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16 条记录 (耗时 0.013 秒)

    Pre-shaping series filter for active noise cancellation adaptive filter
    4.
    发明授权
    Pre-shaping series filter for active noise cancellation adaptive filter 有权
    用于主动降噪自适应滤波器的预整形串联滤波器

    公开(公告)号：US09082389B2

    公开(公告)日：2015-07-14

    申请号：US13629279

    申请日：2012-09-27

    申请人： Apple Inc.

    发明人： Guy C. Nicholson ,  Thomas M. Jensen

    IPC分类号： G10K11/16 ,  G10K11/178

    CPC分类号： G10K11/1782 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3028

    摘要： A feed forward active noise cancellation (ANC) system for use in a portable audio device has an adaptive digital filter and a reference microphone. A non-adaptive pre-shaping digital filter has an input coupled to the reference microphone and is in series with, and in front of, the adaptive filter. The pre-shaping filter is minimum phase and presents at least 2 dB more gain over a low audio frequency band than over a high audio frequency band. This may help compensate for low frequency band difficulties, and may thereby extend ANC bandwidth at the low end without a worsening impact on the high end. Other embodiments are also described and claimed.

    摘要翻译： 用于便携式音频设备的前馈有源噪声消除（ANC）系统具有自适应数字滤波器和参考麦克风。 非自适应预整形数字滤波器具有耦合到参考麦克风并与自适应滤波器串联并在其前面的输入。 预成形滤波器是最小相位，并且在低音频频带上比在高音频频带上具有至少2dB的增益。 这可能有助于补偿低频带的困难，从而可以在低端扩展ANC带宽，而不会对高端产生恶化的影响。 还描述和要求保护其他实施例。

    HEADPHONE ACOUSTIC NOISE CANCELLATION AND SPEAKER PROTECTION
    6.
    发明申请
    HEADPHONE ACOUSTIC NOISE CANCELLATION AND SPEAKER PROTECTION 有权

    公开(公告)号：US20210097970A1

    公开(公告)日：2021-04-01

    申请号：US17019774

    申请日：2020-09-14

    申请人： Apple Inc.

    发明人： Tom-Davy W. Saux ,  Brian D. Clark ,  Thomas M. Jensen ,  Vladan Bajic

    IPC分类号： G10K11/178 ,  H04R1/10 ,  H04R1/40 ,  H04R3/00

    摘要： An audio system has an ambient sound enhancement (ASE) function, in which an against-the-ear audio device having a speaker converts a digitally processed version of an input audio signal into amplified sound. The amplification may be in accordance with a stored hearing profile of the user. The audio system also has an acoustic noise cancellation (ANC) function that may be combined in various ways with the ASE function, and that may be responsive to voice activity detection. Other aspects are also described and claimed.

    ACTIVE NOISE CANCELLATION USING MULTIPLE REFERENCE MICROPHONE SIGNALS
    8.
    发明申请
    ACTIVE NOISE CANCELLATION USING MULTIPLE REFERENCE MICROPHONE SIGNALS 有权
    使用多个参考麦克风信号进行主动噪声消除

    公开(公告)号：US20140086425A1

    公开(公告)日：2014-03-27

    申请号：US14035662

    申请日：2013-09-24

    申请人： Apple Inc.

    发明人： Thomas M. Jensen ,  Vladan Bajic ,  Andrew P. Bright

    IPC分类号： G10K11/16

    CPC分类号： G10K11/16 ,  G10K11/17854 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3018 ,  G10K2210/3056

    摘要： In one aspect, multiple adaptive W filters and associated adaptive filter controllers are provided that use multiple reference microphone signals to produce multiple, “component” anti-noise signals. These are gain weighted and summed to produce a single anti-noise signal, which drives an earpiece speaker. The weighting changes based on computed measures of the coherence between content in each reference signal and content in an error signal. Other embodiments are also described and claimed.

    摘要翻译： 在一个方面，提供了多个自适应W滤波器和相关联的自适应滤波器控制器，其使用多个参考麦克风信号来产生多个“分量”抗噪声信号。 这些是增益加权和相加以产生单个抗噪声信号，其驱动耳机扬声器。 基于每个参考信号中的内容与误差信号中的内容之间的相干性的计算测量值，加权变化。 还描述和要求保护其他实施例。

    Active noise cancellation using multiple reference microphone signals
    9.
    发明授权
    Active noise cancellation using multiple reference microphone signals 有权
    使用多个参考麦克风信号的主动噪声消除

    公开(公告)号：US09330652B2

    公开(公告)日：2016-05-03

    申请号：US14035662

    申请日：2013-09-24

    申请人： Apple Inc.

    发明人： Thomas M. Jensen ,  Vladan Bajic ,  Andrew P. Bright

    IPC分类号： G10K11/16 ,  G10K11/178

    CPC分类号： G10K11/16 ,  G10K11/17854 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3018 ,  G10K2210/3056

    摘要： In one aspect, multiple adaptive W filters and associated adaptive filter controllers are provided that use multiple reference microphone signals to produce multiple, “component” anti-noise signals. These are gain weighted and summed to produce a single anti-noise signal, which drives an earpiece speaker. The weighting changes based on computed measures of the coherence between content in each reference signal and content in an error signal. Other embodiments are also described and claimed.

    摘要翻译： 在一个方面，提供了多个自适应W滤波器和相关联的自适应滤波器控制器，其使用多个参考麦克风信号来产生多个“分量”抗噪声信号。 这些是增益加权和相加以产生单个抗噪声信号，其驱动耳机扬声器。 基于每个参考信号中的内容与误差信号中的内容之间的相干性的计算测量值，加权变化。 还描述和要求保护其他实施例。

    Prevention of ANC instability in the presence of low frequency noise
    10.
    发明授权
    Prevention of ANC instability in the presence of low frequency noise 有权
    在存在低频噪声的情况下防止ANC不稳定

    公开(公告)号：US09129586B2

    公开(公告)日：2015-09-08

    申请号：US13709919

    申请日：2012-12-10

    申请人： Apple Inc.

    发明人： Vladan Bajic ,  Thomas M. Jensen

    IPC分类号： G10K11/00 ,  G10K11/178

    CPC分类号： G10K11/002 ,  G10K11/178 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/30231 ,  G10K2210/3028 ,  G10K2210/511

    摘要： An active noise control (ANC) processor has an adaptive filter that uses a reference signal to produce an anti-noise signal, and an error signal to evaluate cancellation performance. An adaptive filter algorithm engine configures the filter coefficients of the adaptive filter, in accordance with pre-shaped versions of the error and reference signals. The pre-shaping filter has a high-pass transfer function and enables the adaptive algorithm engine to increase noise cancellation performance in a high frequency band during the presence of focused or narrow-band noise energy in a low frequency band. Other embodiments are also described and claimed.

    摘要翻译： 主动噪声控制（ANC）处理器具有使用参考信号产生抗噪声信号的自适应滤波器和用于评估取消性能的误差信号。 自适应滤波器算法引擎根据预先形状的错误和参考信号来配置自适应滤波器的滤波器系数。 预成形滤波器具有高通传递函数，并且使得自适应算法引擎在低频带中的聚焦或窄带噪声能量的存在期间增加高频带中的噪声消除性能。 还描述和要求保护其他实施例。