Echo Cancellation for Speech Signals

Abstract

The sections in this article are Line Echoes Adaptive Cancellation Single‐Channel Acoustic Echo Cancellation Multichannel Acoustic Echo Cancellation Concluding Remarks Acknowledgments

Optimal and Adaptive Microphone Arrays for Speech Input in Automobiles

“…Room reverberation is most effectively handled using array techniques or by proper microphone design and placement. Acoustic feedback for hands-free mobile telephony is usually addressed by conventional echo cancellation techniques [12], [13], [14], [15] although subband echo cancellation has caught a lot of attention lately, see for instance [15] and [16].…”

A multi-resolution filtered-x LMS algorithm based on discrete wavelet transform for active noise control

“…They claimed that their method can work better than conventional FXLMS algorithm and providing a powerfully better tracking abilities compare to both the conventional FXLMS and filter-x recursive least square (FXRLS) algorithms. To increase the convergence rate for LMS-based ANC algorithm, the method of sub-band is applied to the ANC system [12,13]. Nevertheless, a substantial delay in the secondary path will be introduced.…”

On computationally-efficient NLMS-based algorithms for echo cancellation applications

“…It is, therefore, desirable to cancel or at least significantly reduce such echoes to enhance speech conversation quality. Currently, this can be achieved using adaptive echo cancellation approach [8].…”

“…The trend is to use double talk detector (DTD) to detect when the two conversation parties are talking at the same time and stop the adaptation of the adaptive filter to avoid divergence. Such a situation is called coefficient freezing [8]. The design of DTD can be found in [10].…”