Matches 1 - 50 out of 99 1 2 >
Match Document Document Title
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...
7620172 Method and system for eliminating noises and echo in voice signals  
Techniques for simultaneously and efficiently eliminating echo and noise mixed in voice are disclosed. According to one aspect of the present invention, an adaptive filter system for eliminating...
7599483 Echo canceler circuit and method  
An echo canceler circuit ( 10 ) and method attenuates at least post-echo canceler uplink data ( 90 ) to produce attenuated uplink data ( 100 ) in response to uplink echo return loss based...
7516033 Method and apparatus for identifying echo sources in a communication path  
A method and apparatus for identifying echo sources in a communication path. A system that incorporates teachings of the present disclosure may include, for example, an echo measurement device...
7480377 Dual adaptive filter apparatus and method  
A method and apparatus for adapting dual filters is disclosed. In one aspect, a method may include transforming a signal, adapting a first adaptive filter based on the transformed signal,...
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...
7403608 Echo processing devices for single-channel or multichannel communication systems  
An echo processing technique for attenuating echo components of a direct signal X 1 n in a return signal Y 2 n . A receive gain Gr n and a send gain Ge n are calculated. The receive gain Gr n ...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
7035398 Echo cancellation processing system  
A wraparound delay amount detecting part calculates a cross-correlation r(k) from an output speech signal “a i ” supplied to a loudspeaker and an input speech sigal “b i ” inputted through...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
6947773 Method and apparatus for reducing echo feedback in a communication system  
A method and apparatus for reducing echo feedback in a wireless communication system ( 10 ) is accomplished when a receiving communication unit ( 24 ) senses a feedback signal, or echo, via an...
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...
6947549 Echo canceller  
An echo canceller includes two parallel filters and a controller. The controller chooses the best of the two filters for the final echo cancellation. The filter coefficients are exchanged between...
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...
6944290 Echo cancellation through auxiliary-vector filtering  
A digit signal processing system may include a near end and a far end connected by a pair of signal transmission paths. A signal processing may be located at the near end through which signal...
6940971 Method and system for activating echo suppression in a communications network  
A method for allocating echo canceling devices in a telecommunications network having at least two networks connected to one another by network switching nodes. The network switching nodes have...
6940972 Controlling echo cancellation  
Controlling echo cancellation includes receiving signals associated with a call. A signal of the signals is detected. Whether the detected signal is a high speed signal or a low speed signal is...
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...
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...
6934385 Apparatus of a digital echo canceller and method therefor  
An apparatus of a digital echo canceller comprises a first-set delay circuits, a selector, a second-set delay circuits, a plurality of multipliers and an adder. The first-set delay circuits are...
6931101 Method and apparatus for inband testing of an echo canceller  
Provided is a method and apparatus for inband testing of an echo canceller. The apparatus includes a signal generator for generating an excitation signal including a preamble portion and a test...
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...
6925174 Interaction between echo canceller and packet voice processing  
System and method for processing communication signals in a communication system having a detector for detecting a parameter of a communication signal. A communication signal is provided to a...
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...
6865270 Echo cancellation method and apparatus  
An echo cancellation invention which does away with the need for an accurate double-talk detector, while maintaining a higher adaptation gain for quicker convergence and also providing increased...
6839427 Method and apparatus for echo canceller automatic gain control  
A method and apparatus that performs specific automatic gain control in an echo canceller ( 16 ). The disclosed method and apparatus utilize a low complexity algorithm that performs automatic gain...
6836544 Sidestone reduction in full duplex transceivers  
A method and apparatus enables echo reduction in a full duplex transceiver system. A replica current is subtracted from a receiver via a first differential circuit path that adaptively matches a...
Matches 1 - 50 out of 99 1 2 >