发明名称 |
CONTROLLING ECHO IN THE CODED DOMAIN |
摘要 |
<p>A method and corresponding apparatus for coded-domain acoustic echo control is presented. An echo control problem is considered as that of perceptually matching an echo signal to a reference signal. A perceptual similarity function that is based on the coded spectral parameters produced by the speech codec is defined. Since codecs introduce a significant degree of non-linearity into the echo signal, the similarity function is designed to be robust against such effects. The similarity function is incorporated into a coded-domain echo control system that also includes spectrally-matched noise injection for replacing echo frames with comfort noise. Using actual echoes recorded over a commercial mobile network, it is shown herein that the similarity function is robust against both codec non-linearities and additive noise. Experimental results further show that the echo-control is effective at suppressing echoes compared to a Normalized Least Mean Squared (NLMS)-based echo cancellation system.</p> |
申请公布号 |
WO2009029076(A1) |
申请公布日期 |
2009.03.05 |
申请号 |
WO2007US22286 |
申请日期 |
2007.10.19 |
申请人 |
TELLABS OPERATIONS, INC.;SUKKAR, RAFID, A. |
发明人 |
SUKKAR, RAFID, A. |
分类号 |
H04M9/08 |
主分类号 |
H04M9/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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