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    Non-linearity cancellation in a dual-path ADC
    31.
    发明授权
    Non-linearity cancellation in a dual-path ADC 有权
    双路ADC中的非线性消除

    公开(公告)号：US09503112B1

    公开(公告)日：2016-11-22

    申请号：US15154769

    申请日：2016-05-13

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Ramin Zanbaghi ,  Yousof Mortazavi ,  Aaron Brennan ,  John L. Melanson

    IPC: H03M1/06 ,  H03M1/10

    CPC classification number: H03M1/0602 ,  G10L19/00 ,  H03M1/1004 ,  H03M1/1038 ,  H03M1/1042 ,  H03M1/188 ,  H03M1/60

    Abstract: The overall performance of a dual-path ADC system may be improved by using a VCO-based ADC for small-amplitude signals and employing non-linear cancellation to remove nonlinearities in signals output by the VCO-based ADC. In particular, VCO-based dual-path ADC systems of this disclosure may be configured to receive a first digital signal from a first ADC and a second digital signal from a second ADC, wherein the second digital signal is more non-linear than the first digital signal. The dual-path systems may also be configured to determine one or more non-linear coefficients of the second digital signal based, at least in part, on processing of the first and second digital signals. The dual-path systems may be further configured to modify the second digital signal based, at least in part, on the determined one or more non-linear coefficients to generate a more linear second digital signal.

    Abstract translation: 通过使用基于VCO的ADC用于小振幅信号并采用非线性消除来消除由基于VCO的ADC输出的信号中的非线性，可以提高双路ADC系统的整体性能。 特别地，本公开的基于VCO的双路径ADC系统可以被配置为从第一ADC接收第一数字信号和从第二ADC接收第二数字信号，其中第二数字信号比第一ADC更非线性 数字信号。 至少部分地基于第一和第二数字信号的处理，双路系统还可以被配置为确定第二数字信号的一个或多个非线性系数。 至少部分地基于所确定的一个或多个非线性系数来修改第二数字信号以生成更线性的第二数字信号。

    ANALOG-TO-DIGITAL CONVERTER (ADC) DYNAMIC RANGE ENHANCEMENT FOR VOICE-ACTIVATED SYSTEMS
    32.
    发明申请
    ANALOG-TO-DIGITAL CONVERTER (ADC) DYNAMIC RANGE ENHANCEMENT FOR VOICE-ACTIVATED SYSTEMS 有权
    模拟数字转换器（ADC）语音激活系统的动态范围增强

    公开(公告)号：US20160314805A1

    公开(公告)日：2016-10-27

    申请号：US14696172

    申请日：2015-04-24

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Yousof Mortazavi ,  Ramin Zanbaghi ,  Aaron Brennan ,  John L. Melanson

    IPC: G10L25/78 ,  G10L15/34 ,  G10L21/034 ,  G10L15/22

    CPC classification number: G10L25/78 ,  G10L15/22 ,  G10L15/28 ,  G10L15/34 ,  G10L21/034 ,  G10L2015/223 ,  H03M1/185 ,  H03M3/49

    Abstract: The dynamic range and power efficiency of a voice-activated system may be improved by dynamically adjusting the configuration of the voice-activated system's input path. In one embodiment, a first portion of audio may be received through an input path of the voice-activated system having a first configuration. A characteristic of the first portion of audio may be determined and the input path may be adjusted to a second configuration based on the determined characteristic. A second portion of audio may then be received through the input path having the second configuration, and speech analysis may be performed on the second portion of audio.

    Abstract translation: 通过动态调整语音激活的系统的输入路径的配置，可以提高语音激活的系统的动态范围和功率效率。 在一个实施例中，可以通过具有第一配置的语音激活系统的输入路径来接收音频的第一部分。 可以确定音频的第一部分的特性，并且可以基于所确定的特性将输入路径调整到第二配置。 然后可以通过具有第二配置的输入路径接收第二部分音频，并且可以在音频的第二部分上执行语音分析。

    Clock signal transitioning for multi-mode audio processing systems
    33.
    发明授权
    Clock signal transitioning for multi-mode audio processing systems 有权

    公开(公告)号：US12261611B2

    公开(公告)日：2025-03-25

    申请号：US18353094

    申请日：2023-07-16

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Jianqi Chen ,  Jaiminkumar Mehta ,  Bhoodev Kumar ,  John L. Melanson

    IPC: H03L7/099 ,  H03L7/093

    Abstract: Methods and systems for determining clock signals for audio processing using different operating modes are provided. In one aspect, a transition control word is determined to transition from a first control word for a first operating mode to a second control word for the second operating mode. The transition control word may be used to process the received audio signal while transitioning between the operating modes. After the transition, the second control word may be used to process the received audio signal using the second operating mode. The transition control word may be used to transition between various aspects of the operating modes, including different frequencies or resolutions, control systems, power levels, and more.

    Nonlinear feedforward correction in a multilevel output system
    37.
    发明授权
    Nonlinear feedforward correction in a multilevel output system 有权

    公开(公告)号：US11906993B2

    公开(公告)日：2024-02-20

    申请号：US17960335

    申请日：2022-10-05

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： John L. Melanson ,  Thomas H. Hoff

    IPC: G05F1/46

    CPC classification number: G05F1/46

    Abstract: A feedforward correction block for use in a multi-level output system may include circuitry configured to determine an occurrence of a mode transition between operating modes of the multi-level output system, capture a loop filter output of a signal path of the multi-level output system occurring before and after the occurrence of the mode transition, and based on the transition and a change in the loop filter output responsive to the transition, determine a transition-specific compensation function to apply to a feedforward input signal of the signal path that is combined with the loop filter output.

    Driver circuitry
    38.
    发明授权
    Driver circuitry 有权

    公开(公告)号：US11779956B2

    公开(公告)日：2023-10-10

    申请号：US17505199

    申请日：2021-10-19

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Carl Lennart Ståhl ,  Emmanuel Marchais ,  Anthony Stephen Doy ,  John L. Melanson

    IPC: B06B1/02 ,  G06F3/01

    CPC classification number: B06B1/0207 ,  G06F3/016

    Abstract: Driver circuitry for driving an electromechanical load with a drive output signal, the driver circuitry comprising: a first control loop operable to control the drive output signal based on a drive input signal; and a second control loop operable to control the drive output signal based on a current flowing through and/or a voltage induced across the electromechanical load, wherein the second control loop is configured to have a lower latency than the first control loop, and to control the drive output signal to compensate for an impedance of the electromechanical load.

    Determination of gain of pulse width modulation amplifier system
    39.
    发明授权
    Determination of gain of pulse width modulation amplifier system 有权

    公开(公告)号：US11764741B1

    公开(公告)日：2023-09-19

    申请号：US17720936

    申请日：2022-04-14

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： John L. Melanson

    IPC: H03F3/217 ,  H03F1/02

    CPC classification number: H03F3/217 ,  H03F2200/03 ,  H03F2200/375

    Abstract: A switched mode amplifier system may include a switched mode amplifier having an amplifier input coupled to an output of an analog integrator and an amplifier output, include a feedback network coupled between the amplifier output and an input of the analog integrator, and a calibration system. The calibration system may be configured to force the input of the analog integrator to a fixed known input value, force the amplifier output to a fixed known duty cycle, measure an analog signal generated at the output of the analog integrator in response to forcing the input of the analog integrator to the fixed value, determine an offset of the switched mode amplifier system based on the analog signal, and correct for the offset.

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