Frequency-domain adaptive noise cancellation system

    公开(公告)号:US10276145B2

    公开(公告)日:2019-04-30

    申请号:US15495714

    申请日:2017-04-24

    发明人: Dayong Zhou Yang Lu

    摘要: The handling of disturbances to audio signals may be improved with an adaptive noise cancellation (ANC) system that performs frequency-domain adaption. The ANC systems may be configured to determine if a disturbance is present at a first frequency in the second input signal received from the reference microphone. The ANC systems may update an algorithm of an adaptive filter based, at least in part, on the first input signal, the second input signal, and a feedback signal that is based on an output of the adaptive filter by changing parameters of the algorithm such that the adaptive filter adapts around the first frequency differently than other frequencies when the disturbance is present.

    Tone and howl suppression in an ANC system

    公开(公告)号:US10249283B2

    公开(公告)日:2019-04-02

    申请号:US15669647

    申请日:2017-08-04

    摘要: The handling of disturbances to audio signals may be improved with an adaptive noise cancellation (ANC) system that performs tone suppression and howl suppression in a collaborative manner. Such ANC systems may be configured to detect a first tone in an input signal at a first tone frequency and extract the detected first tone from the input signal. The ANC systems may also be configured to adaptively filter the extracted first tone to generate a second tone that has a magnitude that is approximately equal to a magnitude of the extracted first tone and a phase that is approximately opposite the phase of the extracted first tone. The ANC systems may be further configured to add the second tone to an intermediate signal that is based, at least in part, on the input signal to generate the output signal.

    TONE AND HOWL SUPPRESSION IN AN ANC SYSTEM
    4.
    发明申请

    公开(公告)号:US20190043467A1

    公开(公告)日:2019-02-07

    申请号:US15669647

    申请日:2017-08-04

    摘要: The handling of disturbances to audio signals may be improved with an adaptive noise cancellation (ANC) system that performs tone suppression and howl suppression in a collaborative manner. Such ANC systems may be configured to detect a first tone in an input signal at a first tone frequency and extract the detected first tone from the input signal. The ANC systems may also be configured to adaptively filter the extracted first tone to generate a second tone that has a magnitude that is approximately equal to a magnitude of the extracted first tone and a phase that is approximately opposite the phase of the extracted first tone. The ANC systems may be further configured to add the second tone to an intermediate signal that is based, at least in part, on the input signal to generate the output signal.

    FEEDBACK ADAPTIVE NOISE CANCELLATION (ANC) CONTROLLER AND METHOD HAVING A FEEDBACK RESPONSE PARTIALLY PROVIDED BY A FIXED-RESPONSE FILTER
    8.
    发明申请
    FEEDBACK ADAPTIVE NOISE CANCELLATION (ANC) CONTROLLER AND METHOD HAVING A FEEDBACK RESPONSE PARTIALLY PROVIDED BY A FIXED-RESPONSE FILTER 有权
    反馈自适应噪声消除(ANC)控制器和方法具有部分由固定响应滤波器提供的反馈响应

    公开(公告)号:US20170053639A1

    公开(公告)日:2017-02-23

    申请号:US15241375

    申请日:2016-08-19

    IPC分类号: G10K11/178

    摘要: A controller for an adaptive noise canceling (ANC) system simplifies the design of a stable control response by making the ANC gain of the system independent of a secondary path extending from a transducer of the ANC system to a sensor of the ANC system that measures the ambient noise. The controller includes a fixed filter having a predetermined fixed response, and a variable filter coupled together. The variable response filter compensates for variations of a transfer function of a secondary path that includes at least a path from a transducer of the ANC system to a sensor of the ANC system, so that the ANC gain is independent of the variations in the transfer function of the secondary path.

    摘要翻译: 用于自适应噪声消除(ANC)系统的控制器通过使系统的ANC增益与从ANC系统的换能器延伸到ANC系统的传感器的次级路径无关,从而简化了稳定控制响应的设计, 环境噪音 控制器包括具有预定固定响应的固定滤波器和耦合在一起的可变滤波器。 可变响应滤波器补偿二次路径的传递函数的变化,其包括至少从ANC系统的换能器到ANC系统的传感器的路径,使得ANC增益独立于传递函数的变化 的次要路径。