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    AN ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE
    2.
    发明申请
    AN ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE 审中-公开
    自适应噪声取消个人音乐设备的架构

    公开(公告)号：WO2012166273A3

    公开(公告)日：2013-09-19

    申请号：PCT/US2012035815

    申请日：2012-04-30

    Applicant: CIRRUS LOGIC INC

    Inventor： HENDRIX JON D ,  KAMATH GAUTHAM DEVENDRA ,  KWATRA NITIN ,  ABDOLLAHZADEH MILANI ALI ,  ALDERSON JEFFREY

    IPC: G10K11/178

    CPC classification number: G10K11/178 ,  G10K11/17827 ,  G10K11/1784 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/30232 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3051 ,  G10K2210/3055 ,  H04R1/1083 ,  H04R3/005

    Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal that measures the ambient audio and an error microphone signal that measures the output of an output transducer plus any ambient audio at that location and injects the anti-noise signal at the transducer output to cause cancellation of ambient audio sounds. A processing circuit uses the reference and error microphone to generate the anti- noise signal, which can be generated by an adaptive filter operating at a multiple of the ANC coefficient update rate. Downlink audio can be combined with the high data rate anti-noise signal by interpolation. High-pass filters in the control paths reduce DC offset in the ANC circuits, and ANC coefficient adaptation can be halted when downlink audio is not detected.

    Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从测量环境音频的参考麦克风信号和测量输出的输出的误差麦克风信号中产生抗噪声信号 传感器加上该位置的任何环境音频，并将抗噪声信号注入换能器输出，以引起环境音频声音的消除。 处理电路使用参考误差麦克风来产生抗噪声信号，该噪声信号可以由以ANC系数更新率的倍数操作的自适应滤波器生成。 下行音频可以通过插值与高数据速率的抗噪声信号组合。 控制路径中的高通滤波器减少ANC电路中的DC偏移，并且当未检测到下行链路音频时，可以停止ANC系数自适应。

    ANR SIGNAL PROCESSING ENHANCEMENTS
    3.
    发明申请
    ANR SIGNAL PROCESSING ENHANCEMENTS 审中-公开
    ANR信号处理增强

    公开(公告)号：WO2010129226A3

    公开(公告)日：2011-01-20

    申请号：PCT/US2010032403

    申请日：2010-04-26

    Applicant: BOSE CORP ,  CARRERAS RICARDO F ,  JOHO MARCEL ,  GAUGER DANIEL M ,  ISABELLE STEVEN H

    Inventor： CARRERAS RICARDO F ,  JOHO MARCEL ,  GAUGER DANIEL M ,  ISABELLE STEVEN H

    IPC: G10K11/178

    CPC classification number: G10K11/178 ,  G10K2210/3028 ,  G10K2210/3044 ,  G10K2210/3051

    Abstract: An ANR circuit, possibly of a personal ANR device and possibly within an ADC of the ANR circuit, feedback reference data, feedforward reference data and/or pass-through audio data is provided to a secondary downsampling (and/or decimating) filter and/or is provided to a calculating block (e.g., RMS or absolute calculation block) to derive side-chain data to be output by the ANR circuit to a processing device coupled to the ANR circuit to employ the side-chain data in an analysis related to the provision of feedback-based ANR, feedforward-based ANR and/or pass-through audio by the ANR circuit. In an ANR circuit of a personal ANR device, a digital filter is structured to introduce one or more zeros to add gain to introduce positive phase in the provision of feedback-based ANR, wherein the gain follows a frequency-dependent "ski-slope" gain curve with little gain added at lower audible frequencies, with increasing gain that increases with frequency added at higher audible frequencies, and with the increasing gain flattening at frequencies above audible frequencies.

    Abstract translation: 将可能是个人ANR设备并且可能在ANR电路的ADC内的ANR电路，反馈参考数据，前馈参考数据和/或通过音频数据提供给次级下采样（和/或抽取）滤波器和/ 或提供给计算块（例如，RMS或绝对计算块）以导出由ANR电路输出到耦合到ANR电路的处理装置的侧链数据，以在与以下分析有关的分析中使用侧链数据： 由ANR电路提供基于反馈的ANR，基于前馈的ANR和/或通过音频。 在个人ANR设备的ANR电路中，数字滤波器被构造为引入一个或多个零点以增加增益以在提供基于反馈的ANR中引入正相位，其中增益遵循频率相关的“滑雪斜坡” 在可听频率较低的情况下增益增益较小的增益曲线，增加的增益随着可听频率增加时的频率增加而增加，并且在可听频率以上的频率增益增大。

    ACTIVE NOISE RECUCTION
    5.
    发明申请
    ACTIVE NOISE RECUCTION 审中-公开
    主动噪声恢复

    公开(公告)号：WO1992018975A1

    公开(公告)日：1992-10-29

    申请号：PCT/GB1992000642

    申请日：1992-04-09

    Applicant: ACTIVE NOISE AND VIBRATION TECHNOLOGIES INC. ,  NADIM, Mohammed

    Inventor： ACTIVE NOISE AND VIBRATION TECHNOLOGIES INC.

    IPC: G10K11/16

    CPC classification number: F16F15/02 ,  G10K11/178 ,  G10K2210/107 ,  G10K2210/129 ,  G10K2210/3011 ,  G10K2210/3031 ,  G10K2210/3032 ,  G10K2210/3045 ,  G10K2210/3051

    Abstract: Primary vibrations (N), e.g. acoustic noise or vibration from a source thereof such as a motor, are cancelled by secondary vibrations (C) produced by an actuator (2) driven by a controller (3) that is responsive to an error signal (E) detected by a detector (4) and representative of the residual or difference between the primary and secondary vibrations. The controller samples the error signal (E) during successive sampling periods determined by a synchronising signal (syn) taken from the motor. The secondary vibrations Cn+1 for a sampling period n+1 are determined as follows: Cn+1 = Cn- mu EnSGN[1/H &cir& NOt ], where Cn represents the secondary vibrations produced during a preceding sampling period (n); En represents the detected error signal for said preceding period n, H represents the transfer coefficient between the actuator (2) and the detector (4) and mu is a scaling factor where 0

    Abstract translation: 初级振动（N），例如 来自诸如电动机的源的声学噪声或振动被由由控制器（3）驱动的致动器（2）产生的响应于由检测器检测到的误差信号（E）产生的二次振动（C） 4）并代表主振动与次振之间的残差或差值。 控制器在由从电动机获取的同步信号（syn）确定的连续采样周期期间对误差信号（E）进行采样。 采样周期n + 1的二次振动Cn + 1如下确定：Cn + 1 = Cn-mu EnSGN [1 / H＆Cir＆NOt]，其中Cn表示在之前的采样周期（n）中产生的次级振动; En表示所述前一周期n的检测误差信号，H表示致动器（2）和检测器（4）之间的传递系数，μ是0 = 1的比例因子。该装置处于 一个实施例被配置为用于个人计算机（PC）的附加单元，其包括适合于PC的扩展槽中的电路板。

    SYSTEM FOR COMPUTATIONALLY EFFICIENT ACTIVE CONTROL OF TONAL SOUND OR VIBRATION
    8.
    发明申请
    SYSTEM FOR COMPUTATIONALLY EFFICIENT ACTIVE CONTROL OF TONAL SOUND OR VIBRATION 审中-公开
    用于计算有效控制声压或振动的系统

    公开(公告)号：WO02069316A3

    公开(公告)日：2003-05-01

    申请号：PCT/US0205916

    申请日：2002-02-27

    Applicant: SIKORSKY AIRCRAFT CORP

    Inventor： WELSH WILLIAM ARTHUR ,  MACMARTIN DOUGLAS G ,  FINN ALAN M

    IPC: G05B5/01 ,  G10K11/178

    CPC classification number: G05B5/01 ,  G05B21/02 ,  G10K11/178 ,  G10K2210/121 ,  G10K2210/1281 ,  G10K2210/3012 ,  G10K2210/3032 ,  G10K2210/3051 ,  G10K2210/3053 ,  G10K2210/321

    Abstract: A noise or vibration control system reduces a sampling rate and reduces a control rate to improve computation efficiency. The present invention permits the use of a sample frequency (fs) that is less than twice the frequency of interest (fd). The sensed signals are filtered to extract a particular frequency range with a lower bound given by (2n-1)*fs/2 and an upper bound given by (2n+1)*fs/2, where n is an integer chosen so that the frequency of interest (fd) is within the extracted frequency range. The control commands are also calculated at a reduced rate, which is dependent upon the bandwidth of the tone, rather than the absolute frequency of the tone. Rather than updating the control signals directly on the sampled sensor data yk as it enters the computer, the control computations are done on the harmonic ak and bk, or equivalently on the magnitude and phase.

    Abstract translation: 噪声或振动控制系统降低采样率并降低控制速率以提高计算效率。 本发明允许使用小于感兴趣频率（fd）的两倍的采样频率（fs）。 对所感测的信号进行滤波以提取具有由（2n-1）* fs / 2给出的下限和由（2n + 1）* fs / 2给出的上限的特定频率范围，其中n是选择的整数，使得 感兴趣的频率（fd）在提取的频率范围内。 控制命令也以降低的速率计算，这取决于音调的带宽，而不是音调的绝对频率。 在采样传感器数据yk进入计算机时，不是直接更新控制信号，而是在谐波ak和bk上进行控制计算，或等效于幅度和相位。

    SYSTEM FOR COMPUTATIONALLY EFFICIENT ACTIVE CONTROL OF TONAL SOUND OR VIBRATION
    9.
    发明申请
    SYSTEM FOR COMPUTATIONALLY EFFICIENT ACTIVE CONTROL OF TONAL SOUND OR VIBRATION 审中-公开
    用于计算有效控制声压或振动的系统

    公开(公告)号：WO2002069316A2

    公开(公告)日：2002-09-06

    申请号：PCT/US2002/005916

    申请日：2002-02-27

    Applicant: SIKORSKY AIRCRAFT CORPORATION

    Inventor： WELSH, William, Arthur ,  MACMARTIN, Douglas, G. ,  FINN, Alan, M.

    IPC: G10K

    CPC classification number: G05B5/01 ,  G05B21/02 ,  G10K11/178 ,  G10K2210/121 ,  G10K2210/1281 ,  G10K2210/3012 ,  G10K2210/3032 ,  G10K2210/3051 ,  G10K2210/3053 ,  G10K2210/321

    Abstract: A noise or vibration control system reduces a sampling rate and reduces a control rate to improve computation efficiency. The present invention permits the use of a sample frequency (f s ) that is less than twice the frequency of interest (f d ). The sensed signals are filtered to extract a particular frequency range with a lower bound given by (2n-1)*f s /2 and an upper bound given by (2n+1)*f s /2, where n is an integer chosen so that the frequency of interest (f d ) is within the extracted frequency range. The control commands are also calculated at a reduced rate, which is dependent upon the bandwidth of the tone, rather than the absolute frequency of the tone. Rather than updating the control signals directly on the sampled sensor data y k as it enters the computer, the control computations are done on the harmonic a k and b k , or equivalently on the magnitude and phase.

    Abstract translation: 噪声或振动控制系统降低采样率并降低控制速率以提高计算效率。 本发明允许使用小于感兴趣频率（fd）的两倍的采样频率（fs）。 所感测的信号被滤波以提取具有由（2n-1）* fs / 2给出的下限和由（2n + 1）* fs / 2给出的上限的特定频率范围，其中n是选择的整数，使得 感兴趣的频率（fd）在提取的频率范围内。 控制命令也以降低的速率计算，这取决于音调的带宽，而不是音调的绝对频率。 在采样传感器数据yk进入计算机时，不是直接更新控制信号，而是在谐波ak和bk上进行控制计算，或等效于幅度和相位。

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