Abstract:
This paper reviews the problems associated with the application of acoustic echo cancellation to duplex hands-free audio communication. The more popular approaches to the solution of these problems are reviewed as well. In particular, the problems discussed include the effects of communication channels on the human perception of echo, characteristics of the acoustic echo path, double-talk, and stability. The methods which address these obstacles are fast-converging, low-complexity long adaptive filters, double-talk detectors, and suppression and clipping techniques.