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1.发明申请System and Method for Clock Synchronization of Acoustic Echo Canceller (AEC) with Different Sampling Clocks for Speakers and Microphones 有权用于扬声器和麦克风的不同采样时钟的声学回声消除器（AEC）的时钟同步的系统和方法公开(公告)号：US20140112466A1
公开(公告)日：2014-04-24
申请号：US13657908
申请日：2012-10-23
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Feng Bao , J. William Mauchly , Subrahmanyam Kunapuli , Xiangyu Bao
CPC classification number: H04R1/2869 , H04M9/082
Abstract: Clock synchronization for an acoustic echo canceller (AEC) with a speaker and a microphone connected over a digital link may be provided. A clock difference may be estimated by analyzing the speaker signal and the microphone signal in the digital domain. The clock synchronization may be combined in both hardware and software. This synchronization may be performed in two stages, first with coarse synchronization in hardware, then fine synchronization in software with, for example, a re-sampler.
Abstract translation: 可以提供具有通过数字链路连接的扬声器和麦克风的声学回声消除器（AEC）的时钟同步。 可以通过分析数字域中的扬声器信号和麦克风信号来估计时钟差。 时钟同步可以在硬件和软件两者中组合。 该同步可以分两个阶段执行，首先是硬件中的粗略同步，然后在软件中与例如重新采样器进行精细同步。
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Patent Agency Ranking
公开(公告)号：US20150381902A1
公开(公告)日：2015-12-31
申请号：US14315937
申请日：2014-06-26
Applicant: Cisco Technology, Inc.
Inventor： Xiangyu Bao , Thomas Fussy , Vladimir Stepin
CPC classification number: H04N5/2621 , H04N5/2624 , H04N5/2628 , H04N7/147 , H04N7/15
Abstract: In one implementation, at least two images are captured from a respective at least two cameras of a telepresence system. The at least two cameras have horizontally overlapping fields of view such that the at least two images horizontally overlap. A processor identifies, by image processing of the overlap of the at least two images, portions of each of the at least two images. The portions spatially correspond to adjacent displays and do not include the overlap. Subsequent images captured by the at least two cameras are displayed on the adjacent displays in a video conference. The displayed images are for the portions of the field of view corresponding to the adjacent displays
Abstract translation: 在一个实现中，从远程出席系统的相应的至少两个照相机捕获至少两个图像。 所述至少两个相机具有水平重叠的视场，使得所述至少两个图像水平重叠。 处理器通过对至少两个图像的重叠的图像处理来识别至少两个图像中的每一个的部分。 这些部分在空间上对应于相邻显示器，并且不包括重叠。 由视频会议在相邻显示器上显示由至少两个照相机拍摄的后续图像。 所显示的图像用于对应于相邻显示器的视场的部分
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3.发明授权System and method for clock synchronization of acoustic echo canceller (AEC) with different sampling clocks for speakers and microphones 有权用于扬声器和麦克风的不同采样时钟的声学回声消除器（AEC）的时钟同步的系统和方法公开(公告)号：US09025762B2
公开(公告)日：2015-05-05
申请号：US13657908
申请日：2012-10-23
Applicant: Cisco Technology, Inc.
Inventor： Feng Bao , J. William Mauchly , Subrahmanyam Kunapuli , Xiangyu Bao
CPC classification number: H04R1/2869 , H04M9/082
Abstract: Clock synchronization for an acoustic echo canceller (AEC) with a speaker and a microphone connected over a digital link may be provided. A clock difference may be estimated by analyzing the speaker signal and the microphone signal in the digital domain. The clock synchronization may be combined in both hardware and software. This synchronization may be performed in two stages, first with coarse synchronization in hardware, then fine synchronization in software with, for example, a re-sampler.
Abstract translation: 可以提供具有通过数字链路连接的扬声器和麦克风的声学回声消除器（AEC）的时钟同步。 可以通过分析数字域中的扬声器信号和麦克风信号来估计时钟差。 时钟同步可以在硬件和软件两者中组合。 该同步可以分两个阶段执行，首先是硬件中的粗略同步，然后在软件中与例如重新采样器进行精细同步。
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4.发明授权Acoustic echo cancellation for microphone array with dynamically changing beam forming 有权用于具有动态变化的波束形成的麦克风阵列的声学回波消除公开(公告)号：US09549079B2
公开(公告)日：2017-01-17
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
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。
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公开(公告)号：US09451179B2
公开(公告)日：2016-09-20
申请号：US14315937
申请日：2014-06-26
Applicant: Cisco Technology, Inc.
Inventor： Xiangyu Bao , Thomas Fussy , Vladimir Stepin
CPC classification number: H04N5/2621 , H04N5/2624 , H04N5/2628 , H04N7/147 , H04N7/15
Abstract: In one implementation, at least two images are captured from a respective at least two cameras of a telepresence system. The at least two cameras have horizontally overlapping fields of view such that the at least two images horizontally overlap. A processor identifies, by image processing of the overlap of the at least two images, portions of each of the at least two images. The portions spatially correspond to adjacent displays and do not include the overlap. Subsequent images captured by the at least two cameras are displayed on the adjacent displays in a video conference. The displayed images are for the portions of the field of view corresponding to the adjacent displays.
Abstract translation: 在一个实现中，从远程出席系统的相应的至少两个照相机捕获至少两个图像。 所述至少两个相机具有水平重叠的视场，使得所述至少两个图像水平重叠。 处理器通过对至少两个图像的重叠的图像处理来识别至少两个图像中的每一个的部分。 这些部分在空间上对应于相邻显示器，并且不包括重叠。 由视频会议在相邻显示器上显示由至少两个照相机拍摄的后续图像。 所显示的图像用于对应于相邻显示器的视场的部分。
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6.发明申请Acoustic Echo Cancellation for Microphone Array with Dynamically Changing Beam Forming 有权具有动态变化的波束形成的麦克风阵列的声学回声消除公开(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。
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