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    TIMING ADJUSTMENT TO UNUSED UNIT-INTERVAL ON SHARED DATA BUS
    2.
    发明申请
    TIMING ADJUSTMENT TO UNUSED UNIT-INTERVAL ON SHARED DATA BUS 有权

    公开(公告)号：US20220245074A1

    公开(公告)日：2022-08-04

    申请号：US17166231

    申请日：2021-02-03

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Nitin Kwatra

    IPC: G06F13/20

    Abstract: Calibrating devices communicating on the shared bus can assist in reducing conflicts on the bus and the resulting loss of data. For example, the timing of transmission of data from one device to another device on the shared bus may be adjusted to compensate for delays on the shared bus. For example, the transmitting device may adjust transmission to an earlier time than the programmed time by an amount proportional to a known delay, such that the signal arrives at a receiving device at the programmed time. When the adjustment is not able to obtain a desired alignment or would cause conflicts on the shared data bus, the timing may be adjusted to delay the transmission, rather than advance the transmission, such that the adjusted transmission time results in the receipt of the signal at the receiving device in an unused time window after the programmed time.

    Active noise cancellation (ANC) system with selectable sample rates
    3.
    发明授权
    Active noise cancellation (ANC) system with selectable sample rates 有权

    公开(公告)号：US10810990B2

    公开(公告)日：2020-10-20

    申请号：US16261775

    申请日：2019-01-30

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Gabriel Vogel ,  Jeffrey Alderson ,  Ryan A. Hellman ,  Nitin Kwatra

    IPC: G10K11/178

    Abstract: An active noise cancellation (ANC) system including a selectable decimation rate decimator that receives an oversampled digital input and has an input that selects the decimation rate, a filter that receives an output of the decimator, and a selectable interpolation rate interpolator that receives an output of the filter and has an input that selects the interpolation rate. The selectable decimation rate decimator and the selectable interpolation rate interpolator operate to provide a selectable sample rate for the filter based on the selected decimation and interpolation rates. The filter may be an anti-noise filter, feedback filter, and/or a filter that models an acoustic transfer function of the ANC system. Rate selection may be static, or dynamically controlled based on battery or ambient noise level. A ratio of the decimation rate and the interpolation rate is fixed independent of the dynamically controlled decimation and interpolation rates.

    HYBRID FINITE IMPULSE RESPONSE FILTER
    7.
    发明申请
    HYBRID FINITE IMPULSE RESPONSE FILTER 审中-公开
    混合有限冲突响应滤波器

    公开(公告)号：US20160365084A1

    公开(公告)日：2016-12-15

    申请号：US14734418

    申请日：2015-06-09

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Jeffrey D. Alderson ,  John L. Melanson ,  Nitin Kwatra ,  Ryan A. Hellman

    IPC: G10K11/178

    CPC classification number: H03H17/0223 ,  G10K11/178 ,  G10K2210/3012 ,  G10K2210/3014 ,  G10K2210/3028 ,  G10K2210/3051 ,  G10K2210/3053 ,  G10K2210/509 ,  H03H17/0291 ,  H03H17/06 ,  H03H2017/0245

    Abstract: In accordance with embodiments of the present disclosure, a hybrid finite impulse response filter having a plurality of delay stages comprising a first filter portion and a second filter portion. In some embodiments, the first filter portion may be a high-rate filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal having a first sampling rate to generate a first intermediate output signal and the second portion may be a low-rate filter portion associated with a second portion of the plurality of delay stages and configured to filter a downsampled version of the input signal at a second sampling rate to generate a second intermediate output signal. In other embodiments, the first filter portion may include an analog filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal to generate a first intermediate output signal and the second filter portion may be a digital filter portion associated with a second portion of the plurality of delay stages and configured to filter the input signal.

    Abstract translation: 根据本公开的实施例，具有多个延迟级的混合有限脉冲响应滤波器包括第一滤波器部分和第二滤波器部分。 在一些实施例中，第一滤波器部分可以是与多个延迟级的第一部分相关联的高速率滤波器部分，并且被配置为对具有第一采样率的输入信号进行滤波以产生第一中间输出信号，并且第二部分 可以是与多个延迟级的第二部分相关联的低速率滤波器部分，并且被配置为以第二采样率对输入信号的下采样版本进行滤波以产生第二中间输出信号。 在其他实施例中，第一滤波器部分可以包括与多个延迟级的第一部分相关联的模拟滤波器部分，并且被配置为滤波输入信号以产生第一中间输出信号，并且第二滤波器部分可以是数字滤波器部分 与所述多个延迟级的第二部分相关联并且被配置为对所述输入信号进行滤波。

    Systems and methods for distributed adaptive noise cancellation
    8.
    发明授权
    Systems and methods for distributed adaptive noise cancellation 有权

    公开(公告)号：US10152960B2

    公开(公告)日：2018-12-11

    申请号：US15053792

    申请日：2016-02-25

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Jon D. Hendrix ,  Nitin Kwatra ,  Jeffrey D. Alderson

    IPC: G10K11/16 ,  G10K11/178 ,  H04R1/10 ,  H04M1/60

    Abstract: An integrated circuit may include an output for providing a signal to a transducer including both source audio for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer, a microphone input for receiving a microphone signal indicative of ambient sounds at the transducer, a link control input for receiving link control information of a communications link coupling the integrated circuit to the transducer and/or a microphone for generating the microphone signal, wherein the link control information includes a link quality metric of the communications link, and a processing circuit comprising a filter having a response that generates the anti-noise signal in conformity with the microphone signal to minimize the ambient sounds at the acoustic output of the transducer, wherein the processing circuit modifies generation of the anti-noise signal responsive to the link quality metric.

    Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device
    9.
    发明授权
    Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device 有权

    公开(公告)号：US10013966B2

    公开(公告)日：2018-07-03

    申请号：US15070457

    申请日：2016-03-15

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Nitin Kwatra ,  Jon D. Hendrix ,  John L. Melanson

    IPC: G10K11/178 ,  H04R3/12

    CPC classification number: G10K11/178 ,  G10K11/17879 ,  G10K11/17885 ,  G10K2210/1081 ,  H04R3/12 ,  H04R2205/022

    Abstract: In accordance with embodiments of the present disclosure, a processing circuit may implement an adaptive filter, a first signal injection portion which injects a first additional signal into a first frequency range content source audio signal, and a second signal injection portion which injects a second additional signal into a second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different. The adaptive filter may have a response that generates the antinoise signal from the reference microphone signal to reduce the presence of the ambient audio sounds at the acoustic output, wherein the response of the adaptive filter is shaped in conformity with the reference microphone signal and the error microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal, wherein the antinoise signal is combined with at least the first frequency range content source audio signal.

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