Results 211 to 220 of about 1,828 (248)
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A multirate acoustic echo canceler structure
IEEE Transactions on Communications, 1995A new subband echo canceler (SBEC) structure is proposed to reduce the transmission delay introduced by conventional SBEC structures, without distorting the near-end signal. The proposed structure is based on computing two output errors, one for using during single-talk and the other one for using during double-talk periods.
Fumio Amano +3 more
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An acoustic echo canceller for teleconference systems
ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005We propose a parsimonious (economical) model of a room echo path as the cascade of a short FIR network and a long impulse response FIR filter in which almost-all the coefficients are kept to zero. The model automatically sets an efficient echo canceller structure.
José R. Casar Corredera +1 more
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Enhancement of Residual Echo for Robust Acoustic Echo Cancellation
IEEE Transactions on Audio, Speech, and Language Processing, 2012This paper examines the technique of using a noise-suppressing nonlinearity in the adaptive filter error feedback-loop of an acoustic echo canceler (AEC) based on the least mean square (LMS) algorithm when there is an interference at the near end. The source of distortion may be linear, such as local speech or background noise, or nonlinear due to ...
Ted S. Wada, Biing-Hwang Juang
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An adaptation control for acoustic echo cancellers
IEEE Signal Processing Letters, 1997Acoustic echo cancellation algorithms need a reliable adaptation control to cope with changing systems and nonstationary signals. A variable stepsize is proposed that is based on the detection of speakers' activities, and involves estimates of system parameters and background noise. Real-time experiments demonstrate the workability in practice.
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Acoustic Echo Cancellation Technique for VoIP
2015Acoustic Echo Canceller (AEC) is a crucial element to eliminate acoustic echo in a Voice over Internet Protocol (VoIP) communication. In the past, AEC have been implemented on Digital Signal Processing (DSP) platforms. This work uses software to perform the very demanding real-time signal processing that stack up against traditional implementation of ...
Balasubramanian Nathan +2 more
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An acoustic echo canceler with noise and echo reduction
Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 2004An acoustic echo canceler, needed for hands-free telecommunications in videoconferencing, has been realized with sufficient performance for use in a quiet meeting room. However, demand has been increasing for the use of hands-free teleconferencing in an environment with ambient noise such as conference calls in a noisy office or in a running automobile.
Sumitaka Sakauchi +4 more
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Limits for generalized sidelobe cancellers with embedded acoustic echo cancellation
2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002This paper analyzes positive synergies and theoretical limits of the combination of acoustic echo cancellation (AEC) and generalized sidelobe cancellers (GSC) for the removal of echoes of loudspeaker signals and local interferers. While the proposed system only requires one AEC for an arbitrary number of microphones, the array gain is limited by the ...
Wolfgang Herbordt, Walter Kellermann
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Gabor expansion for stereophonic acoustic echo cancellation
ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196), 2002In hands-free stereophonic devices, a stereo acoustic echo canceller is usually included. This however can exhibit convergence problems caused by the strong cross-correlation between the signals of the two channels. In this paper a new stereo acoustic echo cancellation structure based on the Gabor expansion is presented, which allows one to get better ...
L. Parolini +2 more
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A hybrid mono/stereo acoustic echo canceler
Proceedings of 1997 Workshop on Applications of Signal Processing to Audio and Acoustics, 1998In many applications, such as teleconferencing, multimedia workstations, televideo gaming, etc., stereo sound is already, or will soon be, implemented to give spatial realism that mono systems cannot offer. In such hands-free systems, stereophonic acoustic echo cancelers are absolutely necessary for full-duplex communication.
Jacob Benesty +2 more
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Acoustic recurrent neural networks echo cancellers
Proceedings of the International Joint Conference on Neural Networks, 2003., 2004This paper presents an acoustic echo canceller using recurrent neural networks techniques. The simulation results are based on the echo return loss enhancement (ERLE). Performance index indicate that the proposed echo canceller has a good performance and compares favorably with other proposed neural acoustic echo canceller schemes.
Pedro H. G. Coelho, Luiz Biondi Neto
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