公开(公告)号：US20150063579A1

公开(公告)日：2015-03-05

申请号：US14018635

申请日：2013-09-05

Applicant: Cisco Technology, Inc.

Inventor： Feng Bao ,  Subrahmanyam Venkata Kunapuli ,  Fei Yang ,  Xiangyu Bao ,  Tor A. Sundsbarm

IPC: G10K11/16

CPC classification number: H04M9/082 ,  G10K11/346

Abstract: Acoustic echo cancellation is improved by receiving a speaker signal that is used to produce audio in a room, and receiving audio signals that capture audio from an array of microphones in the room, including an acoustic echo from the speakers. To cancel the acoustic echo, one adaptive filter is associated with a corresponding subspace in the room. Each of the audio signals is assigned to at least one of the adaptive filters, and a set of coefficients is iteratively determined for each of the adaptive filters. The coefficients for an adaptive filter are determined by selecting each of the audio signals assigned to that adaptive filter and adapting the filter to remove an acoustic echo from each of the selected audio signals. At each iteration, a different audio signal is selected from the audio signals assigned to the adaptive filter in order to determine the set of coefficients.

Abstract translation: 通过接收用于在房间中产生音频的扬声器信号以及接收从房间中的麦克风阵列捕获音频的音频信号（包括来自扬声器的声学回声）来改善声学回声消除。 为了消除声学回声，一个自适应滤波器与房间中相应的子空间相关联。 每个音频信号被分配给至少一个自适应滤波器，并且针对每个自适应滤波器迭代地确定一组系数。 用于自适应滤波器的系数通过选择分配给该自适应滤波器的每个音频信号并且适配滤波器以从每个所选择的音频信号中去除声学回声来确定。 在每次迭代中，从分配给自适应滤波器的音频信号中选择不同的音频信号，以便确定该系数集合。