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| Number | Title | Issue Date |
| 8009825 | Signal processing The present invention relates to detection of echo in telecommunications networks. The invention provides a method of echo detection comprising the steps of: generating a series of inbound vectors for an inbound signal; generating a series of outbound vectors for an... | 08/30/2011 |
| 7965834 | Method and system for clear signal capture A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.... | 06/21/2011 |
| 7433463 | Echo cancellation and noise reduction method A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.... | 10/07/2008 |
| 7352858 | Multi-channel echo cancellation with round robin regularization A method and system of multi-channel echo cancellation using round robin regularization. The multi-channel round robin regularization echo cancellation method includes applying a plurality of adaptive filters, each having an inverse correlation matrix, to the multi-... | 04/01/2008 |
| 7277538 | Distortion compensation in an acoustic echo canceler An audio communications system has an acoustic echo cancellation (AEC) module. The AEC module receives a digital signal sent to a loudspeaker and a digital signal received from a microphone. The signal received from the microphone contains an echo of the signal play... | 10/02/2007 |
| 7177419 | Methods and apparatuses for detecting and reducing non-linear echo in a multi-carrier communication system Apparatuses, systems, and methods for a multi-carrier communication system that detects and reduces an echo from a non-linear element present on the transmission medium. In an embodiment, a training period is established between a first transmitter-receiver device a... | 02/13/2007 |
| 7123607 | Quality control device for voice packet communications A quality control device which improves the quality of voice packet communication. The quality control device used for voice packet communications for transmitting voice packets through a quality non-asurance type network includes a buffer memory for temporarily sto... | 10/17/2006 |
| 7110532 | Method of line matching in telecommunication networks One aspect of the invention relates to a method for line matching of analog communication lines in telecommunications networks, whereby signal processor(s) and/or programmable digital filters are used. Coefficients of the line transmission function are calculated by... | 09/19/2006 |
| 7103623 | Partitioned block frequency domain adaptive filter The partitioned block frequency domain adaptive filter according to the invention includes a plurality of parallel arranged filter partitions. Each filter partition models a part of an impulse response of the adaptive filter and has update unit for updating filter c... | 09/05/2006 |
| 7099460 | Echo suppression and echo cancellation Echo canceling method including the steps of determining an Euclidean norm of an echo-replica signal, determining an Euclidean norm of an input signal, determining a gradient step size, correcting the coefficients of an adaptive filter, deriving an updated echo-repl... | 08/29/2006 |
| 7054437 | Statistical adaptive-filter controller This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizations of AEC units. The improv... | 05/30/2006 |
| 7020246 | Time domain reflected signal measurement using statistical signal processing An apparatus and technique for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. Time domain reflected (TDR) signals that are echoes of transmit impulse signals are processed using time domain echo averaging and echo... | 03/28/2006 |
| 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 |
| 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 |
| 6914963 | Determining the composition of subscriber loops from frequency domain measurements Techniques for estimating distances to irregularities on a subscriber loop are described. A loop response is measured in the frequency domain. The loop response is weighted by a prolate spheroidal wave function to yield a weighted response. The weighted response is ... | 07/05/2005 |
| 6912281 | Route delay sensitive echo cancellation Long distance telephone connections must commonly employ echo cancellers to eliminate irritating echo. The normal practice is to additionally employ non-linear processors (NLPs) as an integral component of an echo canceller in order to eliminate small residual echo ... | 06/28/2005 |
| 6859531 | Residual echo estimation for echo cancellation Real and imaginary components of the discrete Fourier transform (DFT) of the residual echo in an acoustic echo cancellation system are separately estimated using mapping functions derived without an assumption of statistical independence between separate components ... | 02/22/2005 |
| 6792107 | Double-talk detector suitable for a telephone-enabled PC A double-talk detector (109) for an acoustic echo canceler (104) of a VoIP terminal (101) converts (216,226) received far-end signals (212) and transmitted near-end signals (222) into the frequency domain and high-pass filte... | 09/14/2004 |
| 6766019 | Method and apparatus for performing double-talk detection in acoustic echo cancellation A method and apparatus for performing double-talk detection in an acoustic echo canceller in which a detection statistic is advantageously computed based on an estimate of a cross-correlation between the far-end signal and the return signal which has been normalized... | 07/20/2004 |
| 6757385 | Symmetry based subband acoustic echo cancellation Processing complexity in an acoustic echo canceller can be reduced by partitioning the input near-end and far-end signals into respective pluralities of frequency subband signals. Also, due to the complex conjugate symmetry of conventional Discrete Fourier Transform... | 06/29/2004 |
| 6744884 | Speaker-phone system change and double-talk detection A speaker-phone that is operable to perform system change detection, double-talk detection and if desired, optimal step-size control. The invention differentiates between system change and double-talk and is operable to these two situations differently. The inventio... | 06/01/2004 |
| 6738480 | Method and device for cancelling stereophonic echo with frequency domain filtering The filtering coefficients of a frequency domain stereophonic echo canceller are adapted by a method which takes account of the cross-correlation between the input signals relating to the two channels. In particular, the adaptation process takes account of the coher... | 05/18/2004 |
| 6671252 | Robust signaling tone duration measurement Apparatus and methods for adaptively, reliably, and accurately measuring the duration of an alerting or other signaling tone. A tone detector in accordance with the principles of the present invention accurately measures a duration of a tone burst (i.e., ... | 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 |
| 6580795 | Echo canceller for a full-duplex communication system and method therefor An echo canceller (110) for a full-duplex communication system (100) such as a speakerphone determines a gain factor to be used in sub-band adapter coefficient updates by using both time domain and sub-band signals to determine the state of the system (10... | 06/17/2003 |
| 6577731 | Method and apparatus of cancelling multi-channel echoes The magnitude processing circuit 607 non-linearly processes the received signal 2 and then outputs a non-linear processed signal. The delay processing circuit 300 further delays the non-linear processed signal and then outputs a delayed processed signal. ... | 06/10/2003 |
| 6563925 | Method and apparatus for space-time echo cancellation Echo is canceled in a communication device including at least one microphone and a loudspeaker. Signals directed to the loudspeaker are filtered through at least one first filter. The filtered signals are subtracted from signals received by the microphone... | 05/13/2003 |
| 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 |
| 6493448 | Process for echo suppression with adaptive fir filters A process for suppressing total echoes comprising a plurality of partial echoes in telecommunications (TK) equipment such as terminals, transmission systems, or switching equipment by means of adaptive FIR (=Finite Impulse Response) filters that simulate ... | 12/10/2002 |
| 6456650 | Splitterless modem using harmonics reduction In a splitterless Digital Subscriber Line (DSL) modem 30, a receiver architecture (100) that permits monitoring of harmonics within the upstream channel of a DSL connection. The receiver (100) can detect the harmonics by monitoring the harmonics in some e... | 09/24/2002 |
| 6167133 | Echo detection, tracking, cancellation and noise fill in real time in a communication system A method for processing telecommunications signals to alleviate echo during a voice communication between a local talker and a remote talker comprises the application of circular buffers for near and far end signals to preserve processing time. Overlappin... | 12/26/2000 |
| 6144695 | Method and apparatus for reducing near-end crosstalk (NEXT) in discrete multi-tone modulator/demodulators This invention reduces near-end crosstalk between identical discrete multi-tone (DMT-type) modems by introducing the following modifications to modems at a central office or a subscriber premises. The modifications include: a mechanism for aligning the fr... | 11/07/2000 |
| 6108413 | Echo cancellation method and echo canceller implementing such a process A reception signal is input to an echo generator system. An observation signal is gathered from the system. The reception signal is filtered to produce an echo prediction signal. The echo prediction signal is subtracted from the observation signal to prod... | 08/22/2000 |
| 6052421 | Method for separating a desired signal from an interfering signal A method for separating a desired signal from an interfering signal, which is particularly useful when the desired signal is substantially weaker than the interfering signal, includes the steps of providing a combined signal which contains both a desired ... | 04/18/2000 |
| 5987143 | Method and apparatus for erasing acoustic echo An acoustic echo erasing apparatus which generates a pseudo-echo component from an audio reception signal (a vector x1) using an adaptive filter, and removes the pseudo-echo component from an audio transmission signal (a vector y). The apparatu... | 11/16/1999 |
| 5848151 | Acoustical echo canceller having an adaptive filter with passage into the frequency domain The echo canceller comprises an adaptive filter receiving the coefficients of a direct discrete transform into the frequency domain, computed on successive blocks of an input signal and fed via an inverse transform circuit to the subtractive input of an a... | 12/08/1998 |
| 5768165 | Digital time signal filtering method and device for transmission channel echo correction A method for filtering a time signal (e(t)) sampled in blocks of N samples (e(n),e(k)) uses a transfer function defined in the frequency domain by LN samples (H(K)). The transfer function is filtered by a time window (g1) of width N, and a frequency subsa... | 06/16/1998 |
| 5732134 | Doubletalk detection by means of spectral content A method and apparatus are described for detecting doubletalk in an acoustic echo canceller. The present invention examines the spectral characteristic of the near-end audio signal and the spectral characteristics of the far-end audio signal and determine... | 03/24/1998 |
| 5717768 | Process for reducing the pre-echoes or post-echoes affecting audio recordings For various values of an integer p, short-term discrete Fourier transforms X(p,k) and X͌ (p,k) of the audio signal shifted by pR samples and of the audio signal shifted by pR+͌ samples are respectively calculated, R denoting a predetermined i... | 02/10/1998 |
| 5691893 | Adaptive control system An adaptive control system for reducing undesired signals comprises a processor (36) which provides secondary signals for sources (37) for interference with the undesired signals. Sensors (42) measure the residual Vibration which is indicative of the inte... | 11/25/1997 |
