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1. 发明授权

US09530428B2 Echo cancellation device 有权
标题翻译：回声消除装置
公开(公告)号：US09530428B2
公开(公告)日：2016-12-27
申请号：US14767721
申请日：2013-05-14
申请人： MITSUBISHI ELECTRIC CORPORATION
发明人： Tomoharu Awano , Takashi Sudo , Atsuyoshi Yano , Atsushi Hotta
IPC分类号： G10L21/02 , G10L21/0208 , H04B3/23 , H04M9/08 , G10L25/18 , G10L21/0232
CPC分类号： G10L21/0208 , G10L21/0232 , G10L25/18 , G10L2021/02082 , H04B3/23 , H04M9/082
摘要： An echo cancellation device includes: a full-band echo canceller that generates a pseudo-echo signal; a downsample processor that downsamples a received signal and extracts a low-band component delayed by a delay amount D1; a delay controller that delays the low-band component by a delay amount D2; a delay controller that delays an output signal of the delay controller by a delay amount D3; a low-band echo canceller that generates a pseudo-echo signal delayed by a delay amount D1+D2; and an upsample processor that upsamples the low-band pseudo-echo signal to generate a full-band pseudo-echo signal delayed by the delay amount 2D1+D2. The delay controllers control the delay amounts D2 and D3 such that a tap length LA satisfies a condition of LA≧2D1+D2=D2+D3, the tap length LA indicating a response time of the adaptive filter in the full-band echo canceller.
摘要翻译：回波消除装置包括：产生伪回波信号的全频带回波消除器; 下采样处理器，对接收到的信号进行下采样并提取延迟延迟量D1的低频带分量; 延迟控制器，其将低频带分量延迟延迟量D2; 延迟控制器，其将所述延迟控制器的输出信号延迟延迟量D3; 产生延迟延迟量D1 + D2的伪回波信号的低频带回波消除器; 以及上采样处理器，其对低频伪回波信号进行上采样以产生延迟延迟量2D1 + D2延迟的全频带伪回波信号。延迟控制器控制延迟量D2和D3，使得抽头长度LA满足LA≥D21+ D2 = D2 + D3的条件，抽头长度LA指示全带回波消除器中的自适应滤波器的响应时间。

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