By Jacob Benesty, Tomas Gänsler, Dennis R. Morgan, M. Mohan Sondhi, Steven L. Gay (auth.)

This publication brings jointly many complicated issues in community and acoustic echo cancellation that are aimed in the direction of improving the echo cancellation functionality of next-generation telecommunication platforms. the final topic nature pertains to algorithms with elevated convergence velocity, better 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 themes now not came across in a different way in journals or different books. The chapters are similar with a typical terminology, yet nonetheless might be learn independently.

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When the DTD detects double-talk, adaptation of s(n) should be inhibited for a specific time, preferably as long as the DTD hangover interval, thold. Moreover, doubletalk may have already affected s( n) (biased it towards an unacceptably large value) by the time it is detected. We therefore let the sc ale estimate decay towards a minimum value Smin. 5, ensures that any disturbance of the scale estimate slowly decays when double-talk has been detected. 23) S where S is the scale factor and Al is a forgetting factor.

40) using the half-wave nonlinearity can also be interpreted as the addition of a full-wave nonlinearity, after making suitable scaling changes. 3, is hardly noticeable for speech. This is at first surprising because, usually, such high distortion is objectionable in high-fidelity audio systems. One explanation for why speech is not greatly degraded is that the distortion for vowel-like sounds is comprised of harmonics that tend to be masked by corresponding harmonics of the original signal. Masking is a we11-known psychoacoustic phenomenon by which one sound covers up another, and is also used to advantage in perceptual audio coding.

These applications include multiparty room-to-room conferencing, multiparty desktop conferencing, and interactive video gaming involving multichannel sound. In these multichannel applications, there are multiple acoustic paths from multiple loudspeakers to multiple microphones, and echo es arising from these paths must be cancelled for fuB-duplex communication. As we shall see, there are unexpected complications with multichannel sound that do no not occur in single-channel cancelers. As an introduction to the fundamental problem of multichannel acoustic echo canceBation, consider the room-to-room stereo conferencing scenario of Fig.

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