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    Coefficient updating method for an adaptive filter
    81.
    发明授权
    Coefficient updating method for an adaptive filter 失效
    自适应滤波器的系数更新方法

    公开(公告)号：US5668747A

    公开(公告)日：1997-09-16

    申请号：US377726

    申请日：1995-01-25

    申请人： Tadashi Ohashi

    发明人： Tadashi Ohashi

    IPC分类号： G10K11/178 ,  G06F17/10

    CPC分类号： G06F17/10 ,  G10K11/1784 ,  G10K2210/3016 ,  G10K2210/3053 ,  G10K2210/503

    摘要： A coefficient updating method stops updating filter coefficients for a plurality of adaptive filters when a convergence condition is achieved. Active noise control within a system simulates an original noise signal with a simulated noise signal which is equal and opposite to the original noise signal. To detect feedback in such a system, a reference signal or "white noise" is generated by a speaker, transmitted through the system and received by a microphone. Coefficients of multiple filters such as an anti-feedback filter, a C filter, and a noise control filter are then updated to minimize adverse parameters such as original noise and feedback. Coefficient updating of the adaptive filters is stopped when a minimum average value is reached.

    摘要翻译： 当实现收敛条件时，系数更新方法停止更新多个自适应滤波器的滤波器系数。 系统内的主动噪声控制利用与原始噪声信号相等和相反的模拟噪声信号来模拟原始噪声信号。 为了检测这种系统中的反馈，通过扬声器产生参考信号或“白噪声”，通过系统发送并由麦克风接收。 然后更新诸如反馈滤波器，C滤波器和噪声控制滤波器的多个滤波器的系数以最小化诸如原始噪声和反馈的不利参数。 当达到最小平均值时，停止自适应滤波器的系数更新。

    Filter coefficient estimation apparatus
    82.
    发明授权
    Filter coefficient estimation apparatus 失效
    滤波系数估计装置

    公开(公告)号：US5638311A

    公开(公告)日：1997-06-10

    申请号：US538446

    申请日：1995-10-03

    申请人： Kensaku Fujii ,  Juro Ohga

    发明人： Kensaku Fujii ,  Juro Ohga

    IPC分类号： G10K11/178 ,  H03H21/00 ,  H04B1/10 ,  H04B3/23 ,  H04M1/60 ,  H04M9/08 ,  G06F17/10

    CPC分类号： G10K11/1784 ,  H03H21/0012 ,  H04M9/082 ,  G10K2210/108 ,  G10K2210/3012 ,  G10K2210/30232 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3053 ,  G10K2210/503 ,  G10K2210/504 ,  G10K2210/505 ,  H03H2021/007 ,  H03H2021/0074 ,  H03H2021/0089

    摘要： An estimation apparatus predicts filter coefficients for an adaptive filter, the response of which emulates the signal transmission characteristics of a known signal. The response thereto is sent to a signal transmission system of unknown characteristics, enabling execution of calculations without invalidating coefficient updating, even when there is a limit on the word length for processings. To achieve this, a sum of products calculation unit calculates the sum of products of the residual difference in response and the signal which is sent to the signal transmission system. A sum of squares calculating unit calculates the sum of the squares of the signal sent to the signal transmission system over a prescribed period of time. An updating amount calculation unit calculates the filter coefficient updating amounts from the ratio of the results from the sum of the products calculating unit to the results of the sum of the squares calculating unit. Filter coefficients are updated using the coefficient updating amounts calculated by the updating amount calculation unit.

    摘要翻译： 估计装置预测自适应滤波器的滤波器系数，其自适应滤波器的响应模拟已知信号的信号传输特性。 其响应被发送到具有未知特性的信号传输系统，使得能够执行计算而不使系数更新无效，即使对于处理的字长限制也是如此。 为了实现这一点，产品计算单元的总和计算出响应中的残差差和发送到信号传输系统的信号的乘积之和。 平方和计算单元计算在规定时间内发送到信号传输系统的信号的平方和。 更新量计算单元根据从乘积计算单元的总和到平方计算单元的总和的结果的比率来计算滤波器系数更新量。 使用由更新量计算单元计算的系数更新量来更新滤波器系数。

    Noise controller
    84.
    发明授权
    Noise controller 失效
    噪音控制器

    公开(公告)号：US5499302A

    公开(公告)日：1996-03-12

    申请号：US455138

    申请日：1995-05-31

    申请人： Masaaki Nagami ,  Kazuya Sako ,  Masahiro Babasaki ,  Kazuhiro Sakiyama

    发明人： Masaaki Nagami ,  Kazuya Sako ,  Masahiro Babasaki ,  Kazuhiro Sakiyama

    IPC分类号： G10K11/178 ,  G10K11/16

    CPC分类号： G10K11/1784 ,  G10K2210/30232 ,  G10K2210/3033 ,  G10K2210/3045 ,  G10K2210/3049 ,  G10K2210/3052 ,  G10K2210/503

    摘要： In a noise controller which forms a noise cancelling sound having a phase opposite to and a sound pressure equal to those of a noise infiltrating into a closed space, any deviation in its transfer characteristics from the initial equalization is easily checked and judged owing to the provision of an adaptive filter which automatically varies the filter coefficient and forms a cancelling signal for forming a cancelling sound, a coefficient updating means which updates the filter coefficient based on an error signal after the noise has been cancelled, a simulated transfer characteristics compensation means which forms the initial equalization by simulating transfer characteristics of a transmission path via the space in which the noise is to be cancelled and forms a reproduced reference signal, a white noise generating means which generates white noise to check the initial equalization, and an initial equalization judging means which judges the accuracy of the initial equalization based on a ratio (S/N) of the reproduced reference signal obtained from white noise to the error signal. A change in the conditions for cancelling noise is detected in the closed space, and any deviation from the initial equalization is judged.

    摘要翻译： 在形成噪声消除声音的噪声控制器中，其噪声消除声音具有相当于与渗透到封闭空间中的噪声的相位相同的声压，因此容易检查其传输特性与初始均衡的偏差，并由于提供 自适应滤波器，其自动地改变滤波器系数并形成用于形成消除声音的抵消信号;系数更新装置，其基于噪声已被消除之后的误差信号来更新滤波器系数;模拟传送特性补偿装置，其形成 通过模拟通过要消除噪声的空间的传输路径的传输特性并形成再现的参考信号的初始均衡;产生白噪声以检查初始均衡的白噪声产生装置，以及初始均衡判定装置 其判断基于初始均衡的准确性 根据从白噪声获得的再现参考信号与误差信号的比（S / N）。 在封闭空间中检测到消除噪声的条件的改变，并且判断与初始均衡的任何偏差。

    Non-integer sample delay active noise canceller
    85.
    发明授权
    Non-integer sample delay active noise canceller 失效
    非整数采样延迟有源噪声消除器

    公开(公告)号：US5388080A

    公开(公告)日：1995-02-07

    申请号：US53738

    申请日：1993-04-27

    申请人： Paul L. Feintuch ,  Allen K. Lo

    发明人： Paul L. Feintuch ,  Allen K. Lo

    IPC分类号： G10K11/178 ,  H03H21/00 ,  H04B3/04 ,  H04B15/00

    CPC分类号： G10K11/178 ,  G10K2210/3025 ,  G10K2210/3032 ,  G10K2210/3045 ,  G10K2210/3051 ,  G10K2210/503 ,  Y10S367/901

    摘要： An active adaptive noise canceller that inserts delays into the weight update logic of an adaptive filter to keep the filter stable. The noise and residual noise are sensed and the respective sensor signals are digitized at a given sample rate for processing in the adaptive filter. To eliminate the need for high sample rates while maintaining flexibility in the frequency regions over which the adaptive filter is stable, the delay introduced into the weight update logic is a non-integer multiple of the sample period. The non-integer sample delay is obtained by a sample interpolation and decimation procedure.

    摘要翻译： 一种主动自适应噪声消除器，其将延迟插入到自适应滤波器的权重更新逻辑中以保持滤波器稳定。 检测噪声和残留噪声，并以给定的采样率对相应的传感器信号进行数字化处理，以在自适应滤波器中进行处理。 为了消除对采样率高的需要，同时保持自适应滤波器稳定的频率区域的灵活性，引入加权更新逻辑的延迟是采样周期的非整数倍。 通过样本内插和抽取程序获得非整数采样延迟。

    Apparatus for actively reducing noise for interior of enclosed space
    87.
    发明授权
    Apparatus for actively reducing noise for interior of enclosed space 失效
    用于积极减少封闭空间内部噪声的装置

    公开(公告)号：US5337365A

    公开(公告)日：1994-08-09

    申请号：US935100

    申请日：1992-08-27

    申请人： Tsutomu Hamabe ,  Akio Kinoshita ,  Kazuhiro Doi ,  Kenichiro Muraoka ,  Noriharu Sato

    发明人： Tsutomu Hamabe ,  Akio Kinoshita ,  Kazuhiro Doi ,  Kenichiro Muraoka ,  Noriharu Sato

    IPC分类号： B64C1/40 ,  G10K11/178 ,  A61F11/06

    CPC分类号： G10K11/1786 ,  G10K2210/121 ,  G10K2210/1282 ,  G10K2210/3046 ,  G10K2210/3221 ,  G10K2210/502 ,  G10K2210/503

    摘要： An apparatus for reducing noise for an interior of enclosed space, e.g., a vehicular compartment using an FIR adaptive digital filter is disclosed in which a control circuit is provided which outputs drive signals to a plurality of loud speakers which generate control sounds to interfer with a noise sound propagated in the interior so that a performance function including terms of residual noise signals output from residual noise signal detecting microphones and drive signals to the loud speakers is minimized and contributivity of the drive signals to the performance function is changed according to an occurrence of divergence in the noise reducing apparatus.

    摘要翻译： 公开了一种用于减少封闭空间内部的噪声的设备，例如使用FIR自适应数字滤波器的车厢，其中提供了一种控制电路，其向多个扬声器输出驱动信号，该扬声器产生控制声音以干扰 噪声在内部传播，使得包括从剩余噪声信号检测麦克风输出的残留噪声信号的项目和对扬声器的驱动信号的性能函数最小化，并且驱动信号对性能函数的贡献度根据 降噪装置发散。

    Multi-channel adaptive canceler
    88.
    发明授权
    Multi-channel adaptive canceler 失效
    多通道自适应消除器

    公开(公告)号：US5309378A

    公开(公告)日：1994-05-03

    申请号：US039713

    申请日：1993-03-30

    申请人： Robert T. Beierle

    发明人： Robert T. Beierle

    IPC分类号： G01M13/02 ,  G06F17/00 ,  G10K11/178 ,  G06F15/20

    CPC分类号： G10K11/1784 ,  G01M13/028 ,  G10K2210/108 ,  G10K2210/3025 ,  G10K2210/3031 ,  G10K2210/3042 ,  G10K2210/3045 ,  G10K2210/3053 ,  G10K2210/3214 ,  G10K2210/503

    摘要： Disclosed is an adaptive canceler in which a pipelined approach is used wherein reference signals are divided into two or more sections having concurrent weight adjustment. This architecture allows the speed of adaptive cancellation to be increased and/or the number of reference taps to be increased without loss of cancellation speed. Once a continuous stream of digital data has been established in this architecture, the speed of the adaptive processor is limited only by approximately the processing time of the slowest element. The noise canceled signal may then be converted to the frequency domain in a fast Fourier transform device.

    摘要翻译： 公开了一种自适应消除器，其中使用流水线方法，其中参考信号被划分为具有并发权重调整的两个或更多个部分。 该结构允许自适应消除的速度增加和/或参考抽头的数量增加而不损失取消速度。 一旦在该架构中建立了连续的数字数据流，则自适应处理器的速度仅受到最慢元素的处理时间的约束。 然后，噪声消除信号可以在快速傅立叶变换装置中被转换成频域。

    Active adaptive noise canceller without training mode
    89.
    发明授权
    Active adaptive noise canceller without training mode 失效
    没有训练模式的主动自适应噪声消除器

    公开(公告)号：US5117401A

    公开(公告)日：1992-05-26

    申请号：US568289

    申请日：1990-08-16

    申请人： Paul L. Feintuch

    发明人： Paul L. Feintuch

    IPC分类号： G10K11/178

    CPC分类号： G10K11/1784 ,  G10K2210/30232 ,  G10K2210/3045 ,  G10K2210/3053 ,  G10K2210/503 ,  Y10S367/901

    摘要： An active adaptive noise canceller that inserts delays in the weight update logic of an adaptive filter employed by the canceller to make the filter stable. It has been found that there is a great deal of flexibility regarding the selection of the delay values. This insensitivity permits designing the delays in advance, and not having to adjust them to different situations as they change, thus no longer requiring a training mode. The canceller dramatically reduces the amount of hardward needed to perform active adaptive noise cancelling, and eliminates the need for the training mode, which in some applications, including automobiles, for example, can be as objectionable as the noise sources that are to be suppressed.