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    METHOD AND SYSTEM FOR ACTIVE NOISE CANCELLATION
    11.
    发明申请
    METHOD AND SYSTEM FOR ACTIVE NOISE CANCELLATION 有权
    用于主动噪声消除的方法和系统

    公开(公告)号：US20150063583A1

    公开(公告)日：2015-03-05

    申请号：US14010667

    申请日：2013-08-27

    Applicant: Texas Instruments Incorporated

    Inventor： Chuan Ni ,  Yunhong Li ,  Long Yin Chen

    IPC: G10K11/00

    CPC classification number: G10K11/1786 ,  G10K11/17857 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/111 ,  G10K2210/3046

    Abstract: From at least a first microphone, first microphone signals are received that represent first sound waves. From at least a second microphone, second microphone signals are received that represent second sound waves. In response to the first microphone signals, first noise in the first sound waves is estimated, and first cancellation signals are output for causing a speaker array to generate first additional sound waves via at least a first acoustic beam for cancelling at least some of the first noise. In response to the second microphone signals, second noise in the second sound waves is estimated, and second cancellation signals are output for causing the speaker array to generate second additional sound waves via at least a second acoustic beam for cancelling at least some of the second noise.

    Abstract translation: 从至少第一麦克风接收表示第一声波的第一麦克风信号。 从至少第二麦克风接收代表第二声波的第二麦克风信号。 响应于第一麦克风信号，估计第一声波中的第一噪声，并且输出第一抵消信号，以使扬声器阵列经由至少第一声束产生第一附加声波，以抵消第一声波中的至少一些 噪声。 响应于第二麦克风信号，估计第二声波中的第二噪声，并且输出第二抵消信号，以使扬声器阵列经由至少第二声束产生第二附加声波，以抵消第二声波中的至少一些第二声波 噪声。

    Active noise cancellation
    12.
    发明授权
    Active noise cancellation 有权
    主动降噪

    公开(公告)号：US08750531B2

    公开(公告)日：2014-06-10

    申请号：US12913897

    申请日：2010-10-28

    Applicant: Cary L. Delano ,  Steven M. Waldstein

    Inventor： Cary L. Delano ,  Steven M. Waldstein

    IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  G10L21/0216

    CPC classification number: G10L21/0216 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/111 ,  G10L2021/02161

    Abstract: This document discusses, among other things, systems and methods for active noise cancellation. One example system includes a digital ANC circuit configured to receive first audio information from a first microphone and to produce an a digital anti-noise signal configured to attenuate noise sensed by the first microphone; an analog ANC circuit configured to receive second audio information from a second microphone and to produce an analog anti-noise signal configured to attenuate noise sensed by the second microphone; and wherein the system is configured to receive an intended audio signal and to provide an output signal for a speaker using the intended audio signal, the analog anti-noise signal, and the digital anti-noise signal.

    Abstract translation: 本文件还讨论了主动噪声消除的系统和方法。 一个示例性系统包括数字ANC电路，其被配置为从第一麦克风接收第一音频信息并产生被配置为衰减由第一麦克风感测的噪声的数字抗噪声信号; 模拟ANC电路被配置为从第二麦克风接收第二音频信息并产生被配置为衰减由第二麦克风感测的噪声的模拟抗噪声信号; 并且其中所述系统被配置为接收预期音频信号并且使用所述预期音频信号，所述模拟抗噪声信号和所述数字抗噪声信号为扬声器提供输出信号。

    Direction-aware active noise cancellation system
    13.
    发明授权
    Direction-aware active noise cancellation system 有权
    方向感知主动噪声消除系统

    公开(公告)号：US08611552B1

    公开(公告)日：2013-12-17

    申请号：US12868417

    申请日：2010-08-25

    Applicant: Carlo Murgia ,  Carlos Avendano ,  Jean Laroche

    Inventor： Carlo Murgia ,  Carlos Avendano ,  Jean Laroche

    IPC: A61F11/06

    CPC classification number: H04R1/1083 ,  A61F2011/145 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/111 ,  G10K2210/3027 ,  H04R2460/01

    Abstract: Robust feedforward active noise cancellation is provided which can overcome or substantially alleviate problems associated with the diverse and dynamic nature of the surrounding acoustic environment. A multi-faceted analysis is performed to determine the direction (or directions) of propagation of noise in the surrounding acoustic environment. The direction of propagation is then utilized to determine direction-dependent characteristics of the acoustic path between a reference position where the noise is captured and a desired position where the noise is to be cancelled. These characteristics are used to form a feedforward signal adapted to cancel the noise at the desired position. By forming the feedforward signal based on direction-dependent characteristics of the acoustic path, the techniques described herein can achieve optimal noise cancellation at the desired location, regardless of the direction of propagation of the noise.

    Abstract translation: 提供了稳健的前馈有源噪声消除，其可以克服或基本上减轻与周围声环境的多种和动态特性相关的问题。 执行多面分析以确定在周围声环境中噪声传播的方向（或方向）。 然后利用传播方向来确定捕获噪声的参考位置与要消除噪声的期望位置之间的声学​​路径的方向相关特性。 这些特性用于形成适于消除期望位置处的噪声的前馈信号。 通过基于声学路径的方向依赖特性形成前馈信号，本文描述的技术可以在期望的位置实现最佳的噪声消除，而与噪声的传播方向无关。

    Active fan blade noise cancellation system
    14.
    发明授权
    Active fan blade noise cancellation system 失效
    主动风扇叶片噪声消除系统

    公开(公告)号：US5448645A

    公开(公告)日：1995-09-05

    申请号：US203339

    申请日：1994-02-28

    Applicant: Joseph R. Guerci

    Inventor： Joseph R. Guerci

    IPC: G10K11/178 ,  G10K11/16

    CPC classification number: G10K11/1788 ,  G10K2210/104 ,  G10K2210/109 ,  G10K2210/111 ,  G10K2210/112 ,  G10K2210/119 ,  G10K2210/3216

    Abstract: An active noise cancellation device and method for reducing fan blade noise over a broad spatial area. The device comprises a microphone, a band pass filter, and audio amplifier, and a speaker array. The microphone captures the sound produced by the fan and converts it into an electrical signal. This electrical signal is input to the band pass filter which has a center frequency equal to product of fan speed and the number of fan blades which comprise the fan. The band pass filter attenuates any signals other than the primary harmonic sound produced by the rotating fan blades. The filtered signal from the band pass filter is input to the audio amplifier. The audio amplifier conditions the signal for input to the speaker array. Accordingly, each speaker in the array receives and outputs an audio signal of equal amplitude and phase as that produced by the rotating fan blades. The speaker array is mounted on or close to the fan hub in a symmetric pattern commensurate with the fan blade geometry. In general, the number of speakers which comprise the array corresponds to the number of fan blades. The position of the speaker array is adjusted until a maximum destructive interference occurs between the sound produced by the rotating fan blades and the speaker array. With the addition of a phase shifter, the active noise cancellation device can be utilized to provide noise cancellation for variable speed fans.

    Abstract translation: 一种用于在宽广空间区域上降低风扇叶片噪声的主动噪声消除装置和方法。 该装置包括麦克风，带通滤波器和音频放大器以及扬声器阵列。 麦克风捕获由风扇产生的声音，并将其转换为电信号。 该电信号输入到带通滤波器，该带通滤波器的中心频率等于风扇速度的乘积和包括风扇的风扇叶片的数量。 带通滤波器衰减由旋转风扇叶片产生的一次谐波声音以外的任何信号。 来自带通滤波器的经滤波的信号被输入到音频放大器。 音频放大器调节信号以输入到扬声器阵列。 因此，阵列中的每个扬声器接收并输出与旋转的风扇叶片产生的音频信号相等的幅度和相位的音频信号。 扬声器阵列以与风扇叶片几何形状相称的对称图案安装在风扇集线器上或其附近。 通常，构成阵列的扬声器的数量对应于风扇叶片的数量。 调节扬声器阵列的位置，直到由旋转的风扇叶片和扬声器阵列产生的声音之间发生最大的相消干涉。 通过添加移相器，可以利用主动噪声消除装置为变速风扇提供噪声消除。

    Apparatus, Method, and Computer Program for Adjustable Noise Cancellation
    20.
    发明申请
    Apparatus, Method, and Computer Program for Adjustable Noise Cancellation 有权
    用于可调噪声消除的装置，方法和计算机程序

    公开(公告)号：US20160140947A1

    公开(公告)日：2016-05-19

    申请号：US15007416

    申请日：2016-01-27

    Applicant: Nokia Technologies Oy

    Inventor： Matti S. Hamalainen

    IPC: G10K11/00 ,  G10K11/178 ,  H04R1/10

    CPC classification number: G10K11/002 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/111 ,  H04R1/1083 ,  H04R5/033 ,  H04S2400/15

    Abstract: From inputs received at one or more processors, a background audio signal representing background sound is separated from a primary audio signal. The primary audio signal is output with the background audio signal or an altered version thereof according to a user selection between noise cancellation and ambient sound reproduction. More specifically, when the user selection is for noise cancelation, the primary and background audio signals are output with a first altered version of the background audio signal (for example, having inverted phase so as to destructively interfere with the background audio signal); and when the user selection is for ambient sound reproduction, the primary audio signal is output with the background audio signal or a second altered version of the background audio signal (such as a pseudo-acoustic representation of the background sound). One example embodiment is a headset with microphones and speakers for the respective inputs and outputs.

    Abstract translation: 从在一个或多个处理器处接收的输入，表示背景声音的背景音频信号与主音频信号分离。 根据用户在噪声消除和环境声音再现之间的选择，主音频信号与背景音频信号或其改变的版本一起输出。 更具体地，当用户选择用于噪声消除时，主背景音频信号和背景音频信号以背景音频信号的第一改变版本（例如，具有反相，从而相消干扰背景音频信号）被输出; 并且当用户选择用于环境声音再现时，主音频信号与背景音频信号或背景音频信号的第二改变版本（诸如背景声音的伪声音表示）一起被输出。 一个示例性实施例是具有用于相应输入和输出的麦克风和扬声器的耳机。

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