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104 条记录 (耗时 0.015 秒)

    ADAPTIVE CONTROL SYSTEM WITH EFFICIENTLY CONSTRAINED ADAPTATION
    21.
    发明授权
    ADAPTIVE CONTROL SYSTEM WITH EFFICIENTLY CONSTRAINED ADAPTATION 有权
    凭借高效的强制调节自适应控制系统

    公开(公告)号：EP1019902B1

    公开(公告)日：2003-12-17

    申请号：EP98939324.4

    申请日：1998-08-10

    申请人： Siemens VDO Automotive Inc.

    发明人： POPOVICH, Steven, R.

    IPC分类号： G10K11/178

    CPC分类号： G10K11/17883 ,  G10K11/17854 ,  G10K2210/3039 ,  G10K2210/511 ,  G10K2210/512

    摘要： An adaptive control system implements a back-projection technique to limit adaptation of adaptive parameters in the system so that system actuators are not driven beyond desired physical limitations. When the optimal controller solution lies outside of a desired region in the parameter space, chosen in accordance with the physical limitations of the system, adaptation is back-projected onto or near a smooth convex surface defining the edge of the desired region. Adaptation is preferably normalized to improve adaptation convergence. Back-projection is preferably compensated in accordance with adaptation normalization to facilitate convergence. To lessen computational burdens, adaptation and/or back-projection is accomplished in accordance with a time-sharing technique in which orthogonal components are separately processed. The technique can be implemented in tonal control systems, and in systems capable of controlling non-periodic disturbances.

    Active acoustic attenuation system with power limiting
    23.
    发明授权
    Active acoustic attenuation system with power limiting 失效
    带功率限制有源声学阻尼装置

    公开(公告)号：EP0581565B1

    公开(公告)日：2000-06-21

    申请号：EP93305902.4

    申请日：1993-07-27

    申请人： NELSON INDUSTRIES, INC.

    发明人： Delfosse, Kent F. ,  Steenhagen, Shawn K.

    IPC分类号： G10K11/16

    CPC分类号： G10K11/178 ,  G10K2210/3017 ,  G10K2210/3039 ,  G10K2210/3045 ,  G10K2210/3049 ,  G10K2210/3222 ,  G10K2210/3228

    摘要： An active acoustic attenuation system prevents overdriving of the canceling output transducer or speaker (14) by shunting at least part of the correction signal (46) to a parallel shunt path (306) and away from the output transducer (14). Variable gains (308 and 310) are provided in the shunt path (306) and the input to the output transducer (14) for varying the ratio between the part of the correction signal (46) supplied to the output transducer (14) and the part of the correction signal (46) shunted to the shunt path (306). A first adaptive filter model (40) has an error input (202) from the error signal and outputs the correction signal (46). A second adaptive filter model (142) models the output transducer (14) and the error path (56) between the output transducer (14) and the error transducer (16). A copy (312) of the second model (142) has an input from the output (46) of the first model (40), and the output of the copy (312) is summed with the error signal (44) and the resultant sum is supplied to the error input (202) of the first model (40), such that the shunt path (306) is provided through the model copy (312).

    Dispositif anti-bruit à détection de seuil
    24.
    发明公开
    Dispositif anti-bruit à détection de seuil 审中-公开
    Lärmkontrollegerätmit Schwellwert-Detektion

    公开(公告)号：EP0935236A1

    公开(公告)日：1999-08-11

    申请号：EP99400221.0

    申请日：1999-02-02

    申请人： SAGEM SA

    发明人： Housni, Jamal

    IPC分类号： G10K11/178

    CPC分类号： G10K11/178 ,  G10K2210/1081 ,  G10K2210/3039 ,  G10K2210/3222 ,  G10K2210/3224 ,  G10K2210/509

    摘要： Dispositif anti-bruit comportant au moins une oreillette (13) ayant une cavité (2) délimitée par des moyens d'atténuation passive (3), un circuit d'atténuation active (4) ayant un domaine spatial d'efficacité et comportant au moins une unité de traitement (6) électronique reliée à des organes d'atténuation active (5, 7) comprenant au moins un microphone (5) captant des ondes sonores dans la cavité et un haut-parleur (7) disposé dans les cavités pour émettre des ondes sonores d'atténuation active élaborées par l'unité de traitement (6), au moins un organe interrupteur (8) sélectivement actionnable entre un état de service du circuit d'atténuation active et un état de repos du circuit d'atténuation active, un microphone de détection de seuil (10) captant des bruits extérieurs au domaine spatial d'efficacité du circuit d'atténuation active, des moyens de filtrage (3) associés au microphone de détection de seuil pour éliminer des bruits correspondant aux bruits absorbés par les moyens d'atténuation passive, et un détecteur (9) de dépassement d'un seuil de bruit pour commander l'organe interrupteur (8) dans l'état de service ou de repos du circuit d'atténuation active en fonction d'un niveau de puissance des bruits détectés en aval des moyens de filtrage.

    摘要翻译： 该系统基于标准耳罩，包括一个具有吸声衬垫的腔体，其旨在覆盖耳朵。 一个附加的有源噪声抑制电路由麦克风，放大器和扬声器组成，以产生有源负音频反馈。 第二麦克风检测这些信号的电平，并且仅当噪声超过预定阈值时才能使能放大器。

    Method and apparatus for attenuating noise
    28.
    发明授权
    Method and apparatus for attenuating noise 失效
    用于噪声衰减的方法和装置。

    公开(公告)号：EP0492680B1

    公开(公告)日：1995-07-19

    申请号：EP91203005.3

    申请日：1991-11-19

    申请人： GENERAL MOTORS CORPORATION

    发明人： Pfaff, Donald Paul ,  Kapsokavathis, Nick S.

    IPC分类号： H03H21/00 ,  G10K11/16

    CPC分类号： F01N1/065 ,  G10K11/178 ,  G10K2210/121 ,  G10K2210/12822 ,  G10K2210/3037 ,  G10K2210/3039 ,  G10K2210/3045 ,  G10K2210/3046 ,  G10K2210/3211 ,  H03H21/0012

    摘要： A method and apparatus are described for controlling output saturation in adaptive digital filters (30) used in active noise control systems. A practical adaptive filter (30) has a specified maximum value for its output signal, above which the output signal becomes clipped and filter output saturation occurs. According to the described method and apparatus, the filter output signal value (OUTPUT(n)) is monitored to detect the occurrence of filter output saturation. Then, the filter (30) is adjusted to reduce the value of the output signal (OUTPUT(n)), when output saturation is detected. Based upon the detection of filter output saturation, a power reference level is established to estimate the maximum average power that the output signal (OUTPUT(n)) can contain without causing saturation. The filter weighting coefficients are then adjusted in accordance with the difference between the established power reference level and a computed average power associated with the filter output signal (OUTPUT(n)).

    Automatic sound controlling apparatus
    29.
    发明公开
    Automatic sound controlling apparatus 失效
    自动声控装置

    公开(公告)号：EP0526111A3

    公开(公告)日：1994-06-08

    申请号：EP92306756.5

    申请日：1992-07-23

    申请人： FUJITSU TEN LIMITED

    发明人： Nagami, Masaaki ,  Sako, Kazuya

    IPC分类号： G10K11/16

    CPC分类号： F01N1/065 ,  G10K11/178 ,  G10K2210/128 ,  G10K2210/1282 ,  G10K2210/12822 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3032 ,  G10K2210/3033 ,  G10K2210/3039 ,  G10K2210/30391 ,  G10K2210/3041 ,  G10K2210/3042 ,  G10K2210/3045 ,  G10K2210/501 ,  G10K2210/503

    摘要： An automatic sound controlling apparatus including an electric signal/sound converter (2) outputting a compensating sound to a canceling object space to cancel a sound from a sound producing source (1) and a sound/electric converter (3) for converting a residual sound of the sound canceling with a compensating signal from the electric/sound converter (2) into an electric signal. A first adaptive filtering means (4) controls the filter coefficients based on a signal from the sound/electric converter (3) to form a compensating signal to the electric/sound converter (2) for canceling a stationary sound. A transfer characteristics stimulating means (5) stimulates transfer characteristics of the electric/sound converter (2), the sound/electric converter (3) and the sound of the canceling object space. A difference signal calculating means (6) calculates a difference signal between outputs of the sound/electric converter (3) and the transfer characteristics stimulating means (5) to supply the first adaptive filtering means (4) with a difference signal. A signal producing means (7) produces a predetermined shape signal based on a timing signal with respect to a sound producing period of the sound producing source (1). A second adaptive filtering means (8) controls filter coefficients based on a signal from the sound/electric converter (3) to form a compensating signal to the electric/sound converter (2) for canceling a fluctuating sound. And adding means (9) adds an output signal of the first adaptive filtering means (4) and an output signal of the second adaptive filtering means (8) to output the adding signal to the electric/sound converter (2) and the transfer characteristics stimulating means (5).

    摘要翻译： 自动声音控制装置包括形成用于消除静止声音的补偿信号的第一自适应滤波器（4）。 信号发生器（7）基于声音产生源（1）的定时信号产生预定形状的信号，例如， 相对于声音产生源（1）的发声周期的汽车发动机。 第二自适应滤波器（8）形成用于消除具有预定形状的信号的波动声音的补偿信号，由此在发声周期急剧变化的情况下，输出第二自适应滤波器（8）的输出信号，而不是输出 从第一个自适应滤波器。