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104 条记录 (耗时 0.016 秒)

    Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices
    2.
    发明公开
    Ear-coupling detection and adjustment of adaptive response in noise-canceling in personal audio devices 审中-公开
    耳朵耦合的检测和向DNR的自适应响应的设置，个人音频设备

    公开(公告)号：EP2804173A3

    公开(公告)日：2015-11-11

    申请号：EP14177399.4

    申请日：2012-04-30

    申请人： Cirrus Logic, Inc.

    发明人： Abdollahzadeh Milani, Ali ,  Kamath, Gautham Devendra

    IPC分类号： G10K11/178

    CPC分类号： G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/503

    摘要： A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit (30) that adaptively generates an anti-noise signal from a reference microphone signal (ref) and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit (30) through the transducer. A processing circuit (37, 38, K1, K2) determines a degree of coupling between the user's ear and the transducer and adjusts the adaptive cancellation of the ambient sounds to prevent erroneous and possibly disruptive generation of the anti-noise signal if the degree of coupling lies either below or above a range of normal operating ear contact pressure.

    Active noise cancellation system
    4.
    发明公开
    Active noise cancellation system 审中-公开
    主动噪音消除系统

    公开(公告)号：EP1154402A3

    公开(公告)日：2003-06-04

    申请号：EP01201188.8

    申请日：2001-03-30

    申请人： Siemens VDO Automotive Inc.

    发明人： Daly, Paul D.

    IPC分类号： G10K11/178

    CPC分类号： F02M35/125 ,  G10K11/178 ,  G10K2210/121 ,  G10K2210/3031 ,  G10K2210/3039

    摘要： The air induction system comprises an air intake and speaker disposed about the air intake. A control unit is in communication with the speaker. At least one receiver permits communication between the control unit and at least one powertrain input. An engine computer may communicate the powertrain input to the receiver and prevent such communication at a predetermined threshold based on engine load.

    Active noise control system
    5.
    发明公开
    Active noise control system 审中-公开
    AktivesLärmverminderungssystem

    公开(公告)号：EP1158488A2

    公开(公告)日：2001-11-28

    申请号：EP01304486.2

    申请日：2001-05-22

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Nakamura, Yoshio ,  Ohashi, Toshihiko ,  Terai, Kenichi ,  Hashimoto, Hiroyuki ,  Kakuhari, Isao ,  Sano, Hisahi ,  Inoue, Toshio ,  Takahashi, Akira ,  Yamashita, Tsuyoshi

    IPC分类号： G10K11/178

    CPC分类号： G10K11/178 ,  G10K2210/12821 ,  G10K2210/3039

    摘要： An active noise control system for reducing road noise of low frequency generated inside the cabin (106) of a vehicle (105) is provided. The active noise control system includes a noise detector (101), a signal generator (102) for processing the input noise signal to generate a signal for producing noise canceling waves, a limiting amplifier (103) having a specified threshold value for variably amplifying the processed signal so that the amplitude of output signal will not exceed the threshold value, and an electrical acoustic converter (104) for producing noise canceling acoustic waves in accordance with the output signal.

    摘要翻译： 提供一种用于减少在车辆（105）的车厢（106）内部产生的低频道路噪声的主动噪声控制系统。 有源噪声控制系统包括噪声检测器（101），用于处理输入噪声信号以产生用于产生噪声消除波的信号的信号发生器（102），具有指定阈值的限幅放大器（103），用于可变放大 处理后的信号，使得输出信号的振幅不超过阈值，以及用于根据输出信号产生噪声消除声波的电声转换器（104）。

    Noise control system
    6.
    发明公开
    Noise control system 有权
    噪声控制设备

    公开(公告)号：EP0973151A2

    公开(公告)日：2000-01-19

    申请号：EP99113651.6

    申请日：1999-07-14

    申请人： Matsushita Electric Industrial Co., Ltd.

    发明人： Terai, Kenichi ,  Hashimoto, Hiroyuki ,  Kakuhari, Isao

    IPC分类号： G10K11/178

    CPC分类号： G10K11/178 ,  G10K2210/3012 ,  G10K2210/3027 ,  G10K2210/3039

    摘要： A noise control system includes: a control sound generator (1) for generating a control sound; an error detector (2) for detecting an error signal between the control sound and noise; a noise detector (3) for detecting a noise source signal; an adaptive filter (4) for outputting a control signal; and a coefficient updator for updating a coefficient of the adaptive filter (4). The coefficient updator includes at least a first digital filter (5), a first coefficient update calculator (6), a second digital filter (7), a phase inverter (10), a third digital filter (8), and a second coefficient update calculator (9). Alternatively, the coefficient updator includes at least a first digital filter, a second digital filter, a third digital filter, a coefficient update calculator, a phase inverter, a first adder, and a second adder. In either case, the coefficient updator has a function of suppressing an increase in a coefficient gain of the adaptive filter in a predetermined frequency band.

    ACTIVE NOISE-CANCELLATION SYSTEM FOR AUTOMOTIVE MUFFLERS
    8.
    发明授权
    ACTIVE NOISE-CANCELLATION SYSTEM FOR AUTOMOTIVE MUFFLERS 失效
    主动降噪系统技术KRAFTFAHRZEUSCHALLDÄMPFER

    公开(公告)号：EP0634919B1

    公开(公告)日：1998-03-18

    申请号：EP94908593.0

    申请日：1994-01-14

    申请人： AT&T Corp.

    发明人： Browning, Douglas, Roy ,  Zuniga, Michael, Anthony

    IPC分类号： A61F11/06 ,  H03B29/00 ,  H04B15/00 ,  F01N1/06 ,  G10K11/00

    CPC分类号： F01N1/065 ,  G10K11/178 ,  G10K2210/112 ,  G10K2210/12822 ,  G10K2210/3039 ,  G10K2210/3045

    摘要： In an active control noise-cancelling muffler system, a substantially complete acoustic and mechanical decoupling of the noise-cancelling signal pipe from the gas exhaust pipe is achieved. The noise-cancelling signal delivery pipe is physically isolated and separate from the gas exhaust pipe, and is mounted separately. The outlet end of both pipes are essentially coplanar. Using pressure sensors on the tubes, the system also accurately and continuously electronically replicates the mixing of the exhaust noise and the noise-cancelling acoustic energy that goes on in the space immediately beyond the two outlets. This electronic signal is a useful alternative for a direct measure of the resultant two acoustic waves when they mix in the space beyond the tube outlets, and allows the system to continuously estimate the degree of success of noise cancellation without having to measure it directly when impractical. The system uses measures of pressure and temperature of the two tubes to continuously adjust a transducer drive signal that drives the sum of the pressures at the two tube outlets toward zero. An advantageous algorithm for the control process is identified.

    REDUCED VLF OVERLOAD SUSCEPTIBILITY ACTIVE NOISE CANCELLATION HEADSET
    10.
    发明公开
    REDUCED VLF OVERLOAD SUSCEPTIBILITY ACTIVE NOISE CANCELLATION HEADSET 失效
    降低VLF过载灵敏度有源噪声消除头戴式耳机

    公开(公告)号：EP0705471A1

    公开(公告)日：1996-04-10

    申请号：EP94921355.0

    申请日：1994-06-22

    申请人： NOISE CANCELLATION TECHNOLOGIES, INC.

    发明人： JONES, Owen

    IPC分类号： G10K11

    CPC分类号： G10K11/178 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3039 ,  G10K2210/3045

    摘要： The susceptibility of an active noise cancellation system to overloading due to very low frequencies is reduced by subtracting the low frequency components of an applied noise field from the residual signal. Low frequency components of the applied noise field outside the normal range of human hearing are detected by an external sensor and isolated by a filter circuit. The isolated low frequency signal is subtracted from the residual signal, resulting in a modified residual signal with reduced low frequency components. The cancellation system thus eliminates very low frequency cancellation signals, without sacrificing bandwidth or system performance within the audible range.

    摘要翻译： 通过从残余信号中减去所施加的噪声场的低频分量来减少主动噪声消除系统由于非常低的频率而导致的过载的敏感度。 外部传感器（14）检测在人听力正常范围之外的施加噪声场的低频分量，并由滤波器电路（15）隔离。 从残余信号中减去隔离的低频信号，产生具有减少的低频分量的修改的残余信号。 消除系统因此消除了非常低的频率消除信号，而不牺牲可听范围内的带宽或系统性能。