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1. 发明授权

US5740256A Adaptive noise cancelling arrangement, a noise reduction system and a transceiver 失效
标题翻译：自适应噪声消除装置，降噪系统和收发器
公开(公告)号：US5740256A
公开(公告)日：1998-04-14
申请号：US762682
申请日：1996-12-11
申请人： Paulo M. Castello Da Costa , Cornelis P. Janse , Patrick A. A. Timmermans
发明人： Paulo M. Castello Da Costa , Cornelis P. Janse , Patrick A. A. Timmermans
IPC分类号： G10K11/178 , H04B7/015 , H04B15/00 , H04R3/00 , H04R29/00
CPC分类号： H04B7/015 , H04R3/005 , H04R2430/20 , H04R29/005
摘要： A known cross-coupled adaptive noise cancelling arrangement uses an adaptive noise filter and an adaptive cross-talk filter in a feedback loop for cancelling correlated noise at a primary signal input and reference input. This known cross-coupled ANC does not operate satisfactorily, particularly not for acoustic noise cancellation. This leads to reverberant-like sound signals, in particular in a typical office room with remote noise sources. A different configuration of a cross-coupled adaptive noise cancelling arrangement gives rise to a better performance. The adaptive cross-talk filter is now split into a pre-filter section and an adaptive filter section, the sections using different input signals. The pre-filter section estimates the desired signal from the input signal of the noise cancelling arrangement, and the adaptive filter section has its input coupled to the output of the noise cancelling arrangement, a delay section being provided between the input and the output of the noise cancelling arrangement. In an embodiment, the pre-filter section and the adaptive filter section are separate filters.
摘要翻译：已知的交叉耦合自适应噪声消除装置在反馈环路中使用自适应噪声滤波器和自适应串扰滤波器来消除主信号输入和参考输入处的相关噪声。这种已知的交叉耦合ANC不能令人满意地运行，特别是不用于声学噪声消除。这导致类似混响的声音信号，特别是在具有远程噪声源的典型办公室中。交叉耦合自适应噪声消除装置的不同配置产生更好的性能。自适应串扰滤波器现在分为预滤波器部分和自适应滤波器部分，这些部分使用不同的输入信号。预滤波器部分从噪声消除装置的输入信号估计期望的信号，并且自适应滤波器部分的输入耦合到噪声消除装置的输出，延迟部分设置在输入和输出之间降噪布置。在一个实施例中，预滤波器部分和自适应滤波器部分是分离的滤波器。

2. 发明授权

US5748751A Signal amplifier system with improved echo cancellation 失效
标题翻译：具有改善回声消除功能的信号放大器系统
公开(公告)号：US5748751A
公开(公告)日：1998-05-05
申请号：US822958
申请日：1997-03-21
申请人： Cornelis P. Janse , Patrick A. A. Timmermans
发明人： Cornelis P. Janse , Patrick A. A. Timmermans
IPC分类号： H04R3/02 , H03G3/00 , H04R25/00 , H04B15/00
CPC分类号： H04R25/453 , H04R25/502
摘要： In a signal amplifier system, a microphone (2) is connected to an echo canceller (16) via a decorrelator (6). The output signal of the echo canceller (16) is amplified by an amplifier (14) and fed to a loudspeaker (18). The echo canceller (16) is included to avoid instability caused by undesired feedback of the signal coming from the loudspeaker (18) through a feedback path (11). To improve the stabilizing effect of the echo canceller (16), the decorrelator (6) is included for decorrelating the signal coming from the microphone (2) and the signal transmitted by the loudspeaker (18).
摘要翻译：在信号放大器系统中，麦克风（2）经由去相关器（6）连接到回声消除器（16）。回波消除器（16）的输出信号由放大器（14）放大并馈送到扬声器（18）。回波消除器（16）被包括以避免由来自扬声器（18）的信号的不希望的反馈通过反馈路径（11）引起的不稳定性。为了改善回声消除器（16）的稳定效果，包括去相关器（6）用于对来自麦克风（2）的信号和由扬声器（18）传输的信号进行解相关。

3. 发明授权

US5768398A Signal amplification system with automatic equalizer 失效
标题翻译：信号放大系统带自动均衡器
公开(公告)号：US5768398A
公开(公告)日：1998-06-16
申请号：US626531
申请日：1996-04-02
申请人： Cornelis P. Janse , Patrick A. A. Timmermans
发明人： Cornelis P. Janse , Patrick A. A. Timmermans
IPC分类号： H04R3/04 , H03G5/16 , H03G5/22 , H03H21/00 , H04R1/00 , H03G5/00
CPC分类号： H03G5/22 , H04R3/04
摘要： A signal amplification system wherein a signal coming from a microphone is applied to a loudspeaker via a signal processing system. The signal processing system includes an estimator for estimating the transfer function from the loudspeaker to the microphone. The equalizer is set to a transfer function that is reciprocal to the transfer function from the loudspeaker to the microphone to equalize the transfer function from the microphone to the listeners. The estimator may include an adaptive filter which has a transfer function that approaches the transfer function from the loudspeaker to the microphone.
摘要翻译：一种信号放大系统，其中来自麦克风的信号经由信号处理系统施加到扬声器。信号处理系统包括用于估计从扬声器到麦克风的传递函数的估计器。均衡器被设置为与从扬声器到麦克风的传递函数相互转换的传递函数，以平衡从麦克风到听众的传递函数。估计器可以包括具有接近从扬声器到麦克风的传递函数的传递函数的自适应滤波器。

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