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| Number | Title | Issue Date |
| 7358875 | Echo preventing circuit and digital signal processing circuit An echo preventing circuit comprises a filter that is inputted with a first digital signal and outputs a second and a third digital signals; a first DA converter that converts the second digital signal into a first analog signal and outputs the first analog signal; ... | 04/15/2008 |
| 7349353 | Techniques to reduce echo Briefly, techniques to control echo that utilize fixed and adaptive filters are described. ... | 03/25/2008 |
| 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 |
| 7302235 | Synchroniser A synchroniser for use in a receiver which receives signals, wherein the synchronizer provides a digital control signal, the control signal defining a plurality of different levels; controls the level provided by successive ones of the control signals, successive on... | 11/27/2007 |
| 7280493 | Method for hardware reduction in echo canceller and near-end crosstalk canceller The present invention provides a method for hardware reduction in the echo canceller and the near-end crosstalk canceller. The method applies an N (N is a positive integer) times divide frequency sampling operation onto the input data list of the echo canceller firs... | 10/09/2007 |
| 7256645 | Suppression of noise in an integrated circuit Sub-circuits of an integrated circuit can act as noise sources on common conductors such as power supply lines and the substrate. Each of these conductors may act as a noise medium capable of transferring noise signals from the noise source to other sub-circuits. On... | 08/14/2007 |
| 7251213 | Method for remote measurement of echo path delay A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can b... | 07/31/2007 |
| 7242762 | Monitoring and control of an adaptive filter in a communication system A communication system having an echo canceller is disclosed. One embodiment of the echo canceller includes an adaptive filter used to provide an estimate of reflected echo which is removed from the send signal. The echo canceller may also include a near-end talker ... | 07/10/2007 |
| 7215765 | Method and apparatus for pure delay estimation in a communication system A communication system having an echo canceller is disclosed. One embodiment of the echo canceller includes an adaptive filter used to provide an estimate of reflected echo which is removed from the send signal. The echo canceller may also include a near-end talker ... | 05/08/2007 |
| 7212841 | Telephone apparatus and a communication method using such apparatus In accordance with a first aspect of the present invention there is provided a telephone apparatus including a transmitter portion and a receiver portion, an input transducer for converting input audio signals into electrical signals, a connectable input link betwee... | 05/01/2007 |
| 7190718 | Method and apparatus for determining a receiver sampling phase for use in diagnosing a channel An apparatus for processing a received signal includes an analog-to-digital converter (ADC) configured to produce a sampled signal from a received signal using a candidate sampling phase. An adaptive filter includes adaptive filter coefficients and is configured to ... | 03/13/2007 |
| 7173962 | High-speed modem with uplink remote-echo canceller A high-speed modem operates at speeds as high as 64 kbps in both the downlink direction from a digital modem to an analog subscriber and at an increased speed in the uplink direction from the analog subscriber back to the digital modem. Known systems provide a 56 kb... | 02/06/2007 |
| 7171003 | Robust and reliable acoustic echo and noise cancellation system for cabin communication A cabin communication system for improving clarity of a voice spoken within an interior cabin having ambient noise includes an adaptive speech enhancement filter for receiving an audio signal that includes a first component indicative of the spoken voice, a second c... | 01/30/2007 |
| 7164662 | Network delay identification method and apparatus Network delay is determined in order to synchronize a clock in a mobile station with a reference clock. Tone are generated that represent a sequence of bits in a synchronization flag. The tones are sampled beginning at a selected sample start time. The sampled tones... | 01/16/2007 |
| 7161528 | Device and method for the suppression of pulsed wireless signals The invention relates to a method of suppressing pulsed signals in particular of DME or TACAN type present in the radio signals received (Ue) by a radio-frequency receiver, characterized in that the reception frequency band of the receiver is divided into frequency ... | 01/09/2007 |
| 7151828 | Circuit arrangement for the analogue suppression of echoes A circuit arrangement for the analogue suppression of echoes, as in particular can be used in a hybrid-circuit for DSL-transmission systems, comprises a replica (8) for emulating the behaviour of the transmission line (17). In addition, a circuit (3... | 12/19/2006 |
| 7149591 | Multi-resolution controller A method for producing a control output is described. The method includes identifying an error signal and decomposing the error signal into a plurality of signal components. The signal components are determined based on a plurality of orthogonal functions representi... | 12/12/2006 |
| 7133425 | Communication system A method and apparatus is disclosed for facilitating high-speed data communication. In one embodiment a receiver is configured to include error correction coding in an interleaved environment to increase data transmission rates. In one embodiment the signal mapping ... | 11/07/2006 |
| 7123651 | Adaptable hybrid and selection method for ADSL modem data rate improvement A method of operating a modem generally comprising the steps of (A) transmitting an invalid signal from the modem at each of a plurality of settings for an echo cancelling hybrid of the modem, (B) calculating a plurality of merit values each in response to an echo s... | 10/17/2006 |
| 7065056 | Transceiver circuit including an echo canceller A circuit for transmitting and receiving communications. The circuit includes a transmit block, a receive block, and an echo canceller, coupled to the transmit block and to the receive block, for determining an echo signal and subtracting it from the received signal... | 06/20/2006 |
| 7061985 | Universal modulator/demodulator A modulation/demodulation device capable of operating with several types of modulation using different carrier frequencies may include a modulator which modulates at least one signal by a signal of a predetermined duration and representative of a binary information ... | 06/13/2006 |
| 7035396 | Configurable echo canceller A configurable adaptive echo canceler which can perform acoustical echo cancellation (AEC) or hybrid echo cancellation (HEC) under software control. Particular parameters based on the particular application can be associated with either a suitable AEC or a suitable ... | 04/25/2006 |
| 7031460 | Telephonic handset employing feed-forward noise cancellation A telephonic handset comprises an active noise reduction (ANR) system. The ANR system comprises a reference microphone and an IIR filter. The IIR filter is receivingly coupled to the reference microphone with respect to noise reference signals, and it is transmittin... | 04/18/2006 |
| 7013226 | Reflectometer with echo canceller Various embodiments are described for an improved reflectometer and/or a modem or other device which may include an improved reflectometer. An apparatus may include a pulse transmitter to transmit a pulse to a line to be tested, a receiver adapted to receive a refle... | 03/14/2006 |
| 7002897 | Multiple channel interference cancellation A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals in a multi-channel environment are manipulated into a transform domain, such as the frequency domain. Thereafter, the signals may ... | 02/21/2006 |
| 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 |
| 6944289 | Delay insertion for echo cancellation, with echo supression, in a communication network The invention provides an apparatus and method for bulk delay insertion prior to echo cancellation, with echo suppression. The exemplary apparatus embodiment (100) bandpass filters (120) and down samples (130), by a down sampling factor, a refer... | 09/13/2005 |
| 6925175 | Long-haul path length delay estimator and compensator for an echo canceller Apparatus and accompanying methods for use in a long-haul echo control device to automatically measure sufficient changes in path length and compensate a long-haul echo canceller for resulting variations in echo occurring over a path. The apparatus measures a round-... | 08/02/2005 |
| 6917252 | Fully integrated automatically-tuned RF and IF active bandpass filters An automatic tuning scheme for two active band-pass filters where both filters operate on the signal while simultaneously being tuned using a reference signal. To allow that the amplitude of a reference signal is made small and since both filters demonstrate a good ... | 07/12/2005 |
| 6744887 | Acoustic echo processing system A system and method of Acoustic Echo Cancellation includes a digital filter used to estimate the echo path is split into 2 filters: one fixed infinite impulse response (IIR) filter and one adaptive finite impulse response (FIR) filter. The fixed filter models the co... | 06/01/2004 |
| 6694020 | Frequency domain stereophonic acoustic echo canceller utilizing non-linear transformations The invention is a multiple channel teleconferencing system employing a stereophonic acoustic echo canceler that exploits the coherence between multiple channels. In accordance with the invention a small non-linearity is incorporated into each channel pat... | 02/17/2004 |
| 6671374 | ADAPTIVE FILTER FOR ECHO CANCELLATION, METHOD FOR OPERATING AN ADAPTIVE FILTER FOR ECHO CANCELLATION, AN ARTICLE OF MANUFACTURE FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER FOR ECHO CANCELLATION AND A COMPUTER IMPLEMENTED CONTROL SYSTEM FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER FOR ECHO CANCELLATION An adaptive filter for echo cancellation includes a segmented sparse transversal filter having an input, the filter having an adjustable length, adjustable lengths for the segments and adjustable tap weights. The adaptive filter further includes an adapti... | 12/30/2003 |
| 6661895 | Zero-delay structure for sub-band echo cancellation A zero-delay structure to be used in sub-band echo cancellation systems. In telecommunications, a delay is usually introduced in sub-band decomposition and/or sub-band reconstruction. This invention will help remove this. This structure not only removes t... | 12/09/2003 |
| 6498850 | Multichannel echo canceller with a compander A compander circuit (20) for echo cancellation in telecommunications apparatus with an estimator module (21) for estimating an echo coupling and a delay of a line echo and a characteristic module (23) with an associated multiplier (24) for controlling the... | 12/24/2002 |
| 6452967 | Method and device for reducing coupling effects between neighboring telephone devices A method for reducing disturbing effects of coupling between a first transmission/reception device and a second transmission/reception device that are each connected to a subscriber line. According to the method, a signal received on a reception path of t... | 09/17/2002 |
| 6426979 | Adaptation control algorithm for echo cancellation using signal-value based analysis The present invention addresses signal noise problems associated with telecommunications. In particular, echo cancellation is addressed by the present invention, which employs an inventive adaptive filtration scheme. In one aspect of the invention, a meth... | 07/30/2002 |
| 6404809 | Method and apparatus for training equalizer structures in a digital communication system having periodic digital impairments An improved two-point equalizer training technique for use with V.90 modem systems utilizes a number of scaling parameters to enable the compensation of robbed bit signaling (RBS) effects in a manner that is decoupled from the compensation of analog impai... | 06/11/2002 |
| 6381272 | Multi-channel adaptive filtering A multi-channel adaptive filter system for use, for example, in echo cancellation for generating an echo estimate for each channel is described. The system includes a forward and backward prediction filter parameter generator that in response to the multi... | 04/30/2002 |
| 6256383 | IIR filter of adaptive balance circuit for long tail echo cancellation An automatic balance system for a transmit signal of a wireless local loop communication system. The automatic balance system includes a finite impulse response (FIR) filter system, the FIR filter system including at least one FIR tap for replicating at l... | 07/03/2001 |
| 6246444 | Digital and analog TV common-use receiver having single ghost canceler and ghost cancellation method A digital/analog TV common-use receiver having a single ghost canceler, and a ghost cancellation method are provided. The single ghost canceler includes a first filter coefficient generator for generating first filter coefficients using a first reference ... | 06/12/2001 |
