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| Number | Title | Issue Date |
| 8054966 | Echo cancellation and noise reduction adaptation during ringing signal playback A communication device is provided that includes a speaker for outputting a ringing signal, a microphone for receiving the ringing signal, and logic configured to analyze the spectral content of the received ringing signal and adjust noise reduction parameters and e... | 11/08/2011 |
| 7881460 | Configuration of echo cancellation A determination to enable echo cancellation is made in advance of a real-time communication session. A model sample audio file stored in memory on the computer system is played through a loudspeaker connected with the computer system. The sound generated by the loud... | 02/01/2011 |
| 7636436 | Method for the performance testing of echo cancellers using an artificial segmented test signal A method for the performance testing of an echo canceller including the steps of transmitting a test signal to the echo canceller, recording an echo energy signal output from the echo canceller as a result of the test signal, measuring the energy and duration of the... | 12/22/2009 |
| 7406090 | Managing a buffer for media processing A method and apparatus to perform buffer management for media processing are described. ... | 07/29/2008 |
| 7353002 | Measuring a talking quality of a communication link in a network Device and method for measuring a talking quality of a communication link in a communications network (10). The device comprises measurement means (22; 31, 36) connected to the communication link, which are arranged to subject a degraded speech signal ... | 04/01/2008 |
| RE40054 | Video-assisted audio signal processing system and method A circuit arrangement for controlling audio signal transmissions for a communications system that includes a microphone and a video camera. The arrangement comprises a video processor configured and arranged to receive a video signal from the video camera, detect mo... | 02/12/2008 |
| 7312904 | Apparatus, method and program for communication Facsimile communication is correctly performed even when an echo is generated in a communication line having a delay, by handling an echo signal in such a manner that when an echo of a CFR signal (according to the ITU-T recommendation V.21) transmitted from a receiv... | 12/25/2007 |
| 7310425 | Multi-channel frequency-domain adaptive filter method and apparatus The invention is a method and apparatus for frequency-domain adaptive filtering that has broad applications such as to equalizers, but is particularly suitable for use in acoustic echo cancellation circuits for stereophonic and other multiple channel teleconferencin... | 12/18/2007 |
| 7263184 | Method and apparatus for active reduction of speakerphone singing In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by ... | 08/28/2007 |
| 7249676 | Packaging, storage and display apparatus and system The present invention is directed to a packaging, storage and display system for articles, such as small tools, like drill bits and the like. An index for holding the articles is pivotably mounted in a case. A rack, which may be selected from a variety of rack struc... | 07/31/2007 |
| 7221755 | Method of capturing constant echo path information in a full duplex speakerphone A method of improving convergence of an echo canceller in a full duplex speakerphone, wherein the echo canceller includes LEC (Line Echo Canceller) and AEC (Acoustic Echo Canceller) portions, comprising the steps of capturing coefficients during operation, storing t... | 05/22/2007 |
| 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 |
| 7194037 | Active replica transformer hybrid A communication circuit includes a near end replication transmitter and a hybrid having an input in communication with an output of the near end transmitter. A high pass filter is responsive to the near end replication transmitter. A subtractor subtracts an output o... | 03/20/2007 |
| 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 |
| 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 |
| 7133442 | Rapid identification of transmission media channel characteristics Rapid identification and modeling of transmission media channel characteristics of a communications system using a correlation based technique. The technique provides a known training sequence used to generate a known quantity that operates on an observed or measure... | 11/07/2006 |
| 7068798 | Method and system for suppressing echoes and noises in environments under variable acoustic and highly feedback conditions Method and system for canceling echoes and noises in environments with variable acoustic conditions and high feedback, such as the interior of an automotive vehicle, permitting audible communication between the occupants, comprising one/several microphone/s (1 | 06/27/2006 |
| 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 |
| 7062039 | Methods and apparatus for improving adaptive filter performance by inclusion of inaudible information Adaptive filtering algorithm training signals incorporate adaptation-enhancing signals having properties, such as spectral whiteness and rapidly decaying auto-correlation between samples, which allow the adaptive filtering algorithms to converge more quickly as comp... | 06/13/2006 |
| 7054438 | Method and apparatus for active reduction of speakerphone singing In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by ... | 05/30/2006 |
| 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 |
| 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 |
| 7023812 | System and method for improving modem transmission through private branch exchanges, central offices, and other systems A modem including an echo canceller adapted to determine locations of far-end echo sources. The echo canceller is adapted to send a signal to turn off network echo suppressors and enter a training mode. A training signal at a predetermined modem training frequency i... | 04/04/2006 |
| 7024175 | System for masking microphonic voice signals in wired telecommunications equipment A system to thwart eavesdropping on microphonic audio signals generated by a powered telecommunications device connected to a communications line, comprising a noise generator for applying low level noise to the line, thereby masking microphonic audio signals, and a... | 04/04/2006 |
| 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 |
| 7020068 | Echo and crosstalk cancellation A cancellation system comprises a channel circuit (11) for each noise source, such as echo in a particular cable pair. There are only eighty taps per channel, in two blocks (n_echo_a, f_echo_a). Each block is preceded by a variable delay line comprising block... | 03/28/2006 |
| 7009945 | Dual-mode analog/digital adaptive echo cancellation in communication systems with asymmetric spectrum An echo cancellation (EC) system for use in a full-duplex communication system having asymmetric signal sampling rates, in particular an ADSL system, is described. The system performs the cancellation of local echo signal in digital or analog domain depending on the... | 03/07/2006 |
| 7003100 | Modem with enhanced echo canceler A modem incorporating apparatus and methods to achieve computationally efficient echo cancellation. The apparatus include a cyclic echo synthesizer sub-canceler in the time domain and a echo canceler in the frequency domain. The method includes generating a cyclic e... | 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 |
| 6959277 | Voice feature extraction device In a conventional device for extracting voice features accurately without being influenced by noises, such as a voice recognition device, usually an input voice signal is processed first by a noise reduction system having the tap length N, and the result is FFT-proc... | 10/25/2005 |
| 6950842 | Echo canceller having an adaptive filter with a dynamically adjustable step size The present invention is directed to an echo canceller adapted for use in a communication system that includes a hybrid circuit. The echo canceller comprises an adaptive digital filter that generates an estimated echo signal {circumflex over (z)}[k] in response to: ... | 09/27/2005 |
| 6947553 | Communication system for controlling training of echo canceller and line switching system A communication system being made up of a two-wire/four-wire hybrid circuit, an echo canceller, and a control device and having functions of forming a plurality of communication paths and changing communication paths is provided which is capable of ensuring high spe... | 09/20/2005 |
| 6944220 | Circuit configuration for the offset compensation of a signal For the offset compensation of a digital signal, particularly of a communication signal transmitted in a cordless digital communication system, a recursive digital filter is used. The recursive digital filter has at least one filter coefficient that is varied in a t... | 09/13/2005 |
| 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 |
| 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 |
| 6928160 | Estimating bulk delay in a telephone system A bulk delay estimating circuit matches time intervals representing a signal with time intervals representing an echo of the signal to identify the echo and estimate bulk delay. Bulk delay is estimated by computing (1, 2, . . . n) intervals representing the signal, ... | 08/09/2005 |
| 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 |
| 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 |
| 6889066 | Network echo suppression in mobile stations In one embodiment, a mobile station such as a dual-mode, AMPS and CDMA, handset communicates with an AMPS base station in a wireless communication system. The mobile station includes an acoustic echo canceller, which can detect acoustic echo, for example, feedback f... | 05/03/2005 |
| 6785384 | Two-step algorithm for training an echo cancellation filter A two-step training method for the estimation filter in the echo cancellation (EC) path of the analog front-end (AFE) circuit for a modem, such as an asymmetric digital subscriber line (ADSL) modem. During the first step, the transmit (TX) path is turned off and a d... | 08/31/2004 |
