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。

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。

公开(公告)号：US09319784B2

公开(公告)日：2016-04-19

申请号：US14252235

申请日：2014-04-14

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Ning Li

IPC: A61F11/06 ,  H04R3/00 ,  H04R1/08 ,  G10K11/178 ,  H04R1/10

CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3049 ,  G10K2210/3056 ,  H04R1/08 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01

Abstract: A personal audio device includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Noise is injected so that the adaptation of the secondary path estimating adaptive filter can be maintained, irrespective of the presence and amplitude of the source audio. The noise is shaped by a noise shaping filter that has a response controlled in conformity with at least one parameter of the secondary path response.

Abstract translation: 个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以引起环境音频声音的消除。 在扬声器附近还提供误差麦克风以提供指示噪声消除的有效性的误差信号。 二次路径估计自适应滤波器用于估计通过换能器的噪声消除电路的电声路径，从而可以从误差信号中去除源音频。 噪声被注入，使得可以维持二次路径估计自适应滤波器的适应，而不管源音频的存在和幅度如何。 噪声通过噪声整形滤波器成形，该滤波器的响应受到与次要路径响应的至少一个参数相一致的控制。

公开(公告)号：US09300275B1

公开(公告)日：2016-03-29

申请号：US14339879

申请日：2014-07-24

Applicant: Cirrus Logic, Inc.

Inventor： Bhoodev Kumar ,  Saurabh Singh ,  Lei Zhu

IPC: H03K3/00 ,  H03K3/012 ,  G06F17/50

CPC classification number: G06F17/505 ,  G01R31/318541 ,  H03K3/012

Abstract: In accordance with embodiments of the present disclosure, a multi-bit pulsed latch circuit for an integrated circuit design system may include a pulse generator and a plurality of latches. The pulse generator may be configured to generate pulses. The plurality of latches may operate as storage elements and are coupled to the pulse generator in a manner so that the multi-bit pulsed latch circuit provides functionality of at least two flip flop elements, wherein the multi-bit pulsed latch circuit can replace the at least two flip flop elements that normally would be used by the integrated circuit design system.

Abstract translation: 根据本公开的实施例，用于集成电路设计系统的多位脉冲锁存电路可以包括脉冲发生器和多个锁存器。 脉冲发生器可以被配置为产生脉冲。 多个锁存器可以作为存储元件工作，并且以这样的方式耦合到脉冲发生器，使得多位脉冲锁存电路提供至少两个触发器元件的功能，其中多位脉冲锁存电路可以代替at 通常将由集成电路设计系统使用的至少两个触发器元件。

公开(公告)号：US09294836B2

公开(公告)日：2016-03-22

申请号：US13952221

申请日：2013-07-26

Applicant: Cirrus Logic, Inc.

Inventor： Dayong Zhou ,  Yang Lu ,  Ning Li

IPC: G10K11/16 ,  H04R3/00 ,  G10K11/178

CPC classification number: H04R3/002 ,  G10K11/16 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17833 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3035 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/509

Abstract: In accordance with methods and systems of the present disclosure, a processing circuit may implement at least one of: a feedback filter having a response that generates at least a portion of an anti-noise component from a playback corrected error, the playback corrected error based on a difference between the error microphone signal and a secondary path estimate; and a feedforward filter having a response that generates at least a portion of the anti-noise signal from a reference microphone signal. The processing circuit may also implement a secondary path estimate filter configured to model an electro-acoustic path of a source audio signal and have a response that generates a secondary path estimate from the source audio signal and a secondary path estimate performance monitor for monitoring performance of the secondary path estimate filter in modeling the electro-acoustic path.

Abstract translation: 根据本公开的方法和系统，处理电路可以实现以下至少一个：具有响应的反馈滤波器，该响应从回放校正误差产生抗噪声分量的至少一部分，基于回放校正误差 在误差麦克风信号和次路径估计之间的差异; 以及前馈滤波器，其具有从参考麦克风信号产生抗噪声信号的至少一部分的响应。 处理电路还可以实现二次路径估计滤波器，其被配置为对源音频信号的电声路径进行建模，并且具有从源音频信号生成次路径估计的响应，以及用于监视源音频信号的次级路径估计性能监视器 二次路径估计滤波器对电声路径进行建模。

公开(公告)号：US09287839B1

公开(公告)日：2016-03-15

申请号：US14056108

申请日：2013-10-17

Applicant: Cirrus Logic, Inc.

Inventor： Christophe Jean-Francois Amadi ,  Jason Lee Wardlaw ,  Emmanuel A. Marchais ,  Dylan Alexander Hester ,  Daniel John Allen ,  John Christopher Tucker

IPC: H03F3/45 ,  H03F1/34 ,  H03F1/02 ,  H03G3/32

CPC classification number: H03F3/45659 ,  H03F1/02 ,  H03F1/26 ,  H03F1/34 ,  H03F3/187 ,  H03F3/45475 ,  H03F3/45753 ,  H03F2200/03 ,  H03F2203/45138 ,  H03F2203/45212 ,  H03F2203/45526 ,  H03F2203/45586 ,  H03G3/32

Abstract: A DC servo loop may track DC offset changes of an input signal and apply feedback to amplifiers to adjust a DC offset of the input signal. The DC servo loop may include digital loop tracking and analog loop tracking components. The digital loop tracking components may track small changes in the DC offset. When the DC offset exceeds a certain threshold, analog loop tracking may be activated to apply feedback to the amplifiers to adjust the DC offset. The adjustments to the DC offset may be delayed until an amplitude of the input signal exceeds a threshold to reduce contribution to noise in the input signal.

Abstract translation: DC伺服环路可以跟踪输入信号的DC偏移变化，并将反馈应用于放大器以调整输入信号的直流偏移。 DC伺服环路可以包括数字环路跟踪和模拟环路跟踪组件。 数字环路跟踪组件可以跟踪DC偏移的小变化。 当DC偏移超过某个阈值时，可以激活模拟环路跟踪以将反馈应用于放大器以调整DC偏移。 DC偏移的调整可能被延迟，直到输入信号的幅度超过阈值以减小输入信号中对噪声的贡献。

公开(公告)号：US09258001B1

公开(公告)日：2016-02-09

申请号：US14016972

申请日：2013-09-03

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  Alvin C. Storvik

IPC: H03L7/087 ,  H03L7/093 ,  H03L7/14 ,  H03L7/10 ,  H03L7/107

CPC classification number: H03L7/148 ,  H03L7/087 ,  H03L7/0891 ,  H03L7/093 ,  H03L7/103 ,  H03L7/105 ,  H03L7/1075 ,  H03L7/146 ,  H03L7/18 ,  H03L7/22 ,  H03L2207/06

Abstract: An oscillator of a phase-locked loop (PLL) or frequency-locked loop (FLL) may include two inputs. The two inputs may include a first analog input and a second digital input. The second digital input may receive a digital signal setting a desired output clock frequency of the oscillator and/or indicating an approximate frequency of frequency range for output by the oscillator. The first analog input may receive a voltage representative of a desired frequency for the output clock frequency of the PLL or FLL to fine-tune the output frequency from the approximate frequency set by the second digital input. The first analog input may be generated from a master clock input signal. When the master clock input signal disappears, the second digital signal controls the output frequency of the oscillator to allow redundant operation of the PLL or FLL even when no master clock input signal is present.

Abstract translation: 锁相环（PLL）或锁频环（FLL）的振荡器可以包括两个输入。 两个输入可以包括第一模拟输入和第二数字输入。 第二数字输入可以接收设置振荡器的期望输出时钟频率的数字信号和/或指示振荡器输出的频率范围的近似频率。 第一模拟输入可以接收代表PLL或FLL的输出时钟频率的期望频率的电压，以从由第二数字输入设置的近似频率微调输出频率。 第一模拟输入可以从主时钟输入信号产生。 当主时钟输入信号消失时，即使没有主时钟输入信号，第二数字信号控制振荡器的输出频率，以允许PLL或FLL的冗余操作。

公开(公告)号：US09215532B2

公开(公告)日：2015-12-15

申请号：US13915780

申请日：2013-06-12

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric Swanson

IPC: H04R9/08 ,  H04R19/04 ,  H04R1/04 ,  H04W52/02 ,  H04R3/00 ,  H04R3/04 ,  H04R19/02 ,  H04M1/00 ,  H04R1/10

CPC classification number: H04R3/005 ,  H04R1/04 ,  H04R1/1041 ,  H04R3/04 ,  H04R19/02 ,  H04R19/04 ,  H04R2400/01 ,  H04R2499/11 ,  H04W52/0251 ,  H04W52/0254 ,  Y02D70/00 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164 ,  Y02D70/168

Abstract: In accordance with methods and systems of the present disclosure, a mobile device may include an enclosure adapted such that the enclosure is readily transported by a user of the mobile device, a speaker associated with the enclosure for generating sound, and a controller within the enclosure, communicatively coupled to the speaker. The controller may be configured to receive a signal from the speaker, the signal induced at least in part by sound incident on the speaker other than sound generated by the speaker and process the signal.

公开(公告)号：US09214948B2

公开(公告)日：2015-12-15

申请号：US14255912

申请日：2014-04-17

Applicant: Cirrus Logic, Inc.

Inventor： Ku He ,  Xin Zhao ,  Xiaofan Fei

IPC: H03M1/12 ,  H03M1/00 ,  H03M1/36

CPC classification number: H03M1/002 ,  H03M1/0809 ,  H03M1/181 ,  H03M1/36

Abstract: A comparator tracking scheme for an analog-to-digital converter (ADC) may implement a dynamic window size by varying, over time, a number of comparators powered up to convert an analog input signal to a digital output signal. A comparator-tracking scheme may be implemented, for example, in a controller coupled to a plurality of comparators in an ADC. For example, the controller may determine a window size for the ADC and determine a window position for the ADC. The controller may then activate comparators of the ADC within a window centered at the window position and having a width of the window size. The controller may determine a window size by analyzing an output of a filter. When the filter output indicates a rapidly changing analog input signal, the controller may dynamically increase a window size of the ADC, which may increase a number of comparators powered on.

Abstract translation: 用于模数转换器（ADC）的比较器跟踪方案可以通过随时间变化多个比较器供电以将模拟输入信号转换为数字输出信号来实现动态窗口尺寸。 比较器跟踪方案可以例如在耦合到ADC中的多个比较器的控制器中实现。 例如，控制器可以确定ADC的窗口大小并确定ADC的窗口位置。 然后，控制器可以在以窗口位置为中心并且具有窗口大小的宽度的窗口内激活ADC的比较器。 控制器可以通过分析滤波器的输出来确定窗口大小。 当滤波器输出指示快速变化的模拟输入信号时，控制器可以动态增加ADC的窗口大小，这可能会增加多个比较器上电。

公开(公告)号：US20150340955A1

公开(公告)日：2015-11-26

申请号：US14701791

申请日：2015-05-01

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Zhaohui He

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/33523 ,  H02M2001/0003 ,  H02M2001/007 ,  H05B33/0815 ,  Y02B20/346

Abstract: An electronic system includes a controller to provide at least dual-mode conduction control of a switching power converter. In at least one embodiment, the controller is capable to control transitions between discontinuous conduction mode (DCM) and critical conduction mode (CRM) of the switching power converter using a measured switching time parameter having a value corresponding with an approximately peak voltage of a time-varying supply voltage supplied to the switching power converter. In at least one embodiment, the controller dynamically compensates for changing parameters of the electronic system by dynamically determining a minimum non-conductive time of the control switch of the switching power converter using the measured switching time parameter value at approximately the peak of the supply voltage of the supply voltage.

Abstract translation: 电子系统包括控制器，用于至少提供开关功率转换器的双模式导通控制。 在至少一个实施例中，控制器能够使用具有对应于一个时间的近似峰值电压的值的测量的开关时间参数来控制开关功率转换器的不连续导通模式（DCM）和临界导通模式（CRM）之间的转换 - 提供给开关电源转换器的电源电压。 在至少一个实施例中，控制器通过动态地确定开关功率转换器的控制开关的最小非导通时间，在大约电源电压的峰值处使用测量的开关时间参数值来动态地补偿电子系统的变化参数 的电源电压。