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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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公开(公告)号：US20150201278A1
公开(公告)日：2015-07-16
申请号：US14154975
申请日：2014-01-14
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Feng Bao , Subrahmanyam Kunapuli , Fei Yang , Tor Sundsbarm
CPC classification number: H04R3/005 , H04M3/568 , H04M2203/509 , H04N7/15
Abstract: A processing system can include tracking microphone array(s), audio-tracking circuitry configured to detect a location of audio sources from audio signals from the array(s), and processing circuitry. The processing circuitry can be configured to: identify a first microphone that has a strongest signal strength; estimate a location of an active speaker based on at least an output of the audio-tracking circuitry; determine whether a second microphone for the active speaker is affected by an acoustic obstacle based on the location of the active speaker and a location of the first microphone that has the strongest signal strength; estimate attenuation for microphones based on a comparison of actual signal strengths of the microphones with estimated signal strengths of the microphones that are estimated based on microphone signals of the second microphone for the active speaker; and modify the attenuation based on an estimated location of the acoustic obstacle.
Abstract translation: 处理系统可以包括跟踪麦克风阵列，被配置为从来自阵列的音频信号和处理电路检测音频源的位置的音频跟踪电路。 处理电路可以被配置为：识别具有最强信号强度的第一麦克风; 至少基于音频跟踪电路的输出来估计有源扬声器的位置; 基于有源扬声器的位置和具有最强信号强度的第一麦克风的位置，确定主动扬声器的第二麦克风是否受到声学障碍物的影响; 基于麦克风的实际信号强度与基于用于主动扬声器的第二麦克风的麦克风信号估计的麦克风的估计信号强度进行比较来估计麦克风的衰减; 并且基于声学障碍物的估计位置来修改衰减。
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公开(公告)号：US09451360B2
公开(公告)日：2016-09-20
申请号：US14154975
申请日：2014-01-14
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Feng Bao , Subrahmanyam Kunapuli , Fei Yang , Tor Sundsbarm
CPC classification number: H04R3/005 , H04M3/568 , H04M2203/509 , H04N7/15
Abstract: A processing system can include tracking microphone array(s), audio-tracking circuitry configured to detect a location of audio sources from audio signals from the array(s), and processing circuitry. The processing circuitry can be configured to: identify a first microphone that has a strongest signal strength; estimate a location of an active speaker based on at least an output of the audio-tracking circuitry; determine whether a second microphone for the active speaker is affected by an acoustic obstacle based on the location of the active speaker and a location of the first microphone that has the strongest signal strength; estimate attenuation for microphones based on a comparison of actual signal strengths of the microphones with estimated signal strengths of the microphones that are estimated based on microphone signals of the second microphone for the active speaker; and modify the attenuation based on an estimated location of the acoustic obstacle.
Abstract translation: 处理系统可以包括跟踪麦克风阵列，被配置为从来自阵列的音频信号和处理电路检测音频源的位置的音频跟踪电路。 处理电路可以被配置为：识别具有最强信号强度的第一麦克风; 至少基于音频跟踪电路的输出来估计有源扬声器的位置; 基于有源扬声器的位置和具有最强信号强度的第一麦克风的位置，确定主动扬声器的第二麦克风是否受到声学障碍物的影响; 基于麦克风的实际信号强度与基于用于主动扬声器的第二麦克风的麦克风信号估计的麦克风的估计信号强度进行比较来估计麦克风的衰减; 并且基于声学障碍物的估计位置来修改衰减。
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4.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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