system further includes an electronic cancellation unit configured to generate a cancellation signal based on the transmission signal. The cancellation signal eliminates saturation from at least one of the response signal and the receiving line. | 05-28-2015 |
| 20160127116 | ELECTRONIC DEVICE, METHOD AND SYSTEM FOR HALF DUPLEX DATA TRANSMISSION - An electronic device and method for half duplex data transmission in a long range keyless entry and go system, and more specifically to an RFID transponder, a corresponding read/write (R/W) unit and methods for operating the RFID transponder and the R/W-unit. There is a first coil, a second coil and a third coil, being arranged as a three-dimensional antenna, a first capacitor, a second capacitor and a third capacitor couplable in parallel to the first coil, the second coil and the third coil, respectively, for selectively forming a first, a second and a third parallel-resonant circuit for receiving radio signals, a series-resonant circuit for transmitting radio signals and a control stage configured to either use one of the first, second or third parallel-resonant circuits for receiving radio signals or the series-resonant circuit for transmitting signals. | 05-05-2016 |
| 20160380176 | ACOUSTIC WAVE ELEMENT, DUPLEXER AND COMMUNICATION DEVICE - An elastic wave element has a piezoelectric substrate; an excitation electrode which is located on an upper surface of the piezoelectric substrate and generates an acoustic wave, and two reflectors which are located on the upper surface of the piezoelectric substrate and sandwich the excitation electrode in the propagation direction of the acoustic wave. The excitation electrode has a main region located between the two end parts of the propagation direction and outer regions located on two sides of the main region. When the number of the electrode fingers of the outer region is “m”, an electrode finger interval of the main region is “a”, and an interval between the electrode finger of the main region on the outer region side and the reflector electrode finger of the reflector is “x”, 0.5×a×(m+1)| 12-29-2016 | |
| 20160380653 | ENERGY EFFICIENT POLYNOMIAL KERNEL GENERATION IN FULL-DUPLEX RADIO COMMUNICATION - A polynomial kernel generator is configured to mitigate nonlinearity in a receiver path from a transmitter path comprising a nonlinear component in a communication device or system. The polynomial kernel generator operates to generate polynomial kernels that can be utilized to model the nonlinearity as a function of a piecewise polynomial approximation applied to a nonlinear function of the nonlinearity. The polynomial kernel generator generates kernels in a multiplier less architecture with polynomial computations in a log domain using a fixed number of adders. | 12-29-2016 |
| 370284000 | Differential | 6 |
| 20090086654 | SINGLE STACK COUPLED RESONATORS HAVING DIFFERENTIAL OUTPUT - An acoustic resonator and a communication device with an acoustic resonator are described. | 04-02-2009 |
| 20090147708 | TIME SHARED BI-DIRECTIONAL SERIAL SIGNALING SYSTEM - A time shared bi-directional serial signaling system providing a differential signal with apparent duplex signal operation for higher and lower bandwidth data signals in a forward direction and another lower bandwidth data signal in a return direction. | 06-11-2009 |
| 20100322120 | ADAPTIVE ELECTRONIC TRANSMISSION SIGNAL CANCELLATION APPARATUS FOR FULL DUPLEX COMMUNICATION - An adaptive electronic transmission signal cancellation circuit for separating transmit data from receive data in a bidirectional communication system operating in full duplex mode is disclosed. The output of a main transmitter responsive to a first bias current is connected to the output of a receiver through an internal resistor. A first replica transmitter responsive to a second bias current and matched to the main transmitter current gain and rise/fall time characteristics is connected to the input terminal of the receiver, and produces a cancellation voltage between the output terminal of the main transmitter and the input terminal of the receiver as a function of the second bias current and the internal resistor. A second replica transmitter matched to the current gain and rise/fall time characteristics of the main transmitter and the first replica transmitter and responsive to the second bias current is connected to the output terminal of the main transmitter for canceling excess current, developed by the first replica transmitter, at the output terminal of the main transmitter. | 12-23-2010 |
| 20120155342 | HYBRID FREQUENCY COMPENSATION NETWORK - Hybrid frequency compensation is provided. Hybrid circuits are used to subtract the transmit signal from the receive signal in a full duplex communication system. Since the hybrid circuit and the main line driver are exposed to different loads, accurate subtraction is difficult to achieve. A frequency dependent network is used to match the loading seen by the driver and the hybrid. The compensation network can be based on active and/or passive components. | 06-21-2012 |
| 20150071136 | Full-Duplex Driver with Hybrid Adaptation - A system includes a full-duplex driver to drive signals on a load. A hybrid element connected with the full-duplex driver controls a flow of transmission and receipt of the signals. A gain control element connected with the full-duplex driver tunes a transconductance of the full-duplex driver to match an impedance of the load. The controlled gain is based on a leakage voltage value of the full-duplex driver. | 03-12-2015 |
| 20150381391 | POWER LINE COMMUNICATION SYSTEM AND MASTER COMMUNICATION DEVICE - A power line communication system includes a master side transceiver of a master communication device, a slave side transceiver of a slave communication device, a power wire, and a ground wire. The master communication device includes a voltage changeover portion changing supply voltage in steps. The master side transceiver is connected to the slave side transceiver through the power wire and the ground wire. The slave side transceiver transmits first information to the master side transceiver by a differential transmission. The voltage changeover portion changes the supply voltage so as the master side transceiver to transmit second information to the slave side transceiver. A master communication device includes a master side transceiver and a voltage changeover portion. | 12-31-2015 |
| 370285000 | Bridge | 2 |
| 20100142419 | BI-DIRECTIONAL BRIDGE CIRCUIT HAVING HIGH COMMON MODE REJECTION AND HIGH INPUT SENSITIVITY - A bidirectional communications interface is provided that connects a transmitter and a receiver, or a transceiver, to a transmission line. Under an embodiment, the bidirectional interface generates positive and negative polarity data signals using two separate differential amplifiers that receive differential signal pairs from each side of a differential link to the transmission line and the transmitter. The bidirectional interface controls common mode rejection in each of the separate differential amplifiers using bias signals generated in response to an output common mode feedback voltage from each of the differential amplifiers. An output amplifier combines the positive and negative polarity data signals to form single-ended output logic signals. The output logic signals represent data received on the transmission line, and are provided to the receiver. | 06-10-2010 |
| 20100226294 | Full duplex network radio bridge with low latency and high throughput - A full duplex radio bridge using two transceivers coupled to a first packet network, one for transmitting data toward another radio bridge coupled to a second packet network, and the other for receiving data transmitted from the first packet network toward said second packet network by a transceiver of the other radio bridge. Each radio bridge is coupled to its packet network through one network port whose transmit data path is coupled to one of the transceivers, and whose receive data path is coupled to receive data from the other transceiver. An inner loop and outer loop is used. Management packets are routed to the various transceivers using the inner loop and outer loop by routing and filtering functions. Payload packets are transmitted from one packet network to the other using only the outer loop. | 09-09-2010 |
| 370286000 | Echo suppression or cancellation | 37 |
| 20080310330 | 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 one equalizer. The operation of the startup protocol is partitioned into three stages. During the first stage the timing recovery system and the equalizer of the slave are trained and the noise reduction system of the master is trained. During the second stage the timing recovery system of the master is trained in both frequency and phase, the equalizer of the master is trained and the noise reduction system of the slave is trained. During the third stage the noise reduction system of the master is retrained, the timing recovery system of the master is retrained in phase and the timing recovery system of the slave is retrained in both frequency and phase. The protocol then enters a fourth stage in which the master transceiver and the slave transceiver are ready to communicate with each other. | 12-18-2008 |
| 20090022074 | Echo canceller with interference-level controlled step size - Echo canceling method comprising the steps: a) receiving a first signal and a second signal, said second signal comprising an echo of the first signal, b) generating an echo replica signal by filtering the first signal with a finite impulse response filter, said finite impulse filter using a filter coefficient vector for generating the echo replica signal, generating an echo cancelled signal by subtracting the echo replica signal from the second signal, d) determining a measure of interference within the second signal, e) determining a step vector depending on said measure of interference, wherein increasing the measure of interference continuously reduces a size of the step vector, and f) updating the filter coefficient vector by the step vector. | 01-22-2009 |
| 20090022075 | SELECTIVELY ADAPTABLE FAR-END ECHO CANCELLATION IN A PACKET VOICE SYSTEM - A packet voice transceiver adapted to reside at a first end of a communication network and to send an ingress communication signal comprising voice packets to, and receive an egress communication signal comprising voice packets from, a second packet voice transceiver residing at a second end of the communication network. The packet voice transceiver includes a far-end echo canceller that reduces echo that is present in the egress communication signal. The far-end communicates with other functional components of the transceiver system and cancels echo or refrains from canceling echo based on the activity of the other functional components. | 01-22-2009 |
| 20090059821 | ACOUSTIC ECHO CANCELLATION BASED ON NOISE ENVIRONMENT | 03-05-2009 |
| 20090067353 | SYSTEM AND METHOD FOR DETECTING ANOMALIES ALONG TELECOMMUNICATION LINES - An anomaly detection system comprises an echo canceler and anomaly detection logic. The echo canceler has a plurality of taps respectively associated with a plurality of tap coefficients. The anomaly detection logic is configured to determine a difference between a new tap coefficient associated with one of the taps and a previous tap coefficient associated with the one tap. The anomaly detection logic is configured to perform a comparison between the difference and a threshold and to detect an anomaly along a telecommunication line based on the comparison. | 03-12-2009 |
| 20090073903 | Echo cancellation - Embodiments related to echo compensation have been described and depicted. | 03-19-2009 |
| 20090154380 | Echo Cancellation For A Packet Voice System - An apparatus and methods supporting improved echo cancellation in a packet network is disclosed. An embodiment of the present invention may permit a split-band communication system operating in a narrowband mode to provide improved suppression of hybrid echo generated by the conversion of signals from a packet network to a two-wire analog circuit. By detecting the presence of signal characteristics outside of the relatively narrower bandwidth to be communicated, such an embodiment may more accurately detect the occurrence of speech received from a party on a relatively wider bandwidth communication circuit. The accurate detection of speech permits more effective suppression of any hybrid echo remaining after echo cancellation. An embodiment of the present invention may also have application in other systems that detect signals received via a path having a bandwidth greater than that to be transmitted. | 06-18-2009 |
| 20090154381 | ADAPTIVE ELECTRONIC TRANSMISSION SIGNAL CANCELLATION APPARATUS FOR FULL DUPLEX COMMUNICATION - An adaptive electronic transmission signal cancellation circuit for separating transmit data from receive data in bidirectional communication system operating in full duplex mod is disclosed. The output of a main transmitter responsive to a first bias current is connected to the output of a receiver through an internal resistor. A first replica transmitter responsive to a second bias current and matched to the main transmitter current gain and rise/fall time characteristics is connected to the input terminal of the receiver, and produces a cancellation voltage between the output terminal of the main transmitter and the input terminal of the receiver as a function of the second bias current and the internal resistor. A second replica transmitter matched to the current gain and rise/fall time characteristics of the main transmitter and the first replica transmitter and responsive to the second bias current is connected to the output terminal of the main transmitter for canceling excess current, developed by the first replica transmitter, at the output terminal of the main transmitter. | 06-18-2009 |
| 20090168672 | METHODS AND APPRATUS FOR SIGNAL ECHO CANCELLATION AND TRANSMITTER CALIBRATION IN FULL DUPLEX SYSTEMS - A method includes transmitting a first signal over a network from a first communication link to a second communication link. The method further includes receiving a second signal with the first communication link from the second communication link. The method further includes canceling signal echo from the first signal present in the second signal with a digital echo canceller. The method further includes providing correction data from a memory array to the digital echo canceller during the cancellation of the signal echo. An associated apparatus is also disclosed. | 07-02-2009 |
| 20090168673 | METHOD AND APPARATUS FOR DETECTING AND SUPPRESSING ECHO IN PACKET NETWORKS - The invention includes a method and apparatus for detecting and suppressing echo in a packet network. A method according to one embodiment includes extracting voice coding parameters from packets of a reference packet stream, extracting voice coding parameters from packets of a target packet stream, determining whether voice content of the target packet stream is similar to voice content of the reference packet stream by processing the voice coding parameters of the reference packet stream and the voice coding parameters of the target packet stream, and determining whether the target packet stream includes an echo of the reference packet stream based on the determination as to whether the voice content of the target packet stream is similar to voice content of the reference packet stream. | 07-02-2009 |
| 20090238102 | Generating an estimated non-linear echo signal - Embodiments of a method and apparatus for generating an estimated non-linear echo signal are disclosed. One method includes receiving a plurality of data inputs. The plurality of data inputs are partitioned into subsets. A weight vector is computed for each of the subsets. A vector of addresses to memory locations is computed for each of the subsets. Values of interpolants are accessed at the memory locations (interpolation sites) based on the vector of addresses for each of the subsets. The estimated non-linear echo signal based is calculated on the values of the interpolants and the weight vector corresponding to each subset. | 09-24-2009 |
| 20090268646 | Line Driver For An Adaptive Hybrid Circuit - A second output transmission signal (“TX | 10-29-2009 |
| 20090296610 | VOICE PACKET DYNAMIC ECHO CANCELLATION SYSTEM - A voice packet dynamic echo cancellation system includes an input/output unit configured to communicate over a packet network and a storage unit configured to store network performance information associated with node segments on the packet network. The system also includes a processing unit in communication with the input/output unit and the storage unit and configured to: set-up a call from an originating call device to a terminating call device; determine the network performance of the call between the originating call device and the terminating call device; locate an echo signal of the call to the originating call device based on the network performance; produce a echo cancellation signal based on the echo signal; and cancel the echo signal with the echo cancellation signal. | 12-03-2009 |
| 20090323566 | ALL-DIGITAL TIMING CONTROL FOR MULTI-CHANNEL FULL-DUPLEX TRANSCEIVER - A multi-channel full-duplex transceiver is disclosed. The transceiver comprises: a clock generator for generating a first clock and a second clock based on a control code; a plurality of transmitters for transmitting a plurality of outgoing signals onto a plurality of channels, respectively; a plurality of receivers for receiving, sampling, and equalizing in parallel a plurality of incoming signals from said plurality of channels, respectively, to generate in parallel a plurality of equalized signals, respectively; a symbol-rate-converters for converting in parallel said equalized signals into a plurality of refined signals, respectively. In a first operation mode, the control code is established by detecting a timing difference between an output clock of the clock generator and a reference clock. In a second operation mode, the control code is established by detecting a timing embedded in one of said refined signals. | 12-31-2009 |
| 20100278085 | DUPLEXER AND SWITCH ENHANCEMENT - A signal selector enhancer suitable for portable electronic devices and base stations is disclosed. In one embodiment, the enhancer can include: a filter for receiving a signal from a first node, and for providing a filtered signal output therefrom, where the first node is coupled to a signal selector; and a noise canceller for receiving the filtered signal output, and for providing an adjusted filtered signal at a second node, where the second node is coupled to the signal selector, and where an operation of the signal selector is enhanced by the filter and the noise canceller arrangement. | 11-04-2010 |
| 20110013544 | SYSTEMS AND METHODS FOR FACSIMILE ECHO CANCELLATION - The present invention is related to methods and systems for reducing or canceling echoes during fax communications. In an embodiment, during a fax call, a first fax signal from a first fax device intended for a second fax device is detected. Based at least in part on detecting the first fax signal from the first fax device or on the termination of the first fax signal, an echo audio packet is muted, wherein the echo audio packet is at least partly the result of the first fax signal being transmitted over a network, the network including at least a data network. | 01-20-2011 |
| 20110019598 | Systems, Circuits and Methods for Dual Transformer Duplexing - A circuit for the analog correlation of a signal to remove impairments such as echo, cross talk and intersymbol interference is described. A duplexing circuit which improves echo response by providing a second transformer is described. | 01-27-2011 |
| 20110149815 | METHOD AND APPARATUS FOR PROVIDING ECHO CANCELLATION IN A NETWORK - A method and apparatus for providing echo cancellation are disclosed. For example, the method receives via an echo canceller a first audio signal directed towards an endpoint device, and adds an inserted signal to the first audio signal directed towards the endpoint device. The method determines if a second audio signal being received from the endpoint device comprises the inserted signal, and cancels at least a portion of the second audio signal that is associated with the first audio signal, if the inserted signal is detected. | 06-23-2011 |
| 20110222446 | ECHO CANCELLATION CIRCUIT - An echo cancellation circuit in a full duplex two-way communication system comprising: an input/output terminal; a subtractor having a positive and a negative input terminals, in which a first transmission signal is inputted to the negative input terminal as a pseudo echo signal, the first transmission signal is inputted through an output buffer to the positive input terminal as an echo signal, the pseudo echo signal inputted to the negative input terminal is subtracted from the echo signal inputted to the positive input terminal; and a result of the subtraction is outputted; and an echo cancellation error reducing unit having a D/A converter at an input side or an output side of the subtractor. | 09-15-2011 |
| 20120140685 | SIMPLIFIED ADAPTIVE FILTER ALGORITHM FOR THE CANCELLATION OF TX-INDUCED EVEN ORDER INTERMODULATION PRODUCTS - One embodiment of the present invention relates to an adaptive filtering apparatus comprising first and second real valued adaptive filters, respectively configured to receive an adaptive filter input signal based upon a transmission signal in a transmission path. The first real valued adaptive filter is configured to operate a real valued adaptive filter algorithm on the input signal to estimate a first intermodulation noise component (e.g., an in-phase component) in a desired signal and to cancel the estimated noise. The second real valued adaptive filter is configured to operate a real valued adaptive filter algorithm on the input signal to estimate a second intermodulation noise component (e.g., a quadrature phase component) in the desired signal and to cancel the estimated noise. Accordingly, each filter operates a real valued adaptive algorithm to cancel a noise component, thereby removing complex cross terms between the components from the adaptive filtering process. | 06-07-2012 |
| 20120281603 | Transmit Phase Control for the Echo Cancel Based Full Duplex Transmission System - A network component comprising a transmitter configured to transmit data at a transmitter phase, a receiver configured to receive data at a receiver, and a phase delay component coupled to the transmitter and the receiver and configured to control the transmitter phase relative to the receiver phase to maintain distortion in the transmitted data below a threshold, wherein the threshold is less than a maximum possible distortion in the transmitted data. | 11-08-2012 |
| 20120320807 | DUPLEX AUDIO FOR MOBILE COMMUNICATION DEVICE AND ACCESSORY - Duplex audio is provided for a mobile communication device and an accessory. In some embodiments, the accessory can selectably operate in a duplex audio mode, concurrently sending audio to and receiving audio from the mobile communication device, or in another audio mode. In duplex audio mode, the accessory can enable its internal audio processing operations (e.g., echo cancellation) while the mobile communication device disables its corresponding internal operations or vice versa. The mobile communication device can control when the accessory transitions into and/or out of duplex audio mode. | 12-20-2012 |
| 20150049656 | IMPEDANCE ADJUSTMENT METHOD, DELAY CAPACITANCE ADJUSTMENT METHOD AND ASSOCIATED APPARATUS FOR COMMUNICATION DEVICE - An impedance adjustment method for a communication device, wherein the communication device has a plurality of impedance paths for selection, includes: selecting an initial impedance path; and utilizing a predetermined algorithm to examine a portion of the plurality of impedance paths by starting from the initial impedance path for selecting an optimized impedance path for the communication device. A delay capacitance adjustment method for a communication device, wherein the communication device has a plurality of delay capacitance paths for selection, includes: selecting an initial delay capacitance path; and utilizing a predetermined algorithm to examine a portion of the plurality of delay capacitance paths by starting from the initial delay capacitance path for selecting an optimized delay capacitance path of the communication device. | 02-19-2015 |
| 20150098373 | Processing Method Based On OFDM-TDMA Two-Way Service and Communications Device - The present invention provides a processing method based on an OFDM-TDMA two-way service and a communications device. The method includes assigning timeslots in a TDMA frame structure to multiple users in a TDMA manner, so that each user has a different timeslot, and each timeslot of the users is simultaneously used for uplink and downlink communication. The methods further includes simultaneously sending a local-end OFDM signal and receiving a remote-end OFDM signal in each timeslot of the users, and cancelling, in an OSD manner, interference caused by an echo OFDM signal, which is produced according to the local-end OFDM signal, to the remote-end OFDM signal, where a spectrum of the echo OFDM signal and a spectrum of the remote-end OFDM signal overlap. | 04-09-2015 |
| 20160156381 | LEAKAGE CANCELLATION A MULTIPLE-INPUT MULTIPLE-OUTPUT TRANSCEIVER | 06-02-2016 |
| 20160164572 | Electrical Duplex to Optical Conversion - A device converts between electrical duplex and optical signals. In one embodiment, such a device includes an echo cancellation circuit that reduces the echo from an incoming optical signal. | 06-09-2016 |
| 20170237464 | Calibration for Echo Cancellation in a Full Duplex Communication System | 08-17-2017 |
| 370287000 | Disabling or inhibiting | 2 |
| 20090207763 | VOICE SWITCHING FOR VOICE COMMUNICATION ON COMPUTERS - A voice communication end device performs quality checks to determine whether acoustic echo cancellation would be ineffective, such as due to noise or clock drift or discontinuities between incoming and outgoing voice channels. In the case where echo cancellation would prove ineffective, the device falls back on a tri-state voice switching operation that includes a bi-direction state in which both channels are on in full duplex operation, which provides a smoother transition switching between active channels. The tri-state voice switching supports both voluntary transitions where the active user voluntarily stops to yield the active channel, and forced transitions where the active user is forcedly interrupted by the other user speaking more loudly. | 08-20-2009 |
| 20140348043 | METHOD FOR COMMUNICATING BETWEEN AT LEAST ONE FIRST SYSTEM AND AT LEAST ONE SECOND SYSTEM - The invention relates to a method for communicating between at least one first system ( | 11-27-2014 |
| 370288000 | Using an attenuator | 1 |
| 20110274017 | VERSATILE SYSTEM FOR TRANSCEIVER NOISE REDUCTION IN A TIME-DIVISION DUPLEXING WIRELESS NETWORK - A system for suppressing transmission channel noise in a signal transmission/reception device—particularly a time division duplex (TDD) wireless communications device—is provided. The system provides one or more shunt elements, instantiated at some point along the device's signal transmission channel. One or more attenuation elements are also instantiated at some point along the signal transmission channel, as are one or more disabling elements. A trigger signal indicates when the device is shifting from signal transmission operation (or mode) to signal reception operation. Responsive to assertion of the trigger signal, the shunt, attenuation and disabling elements are activated. | 11-10-2011 |
| 370290000 | Using a particular adaptive filter | 7 |
| 20080198778 | AUDIO COMMUNICATION DEVICE AND METHODS FOR REDUCING ECHOES BY INSERTING A TRAINING SEQUENCE UNDER A SPECTRAL MASK - Embodiments of an audio communication device and methods for reducing echoes are generally described herein. Other embodiments may be described and claimed. In some embodiments, echo-reduction circuitry may insert a training signal into digital audio signals at or below a noise floor and in a non-audible portion of the frequency spectrum based on a spectral mask. The training signal may be generated from a spectrum estimate and a training sequence. An adaptive filter may generate an echo-cancellation signal using filter coefficients generated from the training sequence and return-path signals. The echo-cancellation signal may remove echo signals from the return-path signals. | 08-21-2008 |
| 20080198779 | MULTI-CHANNEL COMMUNICATION DEVICE AND METHODS FOR REDUCING ECHOES BY INSERTING A TRAINING SEQUENCE UNDER A SPECTRAL MASK - Embodiments of a multi-channel audio communication device and methods for reducing echoes are generally described herein. Other embodiments may be described and claimed. In some embodiments, echo-reduction circuitry may insert training signals into digital audio signals at or below a noise floor and in a non-audible portion of the frequency spectrum based on a spectral mask. Training signals may be generated from spectrum estimates and training sequences. An adaptive filter may generate echo-cancellation signals using filter coefficients generated fawn the training sequences and return-path signals. The echo cancellation signals may remove echo signals from the return-path signals. | 08-21-2008 |
| 20080259828 | Method and apparatus for reducing timestamp noise in audio echo cancellation - A communication end device of a two-way communication system is shown. The device includes an audio signal capture device for capturing local audio to be transmitted to another end device, an audio signal rendering device for playing remote audio received from the other end device, and buffers for buffering the captured and rendered audio signals. The device also includes an audio echo canceller operating to predict echo from the rendered audio signal at a calculated relative offset in the captured audio signal based on an adaptive filter, and subtract the predicted echo from the signal transmitted to the other end device The calculated relative offset that is used by the audio echo canceller for a current signal sample is adjusted if a difference between it and an adjusted relative offset of a preceding sample exceeds a threshold value. | 10-23-2008 |
| 20090028075 | FULL-DUPLEX COMMUNICATION DEVICE AND METHOD OF ACOUSTIC ECHO CANCELLATION THEREIN - The invention provides a full-duplex communication device. In one embodiment, the full-duplex communication device comprises a first adaptive filter, a second adaptive filter, a channel decoupling module, and a frequency processing module. The first adaptive filter having a first tap length filters out echoes of a far-end talker from a first near-end signal carrying voices of a near-end talker according to a far-end signal carrying voices of the far-end talker to obtain a second near-end signal. The second adaptive filter having a second tap length less than the first tap length filters out echoes of the far-end talker from the first near-end signal according to the far-end signal to obtain a third near-end signal. The channel decoupling module processes the second near-end signal to generate a fourth near-end signal and subtracts the second near-end signal from the third near-end signal to obtain a fifth near-end signal. Finally, the frequency processing module cancels echoes of the far-end talker from the fourth near-end signal in frequency domain according to the fifth near-end signal to obtain a six near-end signal. | 01-29-2009 |
| 20100165895 | METHODS AND APPARATUS FOR CANCELING DISTORTION IN FULL-DUPLEX TRANSCEIVERS - Methods and apparatus for canceling distortion in full-duplex transceivers are disclosed. Some example methods to reduce distortion in a full-duplex transceiver include generating a first digital signal, generating a first analog signal based on the first digital signal for transmission over a full-duplex channel, receiving a second analog signal via the full-duplex channel, and generating a second digital signal based on the second analog signal, wherein the second digital signal includes coupling distortion based on the first analog signal. The example methods further include generating an adaptive filter signal based on the first digital signal, and reducing the coupling distortion from the second digital signal by subtracting the adaptive filter signal from the second digital signal. | 07-01-2010 |
| 20110044216 | Systems, circuits and methods for an analog echo canceller with interpolating output - A method and system are described for canceling an echo signal in analog domain with adaptive filters working in digital domain. In one embodiment a system includes an analog-to-digital converter (ADC) sampling at two different phases to generate a first error signal and a second error signal having different phases. The ADC operates at a frequency significantly lower than the frequency at which the individual filters run. The first adaptive filter unit and a second adaptive filter unit are independently trained with the first and second error signals. respectively. The first and second adaptive filter units generate echo estimate signals used to cancel the echo signal. | 02-24-2011 |
| 20150078226 | FILTER ENHANCER AND METHOD - A filter enhancer provides greater performance in a passive filter. The passive filter has an input terminal for receiving a signal in a first frequency band and an output terminal for providing a signal in a second frequency band. The filter enhancer includes: (a) a first canceller circuit coupled between input terminal and output terminal, the first canceller circuit including a first finite impulse response (FIR) filter for attenuating signals in the first frequency band; and (b) a control circuit coupled to output terminal and first canceller circuit for providing adaptive coefficients for configuring the first FIR filter. The first FIR filter may be implemented by either a digital FIR filter or an analog FIR filter. The filter enhancer may further include a second canceller circuit coupled between input terminal and output terminal, the second canceller circuit including a second FIR filter for attenuating signals in the second frequency band. | 03-19-2015 |
