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    Noise burst adaptation of secondary path adaptive response in noise-canceling personal audio devices
    2.
    发明授权
    Noise burst adaptation of secondary path adaptive response in noise-canceling personal audio devices 有权
    噪声消除个人音频设备中的二次路径自适应响应的噪声突发适配

    公开(公告)号：US09082387B2

    公开(公告)日：2015-07-14

    申请号：US13722119

    申请日：2012-12-20

    申请人： Cirrus Logic, Inc.

    发明人： Jon D. Hendrix ,  Jeffrey Alderson ,  Antonio John Miller ,  Yang Lu

    IPC分类号： G10K11/16 ,  G10K11/00 ,  G10K11/178

    CPC分类号： G10K11/002 ,  G10K11/178 ,  G10K11/17817 ,  G10K2210/108 ,  G10K2210/3049

    摘要： A personal audio device, such as a wireless telephone, generates an anti-noise signal from an error microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. The error microphone is also provided proximate the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Noise bursts are injected intermittently and the adaptation of the secondary path estimating adaptive filter controlled, so that the secondary path estimate can be maintained irrespective of the presence and amplitude of the source audio.

    摘要翻译： 诸如无线电话的个人音频设备从误差麦克风信号产生抗噪声信号，并将抗噪声信号注入到扬声器或其它换能器输出中以引起环境声音的消除。 误差麦克风也靠近扬声器提供，以提供指示噪声消除的有效性的误差信号。 二次路径估计自适应滤波器用于估计通过换能器的噪声消除电路的电声路径，从而可以从误差信号中去除源音频。 噪声突发被间歇地注入，并且二次路径估计自适应滤波器的适配被控制，使得可以维持辅助路径估计，而不管源音频的存在和幅度如何。

    NETWORKED SOUND MASKING SYSTEM
    3.
    发明申请
    NETWORKED SOUND MASKING SYSTEM 审中-公开
    网络声音屏蔽系统

    公开(公告)号：US20130243215A1

    公开(公告)日：2013-09-19

    申请号：US13890824

    申请日：2013-05-09

    申请人： Klaus Moeller ,  Niklas Moeller ,  Mircea Rusu ,  Carl Derla

    发明人： Klaus Moeller ,  Niklas Moeller ,  Mircea Rusu ,  Carl Derla

    IPC分类号： H04R3/00

    CPC分类号： G10K11/175 ,  G10K2210/3014 ,  G10K2210/30351 ,  G10K2210/3049 ,  H04K3/42 ,  H04K3/43 ,  H04K3/45 ,  H04K3/825 ,  H04K2203/12 ,  H04K2203/34 ,  H04M11/027 ,  H04R3/002 ,  H04R27/00 ,  H05K5/0247

    摘要： A sound masking system for shaping the ambient noise level in a physical environment. The sound masking system comprises a networked and distributed system having a number of master units coupled together and to a control unit. One or more of the master units may include satellite sound masking units which function to reproduce the sound masking signal generated by the master sound masking unit. Each of the master units is addressable over the network by the control unit enabling the control unit to program the contour, spectral band, and gain characteristics of the sound masking output signal. The system may also include a remote control unit which provides the capability to tune and adjust each master sound masking unit in situ without requiring physical access through the ceiling installation.

    摘要翻译： 用于在物理环境中整形环境噪声水平的声音遮蔽系统。 声音掩蔽系统包括具有耦合在一起的多个主单元和控制单元的网络和分布式系统。 一个或多个主单元可以包括用于再现由主声音屏蔽单元生成的声屏蔽信号的卫星声音屏蔽单元。 每个主单元可由控制单元通过网络寻址，使得控制单元能够编程声屏蔽输出信号的轮廓，频谱带和增益特性。 该系统还可以包括遥控单元，该遥控单元提供能够在现场调整和调整每个主声音屏蔽单元的能力，而不需要通过天花板安装进行物理访问。

    Adaptive digital noise canceller
    4.
    发明授权
    Adaptive digital noise canceller 有权
    自适应数字噪声消除器

    公开(公告)号：US08385559B2

    公开(公告)日：2013-02-26

    申请号：US12649770

    申请日：2009-12-30

    申请人： Lalin Theverapperuma ,  Talal Aly Youssef

    发明人： Lalin Theverapperuma ,  Talal Aly Youssef

    IPC分类号： G10K11/16

    CPC分类号： G10K11/17817 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1053 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/30232 ,  G10K2210/3049 ,  H04R1/1083

    摘要： Systems and methods for adaptive feed-forward noise cancellation. The system includes a plurality of reference microphones, an error microphone, a secondary path module, an adaptation controller, and a canceller filter. A finite impulse response (“FIR”) based plant model is converted to an infinite impulse response (“IIR”) based plant model using balanced model reduction. Due to the inherent instability of the adaptive IIR filter, the Schur-Cohn stability test is applied to the denominator coefficients of the IIR filter transfer function to determine the stability of the noise cancellation system. A secondary path of the noise cancellation system is identified in an on-line manner in the secondary path module. If the energy level of the communication signal (e.g., a music signal) is strong, secondary path identification is performed. The adaptation controller controls the updating of the IIR transfer function based on the stability determination and the secondary path. An anti-noise signal is then generated and added to the communication signal. The anti-noise signal is generated within approximately 60 or fewer micro-seconds.

    摘要翻译： 用于自适应前馈噪声消除的系统和方法。 该系统包括多个参考麦克风，误差麦克风，次要路径模块，自适应控制器和消除器滤波器。 基于有限脉冲响应（FIR）的植物模型使用平衡模型降低转换为基于无限脉冲响应（IIR）的植物模型。 由于自适应IIR滤波器的固有不稳定性，Schur-Cohn稳定性测试被应用于IIR滤波器传递函数的分母系数，以确定噪声消除系统的稳定性。 在次要路径模块中以在线方式识别噪声消除系统的辅助路径。 如果通信信号（例如，音乐信号）的能级很强，则执行次要路径识别。 适应控制器基于稳定性确定和辅助路径来控制IIR传递函数的更新。 然后产生抗噪声信号并将其加到通信信号中。 抗噪声信号在大约60个或更少的微秒内产生。

    ADAPTIVE DIGITAL NOISE CANCELLER
    5.
    发明申请
    ADAPTIVE DIGITAL NOISE CANCELLER 有权
    自适应数字噪音消除器

    公开(公告)号：US20110158419A1

    公开(公告)日：2011-06-30

    申请号：US12649770

    申请日：2009-12-30

    申请人： Lalin Theverapperuma ,  Talal Aly Youssef

    发明人： Lalin Theverapperuma ,  Talal Aly Youssef

    IPC分类号： G10K11/16

    CPC分类号： G10K11/17817 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1053 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/30232 ,  G10K2210/3049 ,  H04R1/1083

    摘要： Systems and methods for adaptive feed-forward noise cancellation. The system includes a plurality of reference microphones, an error microphone, a secondary path module, an adaptation controller, and a canceller filter. A finite impulse response (“FIR”) based plant model is converted to an infinite impulse response (“IIR”) based plant model using balanced model reduction. Due to the inherent instability of the adaptive IIR filter, the Schur-Cohn stability test is applied to the denominator coefficients of the IIR filter transfer function to determine the stability of the noise cancellation system. A secondary path of the noise cancellation system is identified in an on-line manner in the secondary path module. If the energy level of the communication signal (e.g., a music signal) is strong, secondary path identification is performed. The adaptation controller controls the updating of the IIR transfer function based on the stability determination and the secondary path. An anti-noise signal is then generated and added to the communication signal. The anti-noise signal is generated within approximately 60 or fewer micro-seconds.

    摘要翻译： 用于自适应前馈噪声消除的系统和方法。 该系统包括多个参考麦克风，误差麦克风，次要路径模块，自适应控制器和消除器滤波器。 基于有限脉冲响应（“FIR”）的植物模型使用平衡模型降低转换为基于无限脉冲响应（“IIR”）的植物模型。 由于自适应IIR滤波器的固有不稳定性，Schur-Cohn稳定性测试被应用于IIR滤波器传递函数的分母系数，以确定噪声消除系统的稳定性。 在次要路径模块中以在线方式识别噪声消除系统的辅助路径。 如果通信信号（例如，音乐信号）的能级很强，则执行次要路径识别。 适应控制器基于稳定性确定和辅助路径来控制IIR传递函数的更新。 然后产生抗噪声信号并将其加到通信信号中。 抗噪声信号在大约60个或更少的微秒内产生。

    Frequency selective active adaptive control system
    6.
    发明授权
    Frequency selective active adaptive control system 失效
    频率选择主动自适应控制系统

    公开(公告)号：US5710822A

    公开(公告)日：1998-01-20

    申请号：US553186

    申请日：1995-11-07

    申请人： Shawn K. Steenhagen ,  Steve C. Southward ,  Kent F. Delfosse

    发明人： Shawn K. Steenhagen ,  Steve C. Southward ,  Kent F. Delfosse

    IPC分类号： G10K11/178 ,  G10K11/16

    CPC分类号： G10K11/1784 ,  G10K2210/117 ,  G10K2210/3028 ,  G10K2210/3039 ,  G10K2210/3049

    摘要： An active adaptive control system and method has frequency dependent filtering with a transfer characteristic which is a function of a frequency dependent shaped power limitation characteristic maximizing usage of available output transducer authority. Band separation is provided for different tones. Power limit partitioning is provided for effectively distributing power between correction tones to maximize model performance.

    摘要翻译： 主动自适应控制系统和方法具有频率相关滤波，其具有传递特性，其是频率依赖的形状功率限制特性的函数，其最大化可用输出传感器权威的使用。 为不同的音调提供频带分离。 提供功率限制分区，用于在校正音之间有效分配功率，以最大限度地提高模型性能。

    Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation
    7.
    再颁专利
    Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation 失效
    利用伪噪声信号进行回声消除的通信装置及方法

    公开(公告)号：USRE35574E

    公开(公告)日：1997-07-29

    申请号：US447686

    申请日：1995-05-23

    申请人： Steve F. Russell ,  John F. Doherty

    发明人： Steve F. Russell ,  John F. Doherty

    IPC分类号： G10K11/178 ,  H04M9/08 ,  H04K1/02 ,  G10K11/16 ,  H04L27/30

    CPC分类号： G10K11/178 ,  H04M9/082 ,  G10K2210/108 ,  G10K2210/3018 ,  G10K2210/30232 ,  G10K2210/3049 ,  G10K2210/505 ,  G10K2210/512

    摘要： A communication device, an apparatus, and a method for acoustic echo cancellation which makes use of a pseudonoise signal. An audio mixer adds the pseudonoise signal to an input signal received from another communication device to produce a first composite signal. An audio system converts the first composite signal to sound in an at least partially enclosed space. The at least partially enclosed space produces an acoustical echo in response. The audio system then converts the acoustical echo and other sounds in the at least partially enclosed space to a second composite signal. A signal processor cross-correlates the second composite signal with the pseudonoise signal to produce an estimate of the overall impulse response of the combined system formed by the at least partially enclosed space and the audio system. The processor then convolves the first composite signal with the impulse response estimate to produce an echo estimation signal. The echo estimation signal is an estimate of the component of the second composite signal which corresponds to the acoustical echo. The processor then subtracts the echo estimation signal from the second composite signal to produce an output signal.

    摘要翻译： 一种使用伪噪声信号的通信设备，装置和用于声学回声消除的方法。 音频混合器将伪噪声信号添加到从另一通信设备接收的输入信号以产生第一复合信号。 音频系统将第一复合信号转换成至少部分封闭的空间中的声音。 至少部分封闭的空间产生响应的声学回波。 然后，音频系统将至少部分封闭空间中的声学回声和其他声音转换为第二复合信号。 信号处理器将第二复合信号与伪噪声信号相互相关，以产生由至少部分封闭的空间和音频系统形成的组合系统的总脉冲响应的估计。 然后处理器将第一复合信号与脉冲响应估计进行卷积，以产生回波估计信号。 回波估计信号是对应于声学回波的第二复合信号的分量的估计。 然后，处理器从第二复合信号中减去回波估计信号以产生输出信号。

    Method and apparatus of determining the sound transfer characteristic of an active noise control system
    8.
    发明授权
    Method and apparatus of determining the sound transfer characteristic of an active noise control system 失效
    确定主动噪声控制系统的声音传递特性的方法和装置

    公开(公告)号：US5602926A

    公开(公告)日：1997-02-11

    申请号：US115872

    申请日：1993-09-03

    申请人： Tadashi Ohashi ,  Kensaku Fujii ,  Juro Ohga

    发明人： Tadashi Ohashi ,  Kensaku Fujii ,  Juro Ohga

    IPC分类号： F01N1/00 ,  F01N1/06 ,  G10K11/16 ,  G10K11/178 ,  H03H17/00 ,  H03H17/02 ,  H03H21/00 ,  H04B3/04

    CPC分类号： G10K11/1784 ,  G10K2210/3018 ,  G10K2210/30232 ,  G10K2210/3045 ,  G10K2210/3049 ,  G10K2210/506

    摘要： A method and apparatus of determining the transfer characteristic in an active-noise-control system, which involves generating white noise at an end of a one-dimensional sound field that is defined by a linear ventilating system in which sound travels essentially parallel to the extended direction of the system; equalizing the transfer characteristic of the one-dimensional sound field and generating cancelling sound, according to an inverse of the transfer characteristic, to cancel the white noise and prevent noise being output from the other end of the one-dimensional sound field; continuously preventing the noise output and measuring the characteristic data of the one-dimensional sound field at, at least, one measuring point in the one-dimensional sound field; and calculating the transfer function of the one-dimensional sound field in the noise-output-prevented state, according to the characteristic data of the sound field.

    摘要翻译： 一种确定有源噪声控制系统中的传输特性的方法和装置，其涉及在由线性通风系统限定的一维声场的末端产生白噪声，其中声音基本上平行于延伸的 系统方向; 根据传输特性的相反均衡一维声场的传递特性并产生消除声音，以消除白噪声并防止噪声从一维声场的另一端输出; 连续地防止噪声输出并测量一维声场中至少一个测量点的一维声场的特征数据; 以及根据声场的特征数据计算噪声输出防止状态下的一维声场的传递函数。

    Electronic noise attenuation system
    9.
    发明授权
    Electronic noise attenuation system 失效
    电子噪声衰减系统

    公开(公告)号：US5018202A

    公开(公告)日：1991-05-21

    申请号：US313475

    申请日：1989-02-22

    申请人： Minoru Takahashi ,  Tanetoshi Miura ,  Hareo Hamada ,  Hideki Hyoudo ,  Ryusuke Gotoda ,  Yasushi Yoshimura ,  Takashi Kuribayashi ,  Akio Akasaka

    发明人： Minoru Takahashi ,  Tanetoshi Miura ,  Hareo Hamada ,  Hideki Hyoudo ,  Ryusuke Gotoda ,  Yasushi Yoshimura ,  Takashi Kuribayashi ,  Akio Akasaka

    IPC分类号： H04R3/00 ,  G10K11/178

    CPC分类号： G10K11/1784 ,  G10K2210/3045 ,  G10K2210/3049 ,  G10K2210/508

    摘要： An electronic noise attenuation system for attenuating a sound wave propagated from a source of noise by generating another sound wave 180.degree. out of phase and having the same sound pressure with the propagated sound wave from electro-mechanic transducer means disposed in a propagation passage of sound waves. In the electronic noise attenuation system, a drive signal for drive the electro-mechanic transducer means is generated in accordance with output signals respectively output from upstream-side and downstream-side mechano-electric transducer means respectively disposed in the propagation passage with the electro-mechanic transducer means therebetween. Namely, the drive signal is created by performing an operation on a difference signal between the output signal of the upstream mechano-electric transducer means and the drive signal according to a given transfer function. Also, the transfer function is determined in accordance with the difference signal and the output signal of the downstream mechano-electric transducer means.

    摘要翻译： 一种电子噪声衰减系统，用于衰减从噪声源传播的声波，通过产生与声波传播通道中设置的来自机电传感器装置的传播声波相同并且具有相同声压180°的另一声波 波浪。 在电子噪声衰减系统中，根据从分别设置在传播路径中的上游侧和下游侧机械电传感器装置输出的输出信号，产生用于驱动机电换能器装置的驱动信号， 机械传感器装置在其间。 即，通过根据给定的传递函数对上游机电换能器装置的输出信号和驱动信号之间的差分信号执行操作来创建驱动信号。 而且，传递函数根据差分信号和下游机电换能器装置的输出信号来确定。