By Jacob Benesty, Tomas Gänsler, Dennis R. Morgan, M. Mohan Sondhi, Steven L. Gay (auth.)
This publication brings jointly many complex subject matters in community and acoustic echo cancellation that are aimed in the direction of bettering the echo cancellation functionality of next-generation telecommunication platforms. the overall topic nature pertains to algorithms with elevated convergence pace, more advantageous detection of double-talk from near-end speech, strong immunity to undetected double-talk, elevated computational potency, and multi-channel power. The ensuing compendium offers a coherent remedy of such issues now not chanced on differently in journals or different books. The chapters are comparable with a standard terminology, yet nonetheless should be learn independently.
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Extra resources for Advances in Network and Acoustic Echo Cancellation
These techniques include the concept of "center clipping" [95J and frequencyseleetive suppression using low-order adaptive transversal filters , [128J. Selective echo suppression [95J can also be applied within the strueture of subband acoustic echo cancelers, to be discussed later. All of the aforementioned approaches attempt to improve convergence speed without adding too much computational complexity. Recently, subband techniques have been developed to reduce the computational complexity of acoustic echo cancelers with long impulse responses, while at the same time providing more favorable circumstances for fast convergence.
For one, faster convergence is generally realized since the step size can be independently optimized for each frequency component. , are encountered in acoustic echo cancellation: multiplication replaces convolution in the adaptive filter, so greater computational efficiency is possible. One disadvantage of this approach is the associated block delay. However, this shortcoming can be moderated by using shorter blocks with multi-tap frequency-domain adaptive filters, a technique known as multi-delay jiltering (MDF).
Hardware implementations based on these proposals have been in use since the mid-1980s. Given the pace of development of digital technology, the next decade may well see widespread use of acoustic echo cancelers for offices and larger conference rooms, for both monophonie and stereophonie sound. In this chapter, we have introduced the major themes for echo control in speech communication. Along the way, certain topics were keyed to advanced topics covered in the following chapters of this book.
Advances in Network and Acoustic Echo Cancellation by Jacob Benesty, Tomas Gänsler, Dennis R. Morgan, M. Mohan Sondhi, Steven L. Gay (auth.)