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9036815 Method for acoustic echo cancellation and system thereof  
The spirit of the present invention is to vary the step size parameter in accordance with the error signal and the output acoustic signal, wherein the filter is easy to implement, nonparametric...
9025763 Apparatus and method for cancelling wideband acoustic echo  
Disclosed is an apparatus and method for cancelling a wideband acoustic echo that controls a data flow of data that is transmitted and received using a central processing unit, and calculates data...
9020171 Method for control of adaptation of feedback suppression in a hearing aid, and a hearing aid  
A method for controlling adaptation of a feedback suppression filter in a hearing aid comprises the step of suspending the adaptation of the feedback suppression filter when the level of a hearing...
9001994 Non-uniform adaptive echo cancellation  
An audio-based system may perform echo cancellation by decomposing an input audio signal and a corresponding reference signal into sub-signals corresponding to different frequency bands and...
8989251 Method and apparatus to compensate for nonlinear echo in an output of a current source  
A compensator generating a compensation signal to compensate for nonlinear echo in an output of a current source. The nonlinear echo is a result of transitioning the current source between an ON...
8983057 Step size control for acoustic echo cancellation  
A step size controller may be used to control the rate of adaptation in an acoustic echo canceller. Step size control based on the values of adaptive coefficients (rather than, e.g., a fixed...
8983058 Echo canceller and a method thereof  
The present invention relates to an echo canceller (300) for estimating a model of an echo signal and a method thereof. The echo canceller comprises at least an adaptive main filter (301) for...
8977545 System and method for multi-channel noise suppression  
Described herein are multi-channel noise suppression systems and methods that are configured to detect and suppress wind and background noise using at least two spatially separated microphones: at...
8965757 System and method for multi-channel noise suppression based on closed-form solutions and estimation of time-varying complex statistics  
Multi-channel noise suppression systems and methods are described that omit the traditional delay-and-sum fixed beamformer in devices that include a primary speech microphone and at least one...
8953776 Particular signal cancel method, particular signal cancel device, adaptive filter coefficient update method, adaptive filter coefficient update device, and computer program  
By using the adaptive filter, the reference input signal is processed so as to identify a pseudo-signal of a particular signal to be deleted. The pseudo-signal is subtracted from the mixture...
8953777 Echo path change detector with robustness to double talk  
An echo path change detector may be used to control the rate of adaptation in an acoustic echo canceller. When echo path change is declared, the rate of adaptation may be increased. However, echo...
8938066 Methods, apparatus and articles of manufacture to cancel echo for communication paths having long bulk delays  
Example methods, apparatus and articles of manufacture to cancel echo for a communication path having long bulk delays are disclosed. A disclosed example method includes determining a first...
8934621 Echo prevention circuit having signal subtracter feature  
An echo prevention circuit comprises an input terminal to which a first input signal is input; a first FIR filter into which the first input signal is input through the input terminal; a second...
8934620 Acoustic echo cancellation for high noise and excessive double talk  
Methods and devices for improved echo cancellation in high noise environments, such as in-car speakerphones and the like, are provided that improve cancellation convergence in a high noise...
8923508 Half-duplex speakerphone echo canceler  
A speakerphone having transmit path with a microphone and a first amplifier having a gain determined by a controller and an input coupled to the microphone, a receive path with a second amplifier...
8923509 Controlling echo in a wideband voice conference  
In one embodiment, an echo canceller configured to cancel echo in a wideband voice conference is provided. A double-talk condition may be when a plurality of users are speaking substantially...
8913737 Echo canceller and microphone apparatus  
An echo canceller for executing adaptive processing for canceling an echo component mixed with an audio input signal includes a volume ratio learner configured to compute a volume ratio between an...
8879720 Acoustic echo cancellation using a variable length adaptive filter  
An audio conferencing system having a base station, a loud speaker and one or more microphones generally operates to receive a F.E. audio signal, play the signal, and to receive a N.E. audio...
8873742 Echo canceller auditor  
Systems and methods are discussed for providing a solution for managing a number of echo cancellers and maintaining their configuration. A software tool is provided to verify and remove incorrect...
8873764 Acoustic echo suppression unit and conferencing front-end  
An acoustic echo suppression unit according to an embodiment of the present invention includes and input interface for extracting a downmix signal from an input signal, the input signal including...
8873765 Noise reduction communication device  
To provide a noise reduction transmitter which can secure clarity of sounds collected in very noisy environments and maintain a quality of sounds without devising a noise insulation cover...
8855329 Quiet fan incorporating active noise control (ANC)  
An active noise control (ANC) system may be implemented to both sides of a fan, such that both directions of the noise emitting are treated to reduce the overall noise. The impact on airflow is...
8831210 Method and system for detection of onset of near-end signal in an echo cancellation system  
A method, a system and a computer program product for fast detection of the onset of a near-end signal is provided. An Acoustic Echo Canceller (AEC) attenuates an acoustic echo present in a...
8817970 Fast echo gain change detection  
An apparatus generally having a first circuit and a second circuit is disclosed. The first circuit may be configured to synthesize a first vector by filtering a second vector based on a third...
8804979 Method of determining parameters in an adaptive audio processing algorithm and an audio processing system  
A method and an audio processing system determine a system parameter, e.g. step size, in an adaptive algorithm, e.g. an adaptive feedback cancellation algorithm so as to provide an alternative...
8804946 Stochastic vector based network echo cancellation  
An apparatus generally having a first circuit and a second circuit is disclosed. The first circuit may be configured to generate a first sample by filtering an input vector based on (a) a filter...
8792649 Echo canceller used for voice communication  
An adaptive filter unit outputs a send-mid signal obtained by eliminating echo from a send-in signal, and a power comparing unit calculates a power ratio between received signal power and send-mid...
8787560 Method for determining a set of filter coefficients for an acoustic echo compensator  
The invention provides a method for determining a set of filter coefficients for an acoustic echo compensator in a beamformer arrangement. The acoustic echo compensator compensates for echoes...
8787561 Techniques for implementing adaptation control of an echo canceller to facilitate detection of in-band signals  
A technique for detecting in-band signaling tones in a communication system includes performing a first adaptation of an adaptive filter of an echo canceller in response to detection of a far-end...
8774399 System for reducing speakerphone echo  
A telecommunication system including a speakerphone provides a coupled signal path, including a microphone, configured to sense an incoming audio signal and an echo signal and generate a coupled...
8774262 Adaptive equalization with group delay  
Methods, apparatuses, and systems are presented for performing adaptive equalization involving receiving a signal originating from a channel associated with inter-symbol interference, filtering...
8761386 Sound processing apparatus, method, and program  
A sound processing apparatus includes: a sound output unit which outputs sound based on a first sound signal as first sound processing when execution of the first sound processing is instructed; a...
8750493 Method and system for stereo echo cancellation for VoIP communication systems  
An exemplary embodiment of the present invention is directed toward a method and system for cancelling line echo in the presence of a known secondary audio signal. Filter adaptation is enabled in...
8743939 Nonlinear echo compensator for class B transmitter line driver  
A nonlinear echo compensator comprises a mapping circuit that includes a weighting circuit that generates a weighted signal based on a current symbol and a prior symbol and a function generating...
8737601 Echo canceller  
The proposed echo canceller comprises:—an adaptive filter for receiving a signal affected by an echo, and for supplying a filtered signal that is an estimate of the echo;—a subtractor for...
8731207 Apparatus and method for computing control information for an echo suppression filter and apparatus and method for computing a delay value  
An embodiment of an apparatus for computing control information for a suppression filter for filtering a second audio signal to suppress an echo based on a first audio signal includes a computer...
8693677 Techniques for updating filter coefficients of an adaptive filter  
A technique for updating filter coefficients of an adaptive filter includes filtering a signal with an adaptive filter, whose filter coefficients are grouped into filter blocks. In this case a...
8693698 Method and apparatus to reduce non-linear distortion in mobile computing devices  
Techniques to reduce distortion in acoustic signals in mobile computing devices are described. For example, a mobile computing device may comprise a speaker operative to receive a first signal and...
8693678 Device and method for controlling damping of residual echo  
The present invention relates to a device, such as a communication device, comprising an adaptive foreground filter configured to calculate a first echo estimation signal based on a first input...
8687797 Method and system for a dual echo canceller  
Methods and systems for a dual echo canceller (EC) are disclosed and may include cancelling echo in utilizing a dual echo canceller, wherein said dual echo canceller includes an active echo...
8675883 Apparatus and associated methodology for suppressing an acoustic echo  
A new acoustic echo suppressor and method for acoustic echo suppression is described herein. Exemplary embodiments of the acoustic echo suppressor use one linear regression model for each subband....
8666058 Time domain adaptive filter bank for network echo reduction or cancellation  
In one or more embodiments, an echo reduction system can include multiple adaptive filters operable to provide estimated echo replicas based on received signal information coupled to respective...
8654967 System for conditioning echo response of loop start trunk line  
An echo canceling system has an adaptive filter connected to an echo source, for canceling echo from an echo path. A fixed echo conditioning filter is connected in series with the adaptive filter,...
8650010 Apparatus and method for generating a test signal with emulated crosstalk  
A signal generator produces a victim signal having crosstalk emulation by filtering and combining a victim signal waveform record file and an aggressor signal waveform record file generated using...
8644494 Echo canceler  
An echo canceler 10 generates an echo elimination signal by filtering through adaptive filters 101 and 102 reference signals input from sound sources causing echoes. It includes a sound source...
8644495 Echo canceler  
An echo canceler 10 generates an echo elimination signal by filtering through adaptive filters 101 and 102 reference signals input from sound sources causing echoes. It includes a sound source...
8634546 Signal processing device, echo canceller, and signal processing method  
If K=4N, wherein K is a number of subbands and N is a decimation ratio, an analysis filter process unit 21 is used to perform an analysis filter process for every N samples of real-valued input...
8634547 Echo canceller operative in response to fluctuation on echo path  
In a telephone device, a near-end signal processor delays each input near-end signal delivered from the respective microphones by a delay amount, and synthesizes the input near-end signals into a...
8630405 Echo removing apparatus  
An echo removing apparatus that can remove an echo appropriately if the produced sound volume becomes large although the configuration is simple is provided. A control section 17 switches the...
8625775 Method and system for reducing echo and noise in a vehicle passenger compartment environment  
An echo cancelling algorithm in a communication device initializes a step size value used in an adaptive echo filter based on a background noise signal power level relative to a power level of a...