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| Number | Title | Issue Date |
| 8077857 | Portable speakerphone device with selective mixing Disclosed herein are portable teleconferencing products that implement a doubletalk detector in a low frequency range or in a frequency range commensurate with the frequencies through which sound may be efficiently transferred between a speaker and a microphone thro... | 12/13/2011 |
| 7970123 | Adaptive coupling equalization in beamforming-based communication systems A method and system for rapid adaptive coupling equalization in beamforming-based communication systems, particularly sector-based beamforming systems, provides smooth transitions for AEC when the look direction of the communication system changes and when the acous... | 06/28/2011 |
| 7813496 | Method for reducing a computational complexity in non-linear filter arrangements as well as corresponding filter arrangements A method for creating a form of a non-linear filter suitable for reducing a computational complexity is proposed. The filter is resolved into polyphase components in such a way that the polyphase components can be interchanged with a conversion of the sampling rate ... | 10/12/2010 |
| 7724891 | Method to reduce acoustic coupling in audio conferencing systems A method to reduce acoustic coupling in an audio conferencing system having a loudspeaker and a plurality of microphones, comprising detecting the presence of one of either a source of near-end signal or a source of far-end signal source relative to the audio confer... | 05/25/2010 |
| 7627111 | Noise matching for echo cancellers An embodiment of the present invention includes an adaptive predictor, a system white noise generator, and a background noise estimator. The adaptive predictor estimates adaptive weights of autoregressive (AR) model of background noise as background samples in an ec... | 12/01/2009 |
| 7428304 | Method and apparatus for detecting subscriber alerting signal tones and customer premises equipment alerting signal tones to non-echo canceling modems A non-echo canceling voice band modem capable of detecting subscriber alerting signal (SAS) tones and customer premises equipment alerting signal (CAS) tones is provided. The modem includes a shaping filter, an analog-to-digital converter (ADC), a SAS tone detector,... | 09/23/2008 |
| 7403608 | Echo processing devices for single-channel or multichannel communication systems An echo processing technique for attenuating echo components of a direct signal X1n in a return signal Y2n. A receive gain Grn and a send gain Gen are calculated. The receive gain Grn is applied to the direct signal a... | 07/22/2008 |
| 7394898 | Echo removing apparatus An echo removing apparatus for reducing the echo caused by sound returning from a speaker to a microphone of a small-sized communication terminal, such as a portable telephone. The echo removing apparatus includes a filter unit for outputting a pseudo echo signal es... | 07/01/2008 |
| 7359504 | Method and apparatus for reducing echo and noise The present invention provides a solution to the needs described above through a method and apparatus for reducing echo and noise. The apparatus includes a microphone array for receiving and audio signal, the audio signal including a voice signal component and a noi... | 04/15/2008 |
| 7324467 | Bridge circuit to suppress echoes in communication devices Bridge circuit for echo suppression for a reception signal of a communication device connected to a transmission line, to which can be supplied a reception signal received via the transmission line and a transmission signal to be transmitted by the communication dev... | 01/29/2008 |
| 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 |
| 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 |
| 7187765 | Method of capturing constant echo path information in a full duplex speakerphone using default coefficients A method of determining when to save default coefficients in an echo canceller so as to ensure that the capture of coefficients that correspond to the best possible echo cancellation in a current condition. Coefficients are saved at varying times depending on the am... | 03/06/2007 |
| 7149305 | Combined sidetone and hybrid balance A combined sidetone and hybrid balance apparatus and method of operating same are disclosed. An embodiment of the present invention may provide both a hybrid balance mode of operation and a sidetone generation mode of operation within a single integrated circuit dev... | 12/12/2006 |
| 7146003 | Noise level calculator for echo canceller A noise level calculator for detecting noise in a telephone line echo canceller that utilizes adaptive filters enables silencing of noise switching so that it is not heard on the far end side. The calculator promotes determining whether the reference signal applied ... | 12/05/2006 |
| 7106856 | Method and apparatus for performing echo cancellation within a communication network A switching center for use in a communication network includes a pool of echo cancellation units for use in providing echo cancellation services to users associated with the switching center on an “as needed” basis. A communication connection being supported by ... | 09/12/2006 |
| 7088828 | Methods and apparatus for providing privacy for a user of an audio electronic device The invention is directed to techniques for suppressing the voice of a user of an audio electronic device, such as a mobile phone, from being heard by an unintended listener. In one arrangement, the invention includes an input microphone, an electronics module, and ... | 08/08/2006 |
| 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 |
| 7075921 | Remote media control for voice over internet telephony and related applications A person receiving a Voice over IP call, such as a call center agent, remotely controls media settings on a caller's multimedia terminal device functioning as a telephone terminal device. In some embodiments, the call center agent may remotely control media settings... | 07/11/2006 |
| 7068779 | Control of echo cancellers in a telecommunication system The invention relates to a communications network, including switching centers having no echo canceling equipment and switching centers having echo canceling equipment. The switching centers are capable of changing the call party or the call during the call. The swi... | 06/27/2006 |
| 7050545 | Methods and apparatus for echo cancellation using an adaptive lattice based non-linear processor A non-linear processor for managing a speech signal is disclosed. The non-linear processor includes an adaptive lattice filter that generates a prediction error from a residual echo of the speech signal, a signum non-linearity unit that generates an excitation compo... | 05/23/2006 |
| 7042986 | DSP-enabled amplified telephone with digital audio processing A DSP-enabled system and method for increasing intelligibility of audio on amplified telephones by providing digital audio processing customizable based on characteristics of hearing loss specific to individual end users are disclosed. The DSP-enabled amplified tele... | 05/09/2006 |
| 7039181 | Consolidated voice activity detection and noise estimation Methods and apparatus compensating for background noise associated with a transmitted signal. In a first embodiment, an adder combines an echo estimate with the the transmitted signal to form a processed signal, a noise reduction circuit uses a background noise esti... | 05/02/2006 |
| 7035397 | System and method for updating filter coefficients and echo canceller including same A system for updating filter coefficients for use with an echo canceller, a related method for updating filter coefficients and an echo canceller including the system or the method. In one embodiment, the echo canceller has a nonadaptive filter and an adaptive filte... | 04/25/2006 |
| 7035398 | Echo cancellation processing system A wraparound delay amount detecting part calculates a cross-correlation r(k) from an output speech signal “ai” supplied to a loudspeaker and an input speech sigal “bi” inputted through a microphone array to obtain a delay amount “d”... | 04/25/2006 |
| 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 |
| 7003097 | Synchronization of echo cancellers in a voice processing system Methods and apparatus for processing a received voice signal from a variable-delay network by a communications system that has at least one echo canceller. An echo canceller determines delay characteristics that are associated with the received voice signal and corr... | 02/21/2006 |
| 7003095 | Acoustic echo canceler and handsfree telephone set The present invention provides an acoustic echo canceler for use in a telephone set having a handsfree conversation function. This acoustic echo canceler simultaneously achieves both the stabilization and speedup of an estimation operation and also attains the more ... | 02/21/2006 |
| 7003098 | Method and system for measurement of the delay through a network link bounded by an echo canceller A method and system for measuring the signal transmission time through a network link bounded by at least one echo canceller. The method generally includes the steps of determining a signal transmission time (tA) along a network path including the network link bound... | 02/21/2006 |
| 6999582 | Echo cancelling/suppression for handsets A method for suppressing echo signals generated in a communication path such as acoustic coupling between a speaker and a microphone in a telephone device handset includes the steps of monitoring signals supplied to the communication path to determine an attribute t... | 02/14/2006 |
| 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 |
| 6983047 | Echo canceling system for a bit pump and method of operating the same An echo canceling system, method of attenuating echo, and a bit pump and transceiver employing the system and method. The echo canceling system is couplable between a transmit and receive path of the bit pump and receives and attenuates the echo in a receive signal ... | 01/03/2006 |
| 6975722 | Dual echo canceller with fast reflector identification An echo canceller, which includes, receives and sends paths connected to standard telecommunication interfaces, a non adaptive filter with filter reflection coefficients which generate an estimated echo signal, which when subtracted from the send path input produces... | 12/13/2005 |
| 6970559 | Method and apparatus for detecting echo cancellers A method is provided for detecting echo cancellation in a communication network. The method includes the steps of transmitting from an originating unit a pre-defined echo cancellation detection signal to a receiving unit. The resulting signal is detected by the rece... | 11/29/2005 |
| 6961423 | Method and apparatus for performing adaptive filtering 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 ... | 11/01/2005 |
| 6954530 | Echo cancellation filter An echo canceler includes an recursive least squares lattice to whiten a far-end signal s1(t) and provide whitened time delays. The echo canceler further decorrelates a microphone signal based on the whitened time delays to reduce echoes of the far-end si... | 10/11/2005 |
| 6952474 | Phone privacy and unobtrusiveness via voice cancellation A method and apparatus for transmitting a clear voice signal while effectuating speech privacy and unobtrusiveness through adaptive signal processing; includes a voice input microphone, an electrical line for transmitting representations of the received voice signal... | 10/04/2005 |
| 6952472 | Dynamically estimating echo return loss in a communication link A method of estimating an echo return loss of a communication link measures the peak power value of a signal received from a far end of a communication link and the corresponding peak power value of a signal received from the near end of the communication link. When... | 10/04/2005 |
| 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 |
| 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 |
