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    ACTIVE NOISE REDUCTION DEVICE AND ACTIVE NOISE REDUCTION METHOD
    1.
    发明申请
    ACTIVE NOISE REDUCTION DEVICE AND ACTIVE NOISE REDUCTION METHOD 有权
    主动噪声减少装置和主动噪声减少方法

    公开(公告)号：US20150063581A1

    公开(公告)日：2015-03-05

    申请号：US14391530

    申请日：2013-06-25

    Applicant: Panasonic intellectual property Management co., Ltd

    Inventor： Mitsuhiro Tani ,  Toshiyuki Funayama ,  Mitsuru Kaitou

    IPC: H04R3/02

    CPC classification number: H04R3/02 ,  G10K11/178 ,  G10K11/17821 ,  G10K11/17854 ,  G10K11/17881 ,  G10K2210/1282 ,  G10K2210/3054 ,  G10K2210/3055 ,  H04R3/00 ,  H04R2460/01 ,  H04R2499/13

    Abstract: An active noise reduction device is used with a secondary noise source that generates a secondary noise and an error signal source that outputs an error signal corresponding to a residual sound caused by interference between the secondary noise and a noise. A μ-adjustment unit calculates a step-size parameter for updating a filter coefficient of an adaptive filter by multiplying a standard step-size parameter by a ratio of a standard representative input value corresponding to amplitude of a signal to a representative input value corresponding to the amplitude of the signal.

    Abstract translation: 主动噪声降低装置与产生次级噪声的次级噪声源和误差信号源一起使用，该信号源输出对应于由次级噪声和噪声之间的干扰引起的残留声音的误差信号。 μ调整单元通过将标准步长参数乘以与信号幅度对应的标准代表性输入值与对应于信号的代表性输入值的比率来计算用于更新自适应滤波器的滤波器系数的步长参数 信号的幅度。

    Vehicle approach notification system and vehicle approach notification method
    2.
    发明授权
    Vehicle approach notification system and vehicle approach notification method 有权

    公开(公告)号：US12269495B2

    公开(公告)日：2025-04-08

    申请号：US17944455

    申请日：2022-09-14

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： Mitsuhiro Tani ,  Shinnosuke Nagasawa ,  Fumiyasu Konno

    IPC: B60W50/14 ,  B60W40/04 ,  B60W50/00 ,  H04R1/28

    Abstract: A vehicle approach notification system includes a filter; a notification sound controller which generates a signal corresponding to a notification sound for notifying of approaching of a vehicle, based on a sound signal obtained from a notification-sound sound source; and a setter which obtains vehicle information of the vehicle, and sets, according to the vehicle information, at least one of the notification-sound sound source to be used in generation of the notification sound, a filter property to be applied to the filter, or a control parameter to be applied to the notification sound controller in generation of the notification sound. The notification sound controller outputs the signal generated, through the filter to an exterior loudspeaker provided to the vehicle.

    Noise reduction device, vehicle, and noise reduction method
    3.
    发明授权
    Noise reduction device, vehicle, and noise reduction method 有权

    公开(公告)号：US11568851B2

    公开(公告)日：2023-01-31

    申请号：US17568373

    申请日：2022-01-04

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： Mitsuhiro Tani

    IPC: G10K11/178 ,  B60Q9/00

    Abstract: An active noise reduction device includes: a reference signal inputter; an adaptive filter; a μ adjuster that calculates a step size parameter by multiplying a reference value for the step size parameter by a correction coefficient that is proportional to a reciprocal of a first representative input value that indicates a signal level of the reference signal in a first predetermined period; a filter coefficient updater that updates adaptive filter coefficient W by using the step size parameter calculated; and a determiner. When it is determined that a second representative input value is greater than a threshold value, at least one of the adaptive filter or the filter coefficient updater is transitioned from a normal state to a restriction state in which an effect of reducing noise is smaller than in the normal state.

    Active noise reduction device, vehicle, and active noise reduction method
    4.
    发明授权
    Active noise reduction device, vehicle, and active noise reduction method 有权

    公开(公告)号：US11790883B2

    公开(公告)日：2023-10-17

    申请号：US17751250

    申请日：2022-05-23

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： Kazuhisa Kotegawa ,  Mitsuhiro Tani

    IPC: G10K11/178

    CPC classification number: G10K11/17883 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17854

    Abstract: An active noise reduction device includes: a reference signal input terminal that receives a reference signal from a reference signal source attached to an automobile; a simulated vibration transfer characteristics filter unit that generates a second signal by correcting, using simulated vibration transfer characteristics, a first signal for outputting, from a loudspeaker attached to the automobile, a sound different from a canceling sound, the simulated vibration transfer characteristics simulating vibration transfer characteristics from the loudspeaker to the reference signal source; a first subtracter that outputs a corrected reference signal obtained by subtracting the second signal generated, from the reference signal received by the reference signal input terminal; and an adaptive filter unit that applies an adaptive filter to the corrected reference signal outputted from the first subtracter to generate a canceling signal to be used to output the canceling sound.

    Active noise control device, vehicle, and active noise control method
    5.
    发明授权
    Active noise control device, vehicle, and active noise control method 有权

    公开(公告)号：US10950216B2

    公开(公告)日：2021-03-16

    申请号：US16594729

    申请日：2019-10-07

    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

    Inventor： Mitsuhiro Tani

    IPC: G10K11/178

    Abstract: An active noise control device includes: a reference signal source that outputs a reference signal having a correlation with noise; a reference signal input unit configured to receive the reference signal output from the reference signal source; a compressor that compresses the reference signal and outputs a compressed signal of the reference signal when an amplitude of the reference signal received by the reference signal input unit is greater than or equal to a threshold; and an adaptive filter unit configured to generate a canceling signal having a phase opposite to a phase of the compressed signal by multiplying the compressed signal using an adaptive filter having a coefficient that is updated successively. The coefficient of the adaptive filter is updated using a step size parameter for determining an amount of updating the coefficient of the adaptive filter based on a change in the amplitude of the reference signal.

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