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公开(公告)号：US20090316923A1
公开(公告)日：2009-12-24
申请号：US12141941
申请日：2008-06-19
申请人： Ivan Jelev Tashev , Alejandro Acero , Nilesh Madhu
发明人： Ivan Jelev Tashev , Alejandro Acero , Nilesh Madhu
摘要： A multichannel acoustic echo reduction system is described herein. The system includes an acoustic echo canceller (AEC) component having a fixed filter for each respective combination of loudspeaker and microphone signals and having an adaptive filter for each microphone signal. For each microphone signal, the AEC component modifies the microphone signal to reduce contributions from the outputs of the loudspeakers based at least in part on the respective adaptive filter associated with the microphone signal and the set of fixed filters associated with the respective microphone signal.
摘要翻译： 本文描述了多通道声学回声减少系统。 该系统包括声学回声消除器（AEC）组件，其具有用于扬声器和麦克风信号的每个相应组合的固定滤波器，并且具有用于每个麦克风信号的自适应滤波器。 对于每个麦克风信号，AEC组件至少部分地基于与麦克风信号相关联的相应自适应滤波器和与各个麦克风信号相关联的固定滤波器组来修改麦克风信号以减少来自扬声器的输出的贡献。
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公开(公告)号：US08385557B2
公开(公告)日：2013-02-26
申请号：US12141941
申请日：2008-06-19
申请人： Ivan Jelev Tashev , Alejandro Acero , Nilesh Madhu
发明人： Ivan Jelev Tashev , Alejandro Acero , Nilesh Madhu
IPC分类号： H04B3/20
摘要： A multichannel acoustic echo reduction system is described herein. The system includes an acoustic echo canceller (AEC) component having a fixed filter for each respective combination of loudspeaker and microphone signals and having an adaptive filter for each microphone signal. For each microphone signal, the AEC component modifies the microphone signal to reduce contributions from the outputs of the loudspeakers based at least in part on the respective adaptive filter associated with the microphone signal and the set of fixed filters associated with the respective microphone signal.
摘要翻译： 本文描述了多通道声学回声减少系统。 该系统包括声学回声消除器（AEC）组件，其具有用于扬声器和麦克风信号的每个相应组合的固定滤波器，并且具有用于每个麦克风信号的自适应滤波器。 对于每个麦克风信号，AEC组件至少部分地基于与麦克风信号相关联的相应自适应滤波器和与各个麦克风信号相关联的固定滤波器组来修改麦克风信号以减少来自扬声器的输出的贡献。
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公开(公告)号：US08325909B2
公开(公告)日：2012-12-04
申请号：US12145579
申请日：2008-06-25
申请人： Ivan J. Tashev , Alejandro Acero , Nilesh Madhu
发明人： Ivan J. Tashev , Alejandro Acero , Nilesh Madhu
CPC分类号： H04M9/082
摘要： Sound signals captured by a microphone are adjusted to provide improved sound quality. More particularly, an Acoustic Echo Reduction system which performs a first stage of echo reduction (e.g., acoustic echo cancellation) on a received signal is configured to perform a second stage of echo reduction (e.g., acoustic echo suppression) by segmenting the received signal into a plurality of frequency bins respectively comprised within a number of frames (e.g., 0.3 s to 0.5 s sound signal segments) for a given block. Data comprised within respective frequency bins is modeled according to a probability density function (e.g., Gaussian distribution). The probability of whether respective frequency bins comprise predominantly near-end signal or predominantly residual echo is calculated. The output of the acoustic echo suppression is computed as a product of the content of a frequency bin in a frame and the probability the frequency bin in a frame comprises predominantly near-end signal, thereby making near-end signals more prominent than residual echoes.
摘要翻译： 由麦克风捕获的声音信号进行调整，以提高音质。 更具体地，在接收信号上执行回波减少的第一阶段（例如，声学回声消除）的声学回波减少系统被配置为通过将接收到的信号分段为进行回波减少的第二阶段（例如，声学回声抑制） 分别包括在给定块的多个帧（例如，0.3s至0.5s的声音信号段）内的多个频率仓。 根据概率密度函数（例如，高斯分布）对包含在相应频率仓内的数据进行建模。 计算各个频率仓主要包括近端信号或主要是残余回波的概率。 声波回声抑制的输出被计算为帧中的频率仓的内容与帧中的频率仓主要包含近端信号的概率的乘积，从而使近端信号比残余回波更突出。
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公开(公告)号：US20090323924A1
公开(公告)日：2009-12-31
申请号：US12145579
申请日：2008-06-25
申请人： Ivan J. Tashev , Alejandro Acero , Nilesh Madhu
发明人： Ivan J. Tashev , Alejandro Acero , Nilesh Madhu
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Sound signals captured by a microphone are adjusted to provide improved sound quality. More particularly, an Acoustic Echo Reduction system which performs a first stage of echo reduction (e.g., acoustic echo cancellation) on a received signal is configured to perform a second stage of echo reduction (e.g., acoustic echo suppression) by segmenting the received signal into a plurality of frequency bins respectively comprised within a number of frames (e.g., 0.3 s to 0.5 s sound signal segments) for a given block. Data comprised within respective frequency bins is modeled according to a probability density function (e.g., Gaussian distribution). The probability of whether respective frequency bins comprise predominantly near-end signal or predominantly residual echo is calculated. The output of the acoustic echo suppression is computed as a product of the content of a frequency bin in a frame and the probability the frequency bin in a frame comprises predominantly near-end signal, thereby making near-end signals more prominent than residual echoes.
摘要翻译： 由麦克风捕获的声音信号进行调整，以提高音质。 更具体地，在接收信号上执行回波减少的第一阶段（例如，声学回声消除）的声学回波减少系统被配置为通过将接收到的信号分段为进行回波减少的第二阶段（例如，声学回声抑制） 分别包括在给定块的多个帧（例如，0.3s至0.5s的声音信号段）内的多个频率仓。 根据概率密度函数（例如，高斯分布）对包含在相应频率仓内的数据进行建模。 计算各个频率仓主要包括近端信号或主要是残余回波的概率。 声波回声抑制的输出被计算为帧中的频率仓的内容与帧中的频率仓主要包含近端信号的概率的乘积，从而使近端信号比残余回波更突出。
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