In this paper we present an overview about several approaches for controlling the step size
for adaptive echo cancellation filters in hands-free telephones. First an optimal step size is …

We have discussed the application of high-order adaptive filters to the problem of acoustical
echo cancellation with particular application to hands free telephone systems. We described …

The frequency-domain Kalman filter (FDKF) was successfully applied in echo-cancelation
systems due to its fast initial convergence and robustness to double-talk. However, the …

A stereo teleconferencing system provides a more realistic presence compared to monaural
systems. It helps listeners distinguish who is talking at the other end by means of spatial …

The article reviews, with technical depth, the history of research in audio and
electroacoustics, including electroacoustic devices, noise control, echo cancellation, and …

Methods and apparatus for automatic gain and time delay computations between multiple
sensors. In exemplary embodiments, one sensor is treated as a reference sensor with …

A new configuration for a stereo echo canceller with nonlinear pre-processing is proposed.
The pre-processor which adds uncorrelated components to the original received stereo …

This paper proposes a new method to reduce residual echo for multichannel acoustic echo
cancelers (AECs). This method estimates complex-valued residual echo and corrects its …

A time-domain Kalman filter, namely the broadband Kalman filter, was proposed for acoustic
system identification to bridge between the exact Kalman filter and normalized least-mean …

Adaptive filters for echo cancellation generally need update control schemes to avoid
divergence in case of significant disturbances. The two-path algorithm avoids the problem of …