Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Echo cancellation"”.
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Stereophonic Acoustic Echo Cancellation: Theory and Implementation
… implementation aspects for stereophonic acoustic echo cancellation. In Paper I a complete implementation of a stereophonic acoustic echo canceler based on the two-channel fast recursive least-squares algorithm is presented. An analysis of the system calculation complexity is also given, in …
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3D echo cancellation in a home environment
… and compare various algorithms for the cancellation of echoes in a home environment, where the room impulse response is unknown and variable. The general problem, where the speaker's movements are completely unrestricted, is a very hard one, and research in this area has only begun in …
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Implementation and evaluation of echo cancellation algorithms
Echo in telephones is generally undesirable but inevitable. There are two possible sources of echo in a telephone system. The impedance mismatch in hybrids generates network (electric) echo. The acoustic coupling between loudspeaker and microphone, in hands-free telephones, produces acoustic echo. …
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Exploration of alternative algorithms for multi-channel acoustic echo cancellation
Multi-Channel Acoustic Echo cancellation (MCAEC) is a vital component of delivering clean speech to a virtual personal assistant through a smart speaker with multi-channel audio (stereophonic, etc). The use of the Kalman filter as an alternative adaptive filter methodology for this MCAEC …
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Optimal Algorithms for Blind Source Separation - Application to Acoustic Echo Cancellation
… that creates such interesting problems. Acoustic echo is inevitable whenever a speaker is placed near to a microphone in a general full-duplex communication application. The most common communication scenario is the hands-free mobile communication kits for a car. For example, the voice from the …
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Fast Algorithms for Volterra-Series-Based Nonlinear Adaptive Filters
… through the previous chapters are applied to echo cancellation for a 256-QAM full-duplex digital transmission system and to acoustic echo cancellation. The computer simulation results and their performance comparisons are presented in this chapter.
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Sparse nonlinear optimization for signal processing and communications
… nonlinear optimization algorithms for network echo cancellation (NEC), 3-D synthetic aperture radar (SAR) image reconstruction, and adaptive turbo equalization in multiple-input multiple-output (MIMO) underwater acoustic (UWA) communications, respectively.</p> <p>For NEC, the proposed two …
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On Ways to Improve Adaptive Filter Performance
… used in a wide range of applications, including echo cancellation, adaptive equalization, adaptive noise cancellation, and adaptive beamforming. The performance of an adaptive filtering algorithm is evaluated based on its convergence rate, misadjustment, computational requirements, and numerical …
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Graphical model driven methods in adaptive system identification
… in applications such as channel identification, echo cancellation and adaptive equalization demonstrate that the gains admitted by the graph framework are realizable in practice. The methods have wide applicability, and in particular show promise as the estimation and adaptation algorithms for a …
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Graphical model driven methods in adaptive system identification
… in applications such as channel identification, echo cancellation and adaptive equalization demonstrate that the gains admitted by the graph framework are realizable in practice. The methods have wide applicability, and in particular show promise as the estimation and adaptation algorithms for a …
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Switching adaptive filter structures for improved performance
… identification application, in particular for echo cancellation, show the expected result of providing faster convergence and lower mean square error than would be possible with a single algorithm. The switching system demonstrates other important results: it can avoid the numerical instability …
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An investigation of the utility of monaural sound source separation via nonnegative matrix factorization applied to acoustic echo and reverberation mitigation for hands-free telephony
… MSSS via NMF as an alternative acoustic echo reduction approach to existing approaches such as Acoustic Echo Cancellation (AEC). To this end, we present the single-channel acoustic echo problem as an MSSS problem, in which the objective is to extract the users signal from a mixture also …
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Adaptive filters for sparse system identification
<p>"Sparse system identification has attracted much attention in the field of adaptive algorithms, and the adaptive filters for sparse system identification are studied. Firstly, a new family of proportionate normalized least mean square (PNLMS) adaptive algorithms that improve the performance of …