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Thesis On Acoustic Echo Cancellation - Appletree Court

Gay, Advances in Network and Acoustic Echo Cancellation, Springer-Verlag, 2001.

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Acoustic Echo Cancellation Algorithms and ..

Several methods are presented in this thesis, addressing various acoustic echo cancellation areas such as doubletalk detection, stereophonic acoustic echo cancellation and ordinary acoustic echo cancellation.

Thesis On Acoustic Echo Cancellation - …



While some of the results are basically extensions of existing acoustic echo cancellation algorithms, others are more innovative in the sense that they offer solutions to previously unsolved problems or outperform by far existing algorithms.

Acoustic echo cancellation phd thesis | ISMSi

If the attenuation of the echoes is small, as it is in a hands-free telephony setup, good acoustic echo cancellation is required for the setup to work well.



On particular area where system identification is needed is the aforementioned acoustic echo cancellation application, where models of the acoustic paths between the loudspeakers and the microphones need to be determined.

Subband acoustic echo cancellation - Curtin University

Acoustic echo cancellation can be used to remove the annoying talker feedback in hands-free (teleconferencing) systems. The echo canceller identifies the response between the loudspeaker and the microphone, and produces an echo replica which is then subtracted from the signal. Adaptive filtering techniques are employed to determine the echo path response. The speech signal (or the reference signal) is used to train the algorithm. Fast convergence and good tracking capabilities can not be achieved by classical transform domain adaptive filtering algorithms when the reference signal has variable rank autocorrelation matrix. In this thesis, we examine the DCT-LMS algorithm and we emphasize on the role played by the Discrete Cosine Transform. This fixed transformation reduces the eigenvalue spread of the input autocorrelation matrix by partially decorrelating the inputs.



This thesis is partly about acoustic echo cancellation which has the purpose to remove the acoustic echoes from the loudspeaker sound signals picked up by the microphones in hands-free telephony systems.

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  • A cepstrum-based acoustic echo cancellation technique …

    In this thesis we develop adaptive filtering techniques for noise reduction and acoustic feedback cancellation

  • On System Identification & Acoustic Echo Cancellation

    Fu, Jing (2007) New approaches for nonlinear acoustic echo cancellation. Masters thesis, Concordia University.

  • Delay Estimation for Transform Domain Acoustical Echo Cancellation

    This article introduces a basic acoustic echo canceller based on the Least Mean Squares (LMS) algorithm.

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ios - Acoustic Echo Cancellation(AEC) on mobile with …

Simulation results demonstrate the efficiency of SDU for acoustic echo cancellation, the gain in Echo Return Loss is substantial. The experimental performance analysis confirms the expected reduction in the Euclidean Distance between the filter weights and the actual room impulse response DCT. Furthermore, it shows that spectrally updating the filter weights reduces the MSE jump when the autocorrelation matrix gains full rank.

Acoustic Echo Cancellation(AEC) on mobile with Adobe Flash Builder ..

Furthermore, in recent years new applications such as Internet Protocol (IP) telephony and stereophonic hands-free telephony have emerged that also require echo cancellation in order to function properly.

Acoustic Echo Cancellation in AIR Mobile on iOS ..

Acoustic Echo Cancellation Algorithms and Implementation on the TMS320C8x David Qi Digital Signal Processing Solutions SPRA063 May 1996 Printed on Recycled PaperImplementation of an acoustic echo canceller using MATLABImplementation of an acoustic echo canceller using Srinivasaprasath, quot;Implementation of an acoustic echo canceller using MATLAB digital wireless subscribers Echo Cancellation – VOCAL TechnologiesEcho cancellation enhances speech for mobile, voip voice amp; radio communication applications. Visit us to learn more about our network echo cancellerAcoustic echo cancellation phd thesis ISMSiThis thesis deals with two areas related to hardware implementation of cus- tom digital The acoustic echo canceller chip has been PhD THESIS. ACOUSTIC ECHO NLMS Adaptive Filter Based Acoustic Echo Canceller Korea NLMS Adaptive Filter Based Acoustic Echo Canceller – AEC; NLMS Adaptive Filter Based Acoustic Echo In this paper, we study real time AEC (acoustic echo AN ECHO CANCELLER USING SMOOTHED-COEFFICIENT FILTER WITH AN ECHO CANCELLER USING SMOOTHED-COEFFICIENT FILTER WITH ADAPTIVE TIME CONSTANT CONTROLLED BY HIGH-PASS ERRORS Osamu Hoshuyama Common Platform Software Research Echo cancellation on communication circuitsECHO CANCELLATION ON COMMUNICATION CIRCUITS An echo canceller has been designed for D/A digital to analogue conversion ERLE echo return loss enhancement Echo Cancellation SpringerLinkEcho is the repetition of a wave due to reflection from points where the characteristics of the material through which the wave propagates changes.Wideband Self-Adaptive RF Cancellation Circuit for Full Wideband Self-Adaptive RF Cancellation Circuit for Abstract This paper presents a novel RF circuit architecture stage as well as in the digital canceller.DESIGNING AN ECHO CANCELLER SYSTEM USING THE TMS320C50 DSPSolution Challenge 1995 European Team Papers. It Designing an Echo Canceller System Using the TMS320C50 DSP Digital Signal Processing SolutionsEcho cancellation on communication circuitsECHO CANCELLATION ON COMMUNICATION CIRCUITS An echo canceller has been designed for D/A digital to analogue conversion ERLE echo return loss enhancement

"Acoustic echo cancellation (AEC) is a well studied problem

This thesis presents some solutions to non-linear acoustic echo cancellation using loudspeaker pre-processing. We first investigate an experimental and theoretical analysis of linear acoustic echo cancellation behaviour in non-linear environment. The analysis shows that linear echo cancellation performance is degraded by the presence of non-linearities. This leads to the requirement of non-linear solutions. In the first step, measurements taken from a real mobile phone confirm that the loudspeaker is the major source of non-linearities. The same measurements are then used to characterise and model a loudspeaker. In the second step, the loudspeaker model is used in two different structures for loudspeaker pre-processing to improve linear acoustic echo cancellation performance. Two new algorithms are then proposed. In the first structure the pre-processor is placed before the linear acoustic echo canceller. It aims to emulate loudspeaker behaviour so that non-linearities are taken into account by the linear echo canceller. An improved version of this structure is then proposed. It combines clipping compensation in the pre-processor and decorrelation filtering in the linear acoustic echo canceller. The objective is to improve the convergence and the tracking capability of the linear acoustic echo canceller. In the second structure the pre-processor is placed before the loudspeaker. In this case the pre-processor aims to linearise the loudspeaker output which results in more efficient linear acoustic echo cancellation. Finally, we propose a comparative analysis of the different non-linear acoustic echo cancellers.

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