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91. 发明授权

US09503112B1 Non-linearity cancellation in a dual-path ADC 有权
标题翻译：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
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Ramin Zanbaghi , Yousof Mortazavi , Aaron Brennan , John L. Melanson
IPC分类号： H03M1/06 , H03M1/10
CPC分类号： H03M1/0602 , G10L19/00 , H03M1/1004 , H03M1/1038 , H03M1/1042 , H03M1/188 , H03M1/60
摘要： 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.
摘要翻译：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。

92. 发明授权

US09479868B2 Systems and methods for detection of load impedance of a transducer device coupled to an audio device 有权
标题翻译：用于检测耦合到音频装置的换能器装置的负载阻抗的系统和方法
公开(公告)号：US09479868B2
公开(公告)日：2016-10-25
申请号：US14036136
申请日：2013-09-25
申请人： Cirrus Logic, Inc.
发明人： Anand Ilango , Daniel John Allen , Aniruddha Satoskar
IPC分类号： H04R3/00 , H04R29/00 , G10K11/178 , H03F1/02 , H03F3/181 , H03F3/52 , H03F3/185 , H03F1/52 , H03F3/183 , H04R5/04
CPC分类号： H04R3/007 , G10K11/17854 , G10K11/17881 , G10K11/17885 , G10K2210/1081 , G10K2210/30232 , G10K2210/3045 , G10K2210/3049 , H03F1/0211 , H03F1/0227 , H03F1/52 , H03F3/181 , H03F3/183 , H03F3/185 , H03F3/52 , H03F2200/03 , H03F2200/462 , H03F2200/471 , H04R5/04 , H04R29/001 , H04R2420/05
摘要： In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.
摘要翻译：根据本公开的系统和方法，音频设备可以包括电端子，音频电路和换能器负载检测电路。电气终端可将传感器装置耦合到音频装置。音频电路可以产生模拟音频信号，其中模拟音频信号耦合到电气端子。当换能器装置从音频装置耦合到音频装置时，传感器负载检测电路可以检测换能器装置的负载阻抗，电气终端。

93. 发明授权

US09473087B2 Class-D amplifier circuits 有权
标题翻译： D类放大器电路
公开(公告)号：US09473087B2
公开(公告)日：2016-10-18
申请号：US14521191
申请日：2014-10-22
申请人： Wolfson Microelectronics Ltd.
发明人： John Paul Lesso , Toru Ido
IPC分类号： H03F3/38 , H03F3/217 , H03F1/02
CPC分类号： H03F3/2171 , H03F1/0211 , H03F3/187 , H03F3/217 , H03F2200/165 , H03F2200/171 , H03F2200/333 , H03F2200/351 , H03G1/0088
摘要： Methods and apparatus for Class-D amplifier circuits with improved power efficiency. The circuit has an output stage with at least first and second switches and a modulator that receives an input signal to be amplified, SIN, and a first clock signal fSW. The modulator controls the duty cycles of the first and second switches, within a switching cycle based on the input signal, wherein the switching cycle has a switching frequency based on the first clock signal. A frequency controller controls the frequency of the first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude. A lower switching frequency can be tolerated at low signal amplitudes and varying the switching frequency in this way thus maintains stability whilst reducing switching power losses.
摘要翻译：具有提高功率效率的D类放大器电路的方法和装置。电路具有至少具有第一和第二开关的输出级和接收要被放大的输入信号SIN和第一时钟信号fSW的调制器。调制器基于输入信号在开关周期内控制第一和第二开关的占空比，其中开关周期具有基于第一时钟信号的开关频率。频率控制器响应于输入信号的幅度的指示来控制第一时钟信号的频率，以便提供第一输入信号幅度的第一开关频率和在第二输入信号幅度下的第二，较低开关频率，输入信号幅度。在低信号幅度下可以容忍较低的开关频率，并且以这种方式改变开关频率，从而在降低开关功率损耗的同时保持稳定性。

94. 发明授权

US09467778B2 Beamforming a digital microphone array on a common platform 有权
标题翻译：在一个通用平台上成像一个数字麦克风阵列
公开(公告)号：US09467778B2
公开(公告)日：2016-10-11
申请号：US13844802
申请日：2013-03-16
申请人： Cirrus Logic, Inc.
发明人： Eric J. Swanson , Ed Schneider
IPC分类号： H04R3/00
CPC分类号： H04R3/005
摘要： An interface for an array of digital microphones in an electronic device may include a head-end chip coupled to the digital microphones through a bus. The bus may be shared by each microphone of the array of microphones and be multiplexed to allow transmission of data from the microphones to the head-end chip and transmission of power from the head-end chip to the array of digital microphones. The head-end chip may perform signal processing on receive data from the array of digital microphones to create beamforming arrays. The array of microphones may include microphones with different characteristics to improve performance of the array of microphones.
摘要翻译：用于电子设备中的数字麦克风阵列的接口可以包括通过总线耦合到数字麦克风的头端芯片。总线可以由麦克风阵列的每个麦克风共享，并被复用以允许数据从麦克风传输到头端芯片，并将功率从头端芯片传输到数字麦克风阵列。前端芯片可以对来自数字麦克风阵列的接收数据执行信号处理，以创建波束成形阵列。麦克风阵列可以包括具有不同特性的麦克风，以改善麦克风阵列的性能。

95. 发明授权

US09377792B2 Chip level integration of a boosted class-D amplifier and integrated LED flash driver 有权
标题翻译：升压型D类放大器和集成LED闪光驱动器的芯片级集成
公开(公告)号：US09377792B2
公开(公告)日：2016-06-28
申请号：US13548963
申请日：2012-07-13
申请人： Lingli Zhang , Michael Pate
发明人： Lingli Zhang , Michael Pate
IPC分类号： G05F1/10 , H03F3/217 , H05B33/08 , H02M3/156
CPC分类号： G05F1/10 , H02M3/156 , H03F3/217 , H05B33/0842 , Y10T307/438
摘要： A single integrated circuit includes a single boost converter, a first circuit, a second circuit, and a controller. The single boost converter supplies power to the first and second circuits. The controller receives an operational mode signal and in response to the operational mode signal, drives the single boost converter to respectively provide power to the first and second circuits. When the first and second circuits are simultaneously active, the controller manages an operation of the first circuit so that proper operation of the second circuit is maintained. The first circuit may be an LED flash driver, and the second circuit may be an audio amplifier, such as a Class-D audio amplifier. The controller manages an operation of the audio amplifier so that a sufficient amount of current is supplied to the LED flash driver for proper operation of the LED flash driver.
摘要翻译：单个集成电路包括单个升压转换器，第一电路，第二电路和控制器。单个升压转换器为第一和第二电路供电。控制器接收操作模式信号并且响应于操作模式信号，驱动单个升压转换器以分别向第一和第二电路提供电力。当第一和第二电路同时有效时，控制器管理第一电路的操作，从而保持第二电路的正常操作。第一电路可以是LED闪光驱动器，并且第二电路可以是诸如D类音频放大器的音频放大器。控制器管理音频放大器的操作，使得足够量的电流被提供给LED闪光灯驱动器以适当地操作LED闪光灯驱动器。

96. 发明授权

US09363610B2 MEMS process and device 有权
标题翻译： MEMS工艺和器件
公开(公告)号：US09363610B2
公开(公告)日：2016-06-07
申请号：US14452067
申请日：2014-08-05
申请人： Wolfson Microelectronics plc
发明人： Anthony Bernard Traynor , Richard Ian Laming , Tsjerk H. Hoekstra
IPC分类号： H01L29/84 , H04R23/00 , B81B3/00 , H04R19/04 , H01L27/00 , H04R19/00 , H04R31/00
CPC分类号： H04R19/04 , B81B3/0021 , B81B3/0072 , B81B3/0094 , B81B2201/00 , B81B2201/0235 , B81B2201/0257 , B81B2201/0264 , H01L27/00 , H04R19/00 , H04R19/005 , H04R23/00 , H04R31/00 , H04R2499/11
摘要： A method of fabricating a micro-electrical-mechanical system (MEMS) transducer comprises the steps of forming a membrane on a substrate, and forming a back-volume in the substrate. The step of forming a back-volume in the substrate comprises the steps of forming a first back-volume portion and a second back-volume portion, the first back-volume portion being separated from the second back-volume portion by a step in a sidewall of the back-volume. The cross-sectional area of the second back-volume portion can be made greater than the cross-sectional area of the membrane, thereby enabling the back-volume to be increased without being constrained by the cross-sectional area of the membrane. The back-volume may comprise a third back-volume portion. The third back-volume portion enables the effective diameter of the membrane to be formed more accurately.
摘要翻译：制造微机电系统（MEMS）换能器的方法包括以下步骤：在衬底上形成膜，并在衬底中形成后体积。在基板中形成后部体积的步骤包括以下步骤：形成第一后部体积部分和第二背部体积部分，第一后部体积部分与第二背部体积部分分离，背部体积的侧壁。第二后部容积部分的横截面面积可以大于膜的横截面面积，从而能够增加后部体积，而不受膜的横截面面积的约束。背部容积可以包括第三后部体积部分。第三后部体积部分能够更准确地形成膜的有效直径。

97. 发明授权

US09357300B2 Systems and methods for protecting a speaker 有权
公开(公告)号：US09357300B2
公开(公告)日：2016-05-31
申请号：US14864639
申请日：2015-09-24
申请人： Cirrus Logic, Inc.
发明人： Jie Su
IPC分类号： H04R3/00
CPC分类号： H04R3/007
摘要： In accordance with embodiments of the present disclosure, systems and methods may include a controller configured to be coupled to an audio speaker, wherein the controller receives one or more signals indicative of one or more operating characteristics of the audio speaker and compares the one or more operating characteristics to one or more speaker protection thresholds, and based on the comparison, processes an audio input signal to generate an audio output signal communicated from the controller to the audio speaker, further wherein the one or more speaker protection thresholds are based on offline reliability testing of one or more audio speakers similar to the audio speaker and the controller generates one or more modeled parameters for the audio speaker and modifies the one or more speaker protection thresholds based on the one or more modeled parameters.

98. 发明授权

US09335429B2 Low power analog-to-digital converter for sensing geophone signals 有权
标题翻译：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
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , Rahul Singh , Prashanth Drakshapalli , Dale Brummel , Stephen T. Hodapp
IPC分类号： H03M3/00 , G01V1/18
CPC分类号： G01V1/181 , H03M3/424 , H03M3/45 , H03M3/454
摘要： 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.
摘要翻译：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。

99. 发明授权

US09332345B1 Use of microphone capacitance as a switched capacitor in an input network of a delta-sigma modulator 有权
标题翻译：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
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , John C. Tucker
IPC分类号： H04R3/00 , H03M3/00 , H04R19/04
CPC分类号： 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
摘要： 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.
摘要翻译：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。

100. 发明授权

US09319784B2 Frequency-shaped noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices 有权
标题翻译：噪声消除个人音频设备中的二次路径自适应响应的基于频率的基于噪声的适应
公开(公告)号：US09319784B2
公开(公告)日：2016-04-19
申请号：US14252235
申请日：2014-04-14
申请人： Cirrus Logic, Inc.
发明人： Yang Lu , Dayong Zhou , Ning Li
IPC分类号： A61F11/06 , H04R3/00 , H04R1/08 , G10K11/178 , H04R1/10
CPC分类号： 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
摘要： 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.
摘要翻译：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。

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