Free PDF A Perspective on Stereophonic Acoustic Echo Cancellation 4 (Springer Topics in Signal Processing)
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Published on: 2011-07-25
Released on: 2011-07-25
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Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these systems, more and more stereophonic sound devices with two loudspeakers and two microphones are deployed. Because of the coupling between loudspeakers and microphones, there may be strong echoes, which make real-time communication very difficult. The best way we know to cancel these echoes is via a stereo acoustic echo canceller (SAEC), which can be modelled as a two-input/two-output system with real random variables. In this work, the authors recast this problem into a single-input/single-output system with complex random variables thanks to the widely linear model. From this new convenient formulation, they re-derive the most important aspects of a SAEC, including identification of the echo paths with adaptive filters, double-talk detection, and suppression. allwords - MIT - Massachusetts Institute of Technology ... 22 22_2 23 24 25 26 27 28 29 2_22 2nd 3 3-Headed 3-headed 30 3000d_11 31 32 33 34 35 36 3600 3603 3670 37 38 39 3rd 4 40 41 42 43 4341 44 45 46 47 48 49 49 ...
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