For many decades, hybrid devices have been used to connect 2-wire local circuits and 4-wire long distance circuits in telephone lines. This leads to a weIl known problem, whereby echoes are generated. The delay introduced by telecommunication satellites exacerbated this problem and the need for new methods of echo control soon became obvious. The best solution to date for solving this problem was invented in the 1960s at Bell Labs by Kelly, Logan, and Sondhi, and consists of identifying the echo path generated by the hybrid by means of an adaptive filter, a technique that became known as an echo canceler. The echo canceler allowed full-duplex communication which was not possible with older echo suppression techniques. Later, with the development of hands-free teleconferencing systems, an other echo problem appeared; but this time the echo was due to the coupling between the loudspeaker and microphone. It is not surprising that the same solution was proposed to solve this problem, and most of today's telecon ferencing systems have an acoustic echo canceler. More recently, attention has been given to the very interesting problem of multichannel acoustic echo cancellation, which leads to more exciting applications that take advantage of our binaural auditory system.

Presents many new ideas and how they work in practice Interesting both from the theoretical and the practical viewpoint

Klappentext
This book brings together many advanced topics in network and acoustic echo cancellation which are aimed towards enhancing the echo cancellation performance of next-generation telecommunication systems. The general subject nature relates to algorithms with increased convergence speed, improved detection of double-talk from near-end speech, robust immunity to undetected double-talk, increased computational efficiency, and multi-channel capability. The resulting compendium provides a coherent treatment of such topics not found otherwise in journals or other books. The chapters are related with a common terminology, but still can be read independently.

Inhalt

1. An Introduction to the Problem of Echo in Speech Communication.- 2. A Family of Robust PNLMS-Like Algorithms for Network Echo Cancellation.- 3. A Robust Fast Recursive Least-Squares Adaptive Algorithm.- 4. Dynamic Resource Allocation for Network Echo Cancellation.- 5. Multichannel Acoustic Echo Cancellation.- 6. A Fast Normalized Cross-Correlation DTD Combined with a Robust Multichannel Fast Recursive Least-Squares Algorithm.- 7. Some Practical Aspects of Stereo Teleconferencing System Implementation.- 8. General Derivation of Frequency-Domain Adaptive Filtering.- 9. Multichannel Acoustic Echo and Double-Talk Handling: A Frequency-Domain Approach.- 10. Linear Interpolation Applied to Adaptive Filtering.- References.