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1. 发明申请

WO2011137258A1 MULTI-MICROPHONE ROBUST NOISE SUPPRESSION 审中-公开
标题翻译：多麦克风强力噪声抑制
公开(公告)号：WO2011137258A1
公开(公告)日：2011-11-03
申请号：PCT/US2011/034373
申请日：2011-04-28
申请人： AUDIENCE, INC. , EVERY, Mark , AVENDANO, Carlos , SOLBACH, Ludger , JIANG, Ye , MURGIA, Carlo
发明人： EVERY, Mark , AVENDANO, Carlos , SOLBACH, Ludger , JIANG, Ye , MURGIA, Carlo
IPC分类号： G10L21/02
CPC分类号： H04R3/002 , G10L21/0208 , G10L21/0232 , G10L2021/02082 , G10L2021/02166
摘要： A robust noise reduction system may concurrently reduce noise and echo components in an acoustic signal while limiting the level of speech distortion. The system may receive acoustic signals from two or more microphones in a close-talk, hand-held or other configuration. The received acoustic signals are transformed to cochlea domain sub-band signals and echo and noise components may be subtracted from the sub-band signals. Features in the acoustic sub-band signals are identified and used to generate a multiplicative mask. The multiplicative mask is applied to the noise subtracted sub-band signals and the sub-band signals are reconstructed in the time domain.
摘要翻译：鲁棒的降噪系统可以同时降低声信号中的噪声和回波分量，同时限制语音失真的水平。系统可以以紧密通话，手持式或其他配置从两个或更多个麦克风接收声信号。接收到的声信号被变换为耳蜗域子带信号，并且可以从子带信号中减去回波和噪声分量。识别声学子带信号中的特征并用于产生乘法掩模。将乘法掩码应用于噪声减去的子带信号，并且在时域中重构子带信号。

2. 发明申请

WO2011094232A1 ADAPTIVE NOISE REDUCTION USING LEVEL CUES 审中-公开
标题翻译：自适应噪音减少使用水平
公开(公告)号：WO2011094232A1
公开(公告)日：2011-08-04
申请号：PCT/US2011/022462
申请日：2011-01-25
申请人： AUDIENCE, INC. , MURGIA, Carlo , AVENDANO, Carlos , YOUNES, Karim , EVERY, Mark , JIANG, Ye
发明人： MURGIA, Carlo , AVENDANO, Carlos , YOUNES, Karim , EVERY, Mark , JIANG, Ye
IPC分类号： A61F11/06
CPC分类号： G10K11/16 , H04R3/005
摘要： An array of microphones utilizes two sets of two microphones for noise suppression. A primary microphone and secondary microphone of the three microphones may be positioned closely spaced to each other to provide acoustic signals used to achieve noise cancellation. A tertiary microphone may be spaced with respect to either the primary microphone or the secondary microphone in a spread-microphone configuration for deriving level cues from audio signals provided by tertiary and the primary or secondary microphone. The level cues are expressed via an inter-microphone level difference (ILD) which is used to determine one or more cluster tracking control signals. The ILD based cluster tracking signals are used to control the adaptation of null-processing noise cancellation modules. A noise cancelled primary acoustic signal and ILD based cluster tracking control signals are used during post filtering to adaptively generate a mask to be applied against a speech estimate signal.
摘要翻译：一组麦克风使用两组麦克风进行噪声抑制。三个麦克风的主麦克风和次麦克风可以彼此紧密地定位，以提供用于实现噪声消除的声信号。第三麦克风可以在扩展麦克风配置中相对于主麦克风或辅助麦克风间隔开，以从由三级麦克风和主麦克风或辅助麦克风提供的音频信号导出电平提示。通过用于确定一个或多个集群跟踪控制信号的麦克风间级差（ILD）来表示电平提示。基于ILD的群集跟踪信号用于控制空处理噪声消除模块的适应。在后滤波期间使用噪声消除的主声信号和基于ILD的群集跟踪控制信号来自适应地生成针对语音估计信号应用的掩码。

3. 发明申请

WO2011133405A1 METHOD FOR JOINTLY OPTIMIZING NOISE REDUCTION AND VOICE QUALITY IN A MONO OR MULTI-MICROPHONE SYSTEM 审中-公开
标题翻译：在单声道或多麦克风系统中优化噪声降低和语音质量的方法
公开(公告)号：WO2011133405A1
公开(公告)日：2011-10-27
申请号：PCT/US2011/032578
申请日：2011-04-14
申请人： AUDIENCE, INC. , EVERY, Mark , AVENDANO, Carlos
发明人： EVERY, Mark , AVENDANO, Carlos
IPC分类号： H04B15/00
CPC分类号： G10L21/0232 , G10L21/0208 , G10L25/18 , G10L2021/02087 , H04R3/002
摘要： The present technology provides adaptive noise reduction of an acoustic signal using a sophisticated level of control to balance the tradeoff between speech loss distortion and noise reduction. The energy level of a noise component in a sub-band signal of the acoustic signal is reduced based on an estimated signal-to-noise ratio of the sub-band signal, and further on an estimated threshold level of speech distortion in the sub-band signal. In embodiments, the energy level of the noise component in the sub-band signal may be reduced to no less than a residual noise target level. Such a target level may be defined as a level at which the noise component ceases to be perceptible.
摘要翻译：本技术使用复杂的控制水平来提供声信号的自适应降噪，以平衡语音丢失失真和噪声降低之间的权衡。基于子带信号的估计信噪比减小声信号的子带信号中的噪声分量的能级，并且还基于子带信号的估计的语音失真阈值水平，频带信号。在实施例中，子带信号中的噪声分量的能级可以减小到不小于残余噪声目标电平。这样的目标水平可以被定义为噪声分量不再可察觉的水平。

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