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| Number | Title | Issue Date |
| 8139760 | Estimating delay of an echo path in a communication system Methods and corresponding systems for reducing an echo signal include assigning a subsegment delay to each of a plurality of subsegment adaptive filters. A send signal and a delayed receive signal are coupled to each of the subsegment adaptive filters, wherein the d... | 03/20/2012 |
| 8023641 | Spectral domain, non-linear echo cancellation method in a hands-free device Disclosed is a non-linear echo canceller and method for cancelling echo during full duplex communication in a hands free communication system. An input signal from a far-end talker and an input signal from the output from an echo canceller are received. K spectral s... | 09/20/2011 |
| 7869587 | Method and apparatus for canceling acoustic echo in a mobile terminal An acoustic echo canceller (AEC) apparatus for canceling an echo signal input to a microphone in a mobile terminal. In the AEC apparatus, a first analysis filter bank divides a signal received from the microphone into a plurality of subband signals, and classifies t... | 01/11/2011 |
| 7822194 | Method and system for low delay echo cancelling The present invention relates to an audio communication system and method with improved acoustic characteristics. It combines the benefits from full band echo cancellers and sub-band echo cancellers, by merging the filter taps of sub-band filters into the respective... | 10/26/2010 |
| 7813499 | System and process for regression-based residual acoustic echo suppression A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not suppressed by an acoustic echo canceller (AEC). In general, a prescribed reg... | 10/12/2010 |
| 7515704 | Method, apparatus and articles incorporating a step size control technique for echo signal cancellation A novel technique for canceling echo signal in teleconferencing applications. In one example embodiment, a low complexity double-talk and noise robust frequency domain adaptive filter is used to cancel the echo signal during the teleconferencing applications. The ad... | 04/07/2009 |
| 7502461 | Echo cancellation in a communication network A method of canceling an echo in a signal of a communication network may include filtering an input signal and a corresponding reference signal of an echo path so as to produce vectors of N subband signals corresponding to the input signal and N subband reference ec... | 03/10/2009 |
| 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 |
| 7346014 | System and method for echo cancellation An apparatus and method for canceling an echo signal is disclosed. The apparatus includes an echo filter, an up-sampler, an interpolation filter, and a signal combining apparatus. The echo filter filters the transmitted signal, the up-sampler up-samples the output o... | 03/18/2008 |
| 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 |
| 7304597 | Adaptive interpolation for use in reducing signal spurs A method and apparatus for acquiring an analog signal. The method of the invention comprising the steps of acquiring a first portion of the analog signal by a first channel, the first portion of the analog signal spanning a first bandwidth range, and acquiring a sec... | 12/04/2007 |
| 7293055 | Flexible adaptation engine for adaptive transversal filters A flexible adaptation engine includes a coefficient adaptation circuit that implements multiple adaptation algorithms, and/or multiple coefficient selection algorithms, to adapt the filter coefficients of one or more digital filters, such as the transversal filters ... | 11/06/2007 |
| 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 |
| 7272224 | Echo cancellation A method, apparatus, system, and signal-bearing medium that in an embodiment determine a degree of correlation between a speaker output signal and a microphone input signal and modulate an adaptive gain of an acoustic echo canceller based on the degree of correlatio... | 09/18/2007 |
| 7269550 | Encoding device and decoding device An encoding device (200) includes: a time characteristic extracting unit (203) that specifies a band for a part of a frequency spectrum based on a characteristic of an audio input signal in a time domain; a time transforming unit (204) that tran... | 09/11/2007 |
| 7251322 | Systems and methods for echo cancellation with arbitrary playback sampling rates The present invention relates to systems and methods that remove echo from a signal via a novel echo cancellation technique that supports arbitrary playback sampling rates. The novel echo cancellation technique transforms a playback signal to a frequency domain repr... | 07/31/2007 |
| 7242763 | Systems and methods for far-end noise reduction and near-end noise compensation in a mixed time-frequency domain compander to improve signal quality in communications systems Methods and systems for a mixed time-frequency domain compander, where the expander and compressor are applied in the frequency domain (subbands), while the limiter and the linear gain are applied in the time-domain (full band). Far-end noise reduction is achieved b... | 07/10/2007 |
| 7197146 | Microphone array signal enhancement A system and method facilitating signal enhancement utilizing an adaptive filter is provided. The invention includes an adaptive filter that filters an input based upon a plurality of adaptive coefficients and modifies the adaptive coefficients based on a feedback o... | 03/27/2007 |
| 7190800 | Howling control device and howling control method A howling control apparatus and howling control method for controlling time up to the cancellation of howling suppression according to a howling occurrence situation, thereby eliminating the repetition of howling suppression and cancellation. A howling detecting sec... | 03/13/2007 |
| 7167568 | Microphone array signal enhancement A system and method facilitating signal enhancement utilizing an adaptive filter is provided. The invention includes an adaptive filter that filters an input based upon a plurality of adaptive coefficients and modifies the adaptive coefficients based on a feedback o... | 01/23/2007 |
| 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 |
| 7123704 | 3-Way call detection system Disclosed herein is a three-way call detection system and method for detecting the addition of a third party to a pre-existing telephonic connection between a first party and a second party. The system comprises: a meter for measuring the amplitude of a line voltage... | 10/17/2006 |
| 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 |
| 7103177 | Reduced complexity transform-domain adaptive filter using selective partial updates A transform-domain adaptive filter uses selective partial updating of adaptive filter parameters. This updating may be based on a constrained minimization problem. The adaptive filter parameters are separated into subsets, and a subset is selected to be updated at e... | 09/05/2006 |
| 7099380 | Apparatus for antenna diversity for wireless communication and method thereof A method and an apparatus for selecting an antenna from an antenna diversity array in a wireless communication system are provided. The method includes the steps of modulating an incoming signal with a spread-spectrum type modulation, measuring a signal quality valu... | 08/29/2006 |
| 7068780 | Hybrid echo canceller Systems and methods for reducing transmit echo in a transceiver are disclosed. A hybrid echo canceller includes a limited tap length FIR filter to cancel short-term echo, while an interpolated filter is used to cancel the long-tail echo. The limited tap length FIR f... | 06/27/2006 |
| 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 |
| 7062041 | Device and method for carrying out multichannel acoustic echo cancellation with a variable number of channels A multichannel full-duplex audio signal transmission system, comprising an adaptive filter (2) provided for multichannel acoustic echo cancellation. A channel combining device (5) is provided between the preprocessing units (V1, . . . VD) and lo... | 06/13/2006 |
| 7043014 | Apparatus and method for time-alignment of two signals A recently received portion of a transmit signal is utilized, and a pitch period of the received signal is determined. Then, the determined pitch period is utilized to search for similarities in the originally transmitted signal. This searching is done over a range ... | 05/09/2006 |
| 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 |
| 7027593 | Apparatus and method for echo control Determining the time delay between a transmitted signal and an echo. Then, the echo canceller is adjusted by the delay amount so that the echo canceller tail length is relatively short. ... | 04/11/2006 |
| 7003101 | Subband echo location and double-talk detection in communication systems A method of controlling an echo canceller in a communications channel, is disclosed wherein input signals from the communications channel are first subbanded into a subband. Echo locations are then identified within the subband and are used to control the echo cance... | 02/21/2006 |
| 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 |
| 6993477 | Methods and apparatus for adaptive signal processing involving a Karhunen-Loève basis A signal processing device utilizes a stochastic approximation of a gradient descent algorithm for updating a transform. The signal processing device is configured to implement the transform for producing a desired transformed output signal, and the transform is upd... | 01/31/2006 |
| 6968064 | Adaptive thresholds in acoustic echo canceller for use during double talk Disclosed is an apparatus for cancelling far endpoint echo signals in audio signals transmitted from a near endpoint to a far endpoint. In one embodiment, the apparatus includes a near endpoint analysis filter bank operable to divide a near endpoint signal into a pl... | 11/22/2005 |
| 6961395 | Time variant filter implementation The present invention relates to the efficient realization of a time variant multi-rate FIR filter cascaded with a time invariant FIR filter. Preferably, the time invariant FIR filter response provides filtering based on channel estimates and the time variant FIR fi... | 11/01/2005 |
| 6952473 | System and method for echo assessment in a communication network A method includes receiving a plurality of packets from at least two voice packet streams. The method also includes generating at least two voice signals using the plurality of packets. Each voice signal is associated with one of the voice packet streams. In additio... | 10/04/2005 |
| 6912209 | Voice gateway with echo cancellation A network gateway is configured to facilitate on line and off line bi-directional communication between a number of near end data and telephony devices with far end data termination devices via a hybrid fiber coaxial network and a cable modem termination system. The... | 06/28/2005 |
| 6895086 | 3-Way call detection system and method Disclosed herein is a three-way call detection system and method for detecting the addition of a third party to a pre-existing telephonic connection between a first party and a second party. The system comprises a meter for measuring the amplitude of a line voltage ... | 05/17/2005 |
| 6873704 | Apparatus for removing echo from speech signals with variable rate An echo canceler for canceling echo components having a plurality of cascade-connected adaptive filters and a plurality of update control means. The echo canceler may further include an update control selective circuit for generating selective signals which enable o... | 03/29/2005 |
