Development of DSP Based Network Echo Cancellers

Adaptive filtering is an important area of digital signal processing and is one of the main topics in the digital signal processing classrooms. Echo cancellation is a typical example used to introduce adaptive filtering algorithms. In this paper, filling the gap between the understanding of adaptive filtering theory and the knowledge and skills needed to build a practical echo canceller is attempted. The necessary knowledge and skills (such as algorithm design, implementation on DSP platforms, debugging, performance analysis and testing) for developing a high-performance network echo cancellers are covered.