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7359521 |
Aliasing cancellation in audio effects algorithms
A method for effecting aliasing cancellation in an audio effects algorithm using a delay modulated signal, derived from interpolation of a delay modulator at an instantaneous sampling frequency,...
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7352858 |
Multi-channel echo cancellation with round robin regularization
A method and system of multi-channel echo cancellation using round robin regularization. The multi-channel round robin regularization echo cancellation method includes applying a plurality of...
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7352687 |
Mixed domain cancellation
A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals in a multi-channel environment are manipulated into a...
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7333605 |
Acoustic echo cancellation with adaptive step size and stability control
An acoustic echo canceller having an adaptive filter, a step size control unit, and (optionally) a stability control unit. The adaptive filter derives an estimate of the echo in a near-end signal...
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7330738 |
Apparatus and method for canceling residual echo in a mobile terminal of a mobile communication system
An apparatus for canceling an echo signal in a mobile terminal of a mobile communication system. A double talk detector (DTD) receives a first signal by canceling an estimated echo signal from a...
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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...
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7321568 |
Realtime management of processing resources
The invention presents a software agent that optimizes processing resources for multiple instances of a software module that are executing simultaneously. The agent allocates and distributes...
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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...
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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...
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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...
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7298838 |
Adaptive cancellation network system and method for digital subscriber line
A method for reducing transmit echo in a DSL modem comprises selecting at least one cancellation device of a plurality of cancellation devices. An attenuation signal is generated using the selected...
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7280654 |
Modified affine projection algorithm for non-stationary signal
An affine projection or like algorithm is used to process a non-stationary signal. The affine projection algorithm creates an inverse matrix and includes a factor γ to avoid numerical instability...
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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...
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7260213 |
Telephone echo canceller
The invention relates to an echo canceling device and method for an arrangement for transmitting audio signals, in particular uttered speech with an echo filter for canceling echo. The echo filter...
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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...
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7242762 |
Monitoring and control of an adaptive filter in a communication system
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...
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7231234 |
Method and apparatus for reducing echo in a communication system
A method and apparatus for reducing echo in a communication system are provided. A first signal including a voice component associated to a speaker is received. The first signal is processed to...
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7231036 |
Anti-howling circuit detecting howling from effect of predicted echo signal
In a system in which echo transferred from a received signal to an outgoing signal is canceled by subtracting an adaptively predicted echo signal from the outgoing signal, howling is detected by...
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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...
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7215765 |
Method and apparatus for pure delay estimation in a communication system
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...
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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...
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7209566 |
Method and apparatus for determining a nonlinear response function for a loudspeaker
A nonlinear response function of a loudspeaker is determined by an iterative process during which the nonlinear response function and a linear response associated with an echo and microphone are...
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7206404 |
Communications system and method utilizing centralized signal processing
A communications system and method performs centralized signal processing on received audio signals. A plurality of terminals are coupled to a processing switch via links. The terminals can be, for...
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7203308 |
Echo canceller ensuring further reduction in residual echo
An echo canceller includes: an echo cancellation part canceling echo included in a near-end input signal; a noise suppression part employing a low-pass filter having a variable cut-off frequency...
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7200221 |
Methods and systems for providing multi-path echo cancellation
Providing multi-path echo cancellation comprises providing a main echo signal corresponding to a main echo section of an echo response and providing a plurality of tail echo signals, each of the...
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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...
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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...
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7181001 |
Apparatus and method for echo cancellation
An apparatus and method for echo cancellation that detects and tracks the active regions of the echo channel impulse response rather than the entire echo channel impulse response and uses this...
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7158632 |
Adaptive scaling and echo reduction
A method, apparatus, and system for scaling a value of an amplitude to a binary value and a method, apparatus and system for reducing an undesirable portion of a signal.
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7158631 |
Efficient echo cancellation techniques
Techniques to cancel echo utilizing reduced die space and reduced usage of a time shared processor.
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7155018 |
System and method facilitating acoustic echo cancellation convergence detection
A system and method facilitating acoustic echo cancellation convergence detection is provided. The invention includes an acoustic echo cancellation convergence detector having a center clipping...
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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...
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7142665 |
Automatic gain control for an adaptive finite impulse response and method therefore
Methods and apparatus are provided for an echo cancellation system. The echo cancellation system comprises an automatic gain control (AGC), a first scalar, a second scalar, a signal summing stage,...
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7139342 |
System and method for cancelling signal echoes in a full-duplex transceiver front end
There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a...
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7099821 |
Separation of target acoustic signals in a multi-transducer arrangement
The present invention provides a process for separating a good quality information signal from a noisy acoustic environment. The separation process uses a set of at least two spaced-apart...
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7099460 |
Echo suppression and echo cancellation
Echo canceling method including the steps of determining an Euclidean norm of an echo-replica signal, determining an Euclidean norm of an input signal, determining a gradient step size, correcting...
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7088832 |
IFB system apparatus and method
The present invention provides a cancellation signal which may be combined with a radio or television program signal to provide a mix minus signal for use in IFB communication with the talent. A...
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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...
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7085245 |
Coefficient domain history storage of voice processing systems
A method and apparatus for canceling a near-end echo of a far-end signal for each channel of a voice over packet multi-channel communications gateway. The invention applies “off-the-shelf”...
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7075974 |
Multi-path detection circuit and method for a CDMA receiver
In a multi-path detection circuit for use in a CDMA communication system, a first peak is detected by searching a maximum value over a whole of data blocks composed of delay profile data. A second...
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7072466 |
Method and apparatus for canceling echo in a telephone communication system
Method and apparatus for signal reflection removal, such as echo cancellation, is described. Signal samples are delayed. The delays allow burst processing of consecutive samples of transmitting and...
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7072465 |
Adaptive filter for network echo cancellation
A robust adaptive filter for use in a network echo canceller or other digital signal processing application utilizes a coefficient vector update device that, through the application of fast...
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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...
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7065207 |
Controlling attenuation during echo suppression
An echo canceling system receives and transmits audio signals between a far end and a near end. During single talk, which is when only one end is originating audio, the path back to the originator...
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7065056 |
Transceiver circuit including an echo canceller
A circuit for transmitting and receiving communications. The circuit includes a transmit block, a receive block, and an echo canceller, coupled to the transmit block and to the receive block, for...
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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...
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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...
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7062038 |
System and method of using two coefficient banks in an adaptive echo canceller
A device has a first echo canceller having a first bank of coefficients to be applied to a reference signal to produce a first echo prediction signal, and a first arithmetic unit to combine the...
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7058185 |
Acoustic echo and noise cancellation
Stereo echo cancellation is necessary to overcome the objections observed by, for example, teleconferencing, voice controlled video/audio apparatuses, etc. To improve the existing filters, an...
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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...
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