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    Low power analog-to-digital converter for sensing geophone signals
    6.
    发明授权
    Low power analog-to-digital converter for sensing geophone signals 有权
    用于感应地震检波器信号的低功耗模数转换器

    公开(公告)号：US09335429B2

    公开(公告)日：2016-05-10

    申请号：US14636417

    申请日：2015-03-03

    Applicant: Cirrus Logic, Inc.

    Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshapalli ,  Dale Brummel ,  Stephen T. Hodapp

    IPC: H03M3/00 ,  G01V1/18

    CPC classification number: G01V1/181 ,  H03M3/424 ,  H03M3/45 ,  H03M3/454

    Abstract: A low power analog-to-digital converter configured to sense sensor signals may include a loop filter and a feedback digital-to-analog converter. The loop filter may have a loop filter input configured to receive an input current signal from a sensor and generate an output signal responsive to the input current signal. The feedback digital-to-analog converter may have a feedback output configured to generate a current-mode or charge-mode feedback output signal responsive to the output signal, the feedback output coupled to the loop filter input in order to combine the input current signal and the feedback output signal at the input.

    Abstract translation: 被配置为感测传感器信号的低功率模数转换器可以包括环路滤波器和反馈数模转换器。 环路滤波器可以具有环路滤波器输入，其被配置为从传感器接收输入电流信号，并响应于输入电流信号产生输出信号。 反馈数模转换器可以具有被配置为响应于输出信号产生电流模式或电荷模式反馈输出信号的反馈输出，反馈输出耦合到环路滤波器输入，以便组合输入电流信号 和输入端的反馈输出信号。

    Use of microphone capacitance as a switched capacitor in an input network of a delta-sigma modulator
    7.
    发明授权
    Use of microphone capacitance as a switched capacitor in an input network of a delta-sigma modulator 有权
    在Δ-Σ调制器的输入网络中使用麦克风电容作为开关电容

    公开(公告)号：US09332345B1

    公开(公告)日：2016-05-03

    申请号：US14248035

    申请日：2014-04-08

    Applicant: Cirrus Logic, Inc.

    Inventor： John L. Melanson ,  John C. Tucker

    IPC: H04R3/00 ,  H03M3/00 ,  H04R19/04

    CPC classification number: H04R3/02 ,  H03F1/26 ,  H03F3/16 ,  H03F2200/372 ,  H03M3/00 ,  H03M3/39 ,  H03M3/424 ,  H03M3/458 ,  H03M3/50 ,  H03M7/3026 ,  H03M7/3028 ,  H04R3/00 ,  H04R3/002 ,  H04R3/007 ,  H04R19/04 ,  H04R29/001

    Abstract: In accordance with embodiments of the present disclosure, a method and apparatus for providing a digitized microphone signal to a digital processing device may include an analog signal path portion, a digital signal path portion, and a control circuit. The analog signal path portion may have an audio input configured to receive an analog input signal indicative of audio sounds incident upon an audio transducer. The digital signal path portion may have an analog-to-digital converter for converting the analog microphone signal to the digitized microphone signal. The control circuit may be configured to control a magnitude of the analog input signal or a derivative thereof in order to reduce audio distortion occurring in either or both of the analog signal path portion and the digital signal path portion.

    Abstract translation: 根据本公开的实施例，用于向数字处理设备提供数字化麦克风信号的方法和设备可以包括模拟信号路径部分，数字信号路径部分和控制电路。 模拟信号路径部分可以具有被配置为接收指示入射到音频换能器上的音频声音的模拟输入信号的音频输入。 数字信号路径部分可以具有用于将模拟麦克风信号转换为数字化麦克风信号的模数转换器。 控制电路可以被配置为控制模拟输入信号或其导数的幅度，以便减少在模拟信号路径部分和数字信号路径部分中的任一个或两者中发生的音频失真。

    SYSTEMS AND METHODS FOR REDUCTION OF AUDIO ARTIFACTS IN AN AUDIO SYSTEM WITH DYNAMIC RANGE ENHANCEMENT
    8.
    发明申请
    SYSTEMS AND METHODS FOR REDUCTION OF AUDIO ARTIFACTS IN AN AUDIO SYSTEM WITH DYNAMIC RANGE ENHANCEMENT 有权
    在动态范围增强的音频系统中减少音频作品的系统和方法

    公开(公告)号：US20160080865A1

    公开(公告)日：2016-03-17

    申请号：US14507372

    申请日：2014-10-06

    Applicant: Cirrus Logic, Inc.

    Inventor： Ku He ,  Tejasvi Das ,  John L. Melanson

    IPC: H04R3/04 ,  H03G3/00

    CPC classification number: H04R3/00 ,  H03G3/00 ,  H03G3/20 ,  H03G3/3005 ,  H03G3/3089 ,  H04R3/04 ,  H04R2430/00

    Abstract: In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.

    Abstract translation: 根据本公开的实施例，控制电路可以被配置为响应于在具有模拟路径部分的信号路径的增益模式和数字信号路径部分之间切换的指示，切换模拟的可选择的模拟增益 在第一模拟增益和第二模拟增益之​​间的路径部分，在第一数字增益和第二数字增益之间切换数字信号路径部分的可选数字增益，其中第一模拟增益和第一数字增益的乘积近似 等于第二模拟增益和第二数字增益的乘积，并且作为信号路径的增益模式之间的切换的结果，控制信号路径的模拟响应以减少存在于输出信号中的音频伪像的出现。 信号路径可以具有模拟路径部分和数字信号路径部分。 数字部分可以具有可选择的数字控制的增益，并且可以被配置为将数字音频输入信号转换成符合可选数字控制的增益的模拟输入信号，数字信号路径部分包括调制器，包括前向路径和 反馈路径。 正向路径可以包括环路滤波器，用于响应于数字音频输入信号和反馈信号产生经滤波的信号，响应于经滤波的信号产生量化信号的量化器，以及第一增益元件，被配置为将可选择的数字 - 控制增益到正向路径内的信号。 反馈路径可以被配置为响应于量化信号产生反馈信号，反馈路径包括具有与可选数字控制增益成反比的增益的第二增益元件。

    ENERGY-EFFICIENT PERSONAL AUDIO DEVICE OUTPUT STAGE WITH SIGNAL POLARITY-DEPENDENT POWER SUPPLY UPDATE RATE
    9.
    发明申请
    ENERGY-EFFICIENT PERSONAL AUDIO DEVICE OUTPUT STAGE WITH SIGNAL POLARITY-DEPENDENT POWER SUPPLY UPDATE RATE 审中-公开
    具有信号极度相关电源更新速率的能源效率高的个人音频设备输出级

    公开(公告)号：US20160056777A1

    公开(公告)日：2016-02-25

    申请号：US14929974

    申请日：2015-11-02

    Applicant: Cirrus Logic, Inc.

    Inventor： Bharath Kumar Thandri ,  John L. Melanson

    IPC: H03F3/183 ,  H03F3/217 ,  H02M3/07 ,  H03F1/02

    CPC classification number: H03F3/183 ,  H02M3/07 ,  H02M2003/071 ,  H02M2003/072 ,  H03F1/0211 ,  H03F1/0227 ,  H03F3/185 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/102

    Abstract: A charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide a first voltage or a second voltage in accordance with the select input. The charge pump power supply may have a signal polarity input for indicating a polarity of an output audio signal. Switches for switching one or more capacitors providing a first polarity voltage in a then-current operating mode may be configured to switch at a greater frequency than switches for switching one or more capacitors providing a second polarity voltage responsive to the signal polarity input indicating a positive polarity of the output audio signal. Switches for switching one or more capacitors providing the first polarity voltage in a then-current operating mode are configured to switch at a lesser frequency than switches for switching one or more capacitors providing the second polarity voltage responsive to the signal polarity input indicating a negative polarity of the output audio signal.

    Abstract translation: 电荷泵电源可以包括多个电容器和用于切换电容器以根据选择输入提供第一电压或第二电压的开关电路。 电荷泵电源可以具有用于指示输出音频信号的极性的信号极性输入。 用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关可以被配置为以比用于切换提供第二极性电压的一个或多个电容器的开关更大的频率切换，所述电容器响应于指示正的 输出音频信号的极性。 用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关被配置为响应于指示负极性的信号极性输入而以比用于切换提供第二极性电压的一个或多个电容器的开关更小的频率 的输出音频信号。

    Coordinated dimmer compatibility functions
    10.
    发明授权
    Coordinated dimmer compatibility functions 有权

    公开(公告)号：US09240725B2

    公开(公告)日：2016-01-19

    申请号：US14102809

    申请日：2013-12-11

    Applicant: Cirrus Logic, Inc.

    Inventor： John L. Melanson ,  Eric J. King

    IPC: G05F1/00 ,  H02M3/335 ,  H02M1/36 ,  H05B33/08 ,  H02M1/00

    CPC classification number: H02M7/06 ,  H02M1/36 ,  H02M3/33507 ,  H02M2001/0006 ,  H05B33/0815 ,  Y02B20/346 ,  Y10T307/352 ,  Y10T307/50

    Abstract: A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii), control of switch mode power conversion and (iii) an inactive state to, for example, to allow a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), and (iii), the controller controls a power converter system that is compatible with a triac-based dimmer. In at least one embodiment, the controller coordinates functions (i), (ii), and (iii) in response to a particular dimming level indicated by a phase cut, rectified input voltage supplied to the power converter system.

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