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| Number | Title | Issue Date |
| 7693276 | Method of measuring distortion and determining residue-echo threshold in loop start trunk circuits A method of determining residue-echo threshold for the trans-hybrid echo path of a loop start (LS) trunk line, comprising the steps of estimating the impulse response of the trans-hybrid echo path, passing a speech-like signal through the LS trunk circuit and collec... | 04/06/2010 |
| 7340265 | Method and apparatus for transient frequency distortion compensation Transient distortion is compensated for by multiplying an exponentially-decaying phase shift onto the distorted waveform. The exponentially decaying phase shift waveform is patterned after the transient which typically takes the form of an exponential and occurs upo... | 03/04/2008 |
| 7315619 | System and method for enhanced subjective stereo audio The present invention relates to an audio communication system and method with improved acoustic characteristics. The present invention utilizes the Haas effect to simulate a sound picture that gives a better subjective impression of stereo sound compared to the obj... | 01/01/2008 |
| 7305083 | Echo canceller An echo canceller used in a vocal information exchange system operates in such a circumstance that a sound wave released by a speaker is picked up by a microphone unintentionally and works to suppress an echo signal included in the audio signal produced by the micro... | 12/04/2007 |
| 7280654 | Modified affine projection algorithm for non-stationary signal An affine projection or like algorithm is used to process a non-stationary signal. The affine projection algorithm creates an inverse matrix and includes a factor γ to avoid numerical instability in the inverse matrix. The factor γ is adaptively adjusted according... | 10/09/2007 |
| 7263134 | Ethernet transceiver with single-state decision feedback equalizer Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components i... | 08/28/2007 |
| 7260163 | Noise blanker using an adaptive all-pole predictor and method therefor A noise blanker (40, 106) monitors and removes noise from a sampled signal by adaptive filtering (98, 150) the sampled signal to generate trained adaptive filter prediction coefficients. The sampled signal is provided as an output signal when the noise... | 08/21/2007 |
| 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 |
| 7218730 | System and method for analysis and filtering of signals in a telecommunications network A system and method for signal analysis in a network. The method includes attempting, by a first processor, to compute optimal coefficients for filtering a signal, determining that computing the optimal coefficients exceeds the computational capabilities of the firs... | 05/15/2007 |
| 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 |
| 7212628 | Echo cancellation/suppression and double-talk detection in communication paths A method of suppressing an echo signal in a communication path such as acoustic coupling between a speaker and a microphone in a telephone device handset includes the steps of monitoring a transmitted signal supplied to the communication path to determine an attribu... | 05/01/2007 |
| 7205883 | Tamper detection and secure power failure recovery circuit A security system including a token and a host system. The token includes volatile random access memory for storing security data for use during a step of secure authentication, an interface for providing communication with a host system when coupled thereto, and a ... | 04/17/2007 |
| 7200221 | Methods and systems for providing multi-path echo cancellation Providing multi-path echo cancellation comprises providing a main echo signal corresponding to a main echo section of an echo response and providing a plurality of tail echo signals, each of the plurality of tail echo signals corresponding to respective tail echo se... | 04/03/2007 |
| 7181001 | Apparatus and method for echo cancellation An apparatus and method for echo cancellation that detects and tracks the active regions of the echo channel impulse response rather than the entire echo channel impulse response and uses this sparse model to cancel the echo component of the received signal. Two set... | 02/20/2007 |
| 7154867 | 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... | 12/26/2006 |
| 7136471 | Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path A method and apparatus for detecting whether a remote party has added a secondary telephone destination to a telephone call, for example through the activation of three-way calling service, conference calling or two lining bridging, by identifying an echo characteri... | 11/14/2006 |
| 7133478 | Device and method for detecting and suppressing noise A device for detecting and suppressing noise includes a noise detection device that receives and processes an input signal to determine if the input signal contains noise and provides a detected noise signal indicative of whether or not noise is detected in the inpu... | 11/07/2006 |
| 7095846 | Half duplex device and signal processing method thereof A half duplex device and signal processing method thereof. First, a signal detection unit of a signal detector of a half duplex device obtains a short-term power and long-term power. Next, a data update unit of the signal detector sets a short-term power threshold a... | 08/22/2006 |
| 7085374 | Distributed echo cancelling A distributed echo cancelling architecture is provided where echo-cancelling functions are performed at locations remote from devices receiving signals with echoes. The echo cancelling functions use a reference signal, which has been corrupted with the echoes at the... | 08/01/2006 |
| 7085370 | Ringback detection circuit A ringback detector determines whether ringback by comparing measurements of a characteristic of the received signal, such as the energy of the received signal, to a threshold. The threshold is set initially to a low value and then updated based on the measurements ... | 08/01/2006 |
| 7065207 | Controlling attenuation during echo suppression An echo canceling system receives and transmits audio signals between a far end and a near end. During single talk, which is when only one end is originating audio, the path back to the originator is impeded by echo cancellation and attenuation. When there is double... | 06/20/2006 |
| 7062040 | Suppression of echo signals and the like In a microphone signal, the signal component corresponding to, e.g., echo is suppressed using an echo control scheme that estimates the spectral envelope of the echo signal, without having to estimate the waveform for the echo signal. In one embodiment, the input si... | 06/13/2006 |
| 7062038 | System and method of using two coefficient banks in an adaptive echo canceller A device has a first echo canceller having a first bank of coefficients to be applied to a reference signal to produce a first echo prediction signal, and a first arithmetic unit to combine the first echo prediction signal with the echo-bearing signal to produce a f... | 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 |
| 7031459 | Echo canceller employing dual-H architecture having improved non-linear echo path detection An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive non-linear echo path response detection. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an echo response ... | 04/18/2006 |
| 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 |
| 7020099 | Apparatus for, and method of, reducing noise in a communications system A communication line having a plurality of twisted wire pairs connects a plurality of transmitters, one transmitter at each end of each twisted wire pair, with a plurality of receivers, one receiver at each end of each twisted wire pair. Each receiver receives a com... | 03/28/2006 |
| 7016487 | Digital echo cancellation device A digital echo cancellation device is provided. The digital echo cancellation device used for a high speed bidirectional communication system includes an adaptive beamformer in the form of a plurality of finite impulse response (FIR) filters for estimating an input ... | 03/21/2006 |
| 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 |
| 6996231 | Step size convergence control A method of converging a step size control for an adaptive filter of a communication channel including: (1) initializing a nominal step size value and a penalty point value; (2) combining the nominal step size value and the penalty point value to generate a step siz... | 02/07/2006 |
| 6996229 | Echo cancellation filter An echo canceler includes an adaptable filter that is updated during double-talk and far-end talk. The echo canceler receives a microphone signal that includes a near-end signal and echoes resulting from a far-end signal. The echo canceler whitens the far-end signal... | 02/07/2006 |
| 6980646 | Apparatus and method for echo cancellation An apparatus and method for echo cancellation that detects and tracks the active regions of the echo channel impulse response rather than the entire echo channel impulse response and uses this sparse model to cancel the echo component of the received signal. Two set... | 12/27/2005 |
| 6950513 | Impulse response setting method for the 2-channel echo canceling filter, a two-channel echo canceller, and a two-way 2-channel voice transmission device Two signals, which are mutually correlated, are subjected to a principal component analysis and converted into two signals being put in an orthogonal relation, thereby generating two signals being non-correlated. Those two signals are reproduced by speakers, and the... | 09/27/2005 |
| 6944288 | Double-talk and path change detection using a matrix of correlation coefficients A process is described which generates matrix coefficients using zero-lag auto and cross-correlations from signals commonly found in echo cancellers. Double-talk and path changes are then detected using matrix operations such as determinants, eigendecompositions, or... | 09/13/2005 |
| 6937722 | Method and apparatus for echo cancellation An echo canceler for generating an echo replica and subtracting the echo replica from a local input signal to create a residual signal for outgoing transmission. An echo canceler has adaptive filters that have different computational accuracy generating the echo rep... | 08/30/2005 |
| 6934386 | Echo canceller An echo canceller used in a vocal information exchange system operates in such a circumstance that a sound wave released by a speaker is picked up by a microphone unintentionally and works to suppress an echo signal included in the audio signal produced by the micro... | 08/23/2005 |
| 6934387 | Method and apparatus for digital near-end echo/near-end crosstalk cancellation with adaptive correlation A communication transmitting and receiving system in which the effects of near-end echo and near-end crosstalk signal from the communication medium are mitigated by adaptively reproducing the near-end echo and near-end crosstalk signal, which is then subtracted from... | 08/23/2005 |
| 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 |
| 6912323 | Method and apparatus for fast signal convolution using separated-spline kernel A fast convolution method applicable to convolving a signal (indicative of an n-dimensional pattern, where n is greater than or equal to two) with a smooth kernel that can be approximated by a separated-spline kernel, and a system configured to perform such method u... | 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 |
