公开(公告)号：US09742370B2

公开(公告)日：2017-08-22

申请号：US15350431

申请日：2016-11-14

Applicant: Cirrus Logic, Inc.

Inventor： Ullas Pazhayaveetil ,  Jeffrey May ,  Anu Chakravarty ,  Gautham D. Kamath ,  John C. Tucker ,  Christian Larsen

IPC: H03G3/00 ,  G01R27/26 ,  G01R21/06 ,  G06F1/32 ,  H02M3/158 ,  H03F3/187 ,  H03F3/217

CPC classification number: H02M3/158 ,  G01R21/06 ,  G01R27/2611 ,  G06F1/3203 ,  H02M3/156 ,  H03F3/187 ,  H03F3/2175 ,  H03G3/004

Abstract: Audio amplification may be improved by controlling an audio amplifier based on the audio signal being amplified. For example, when the audio signal level increases or decreases, a boost voltage provided to an audio amplifier by a boost converter may also be increased or decreased. In another example, when the audio signal level decrease below a certain level, the audio amplifier may be switched from amplifying the audio signal with a boost converter input to amplifying the audio signal with a low voltage input. Control of the audio amplifier may be implemented in a digital boost converter controller coupled to the boost converter and/or the audio amplifier.

公开(公告)号：US20150301077A1

公开(公告)日：2015-10-22

申请号：US14686834

申请日：2015-04-15

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Anindya Bhattacharya ,  Roderick D. Holley ,  Ruoxin Jiang ,  Stephen T. Hodapp ,  John C. Tucker

IPC: G01P15/125

CPC classification number: G01P15/125

Abstract: In accordance with embodiments of the present disclosure, an apparatus for measuring acceleration may include a spring-mounted mass, a positional encoder configured to measure a position of the spring-mounted mass and output one or more signals indicative of a sine and a cosine of the position, a driver to set and maintain an oscillation of the spring-mounted mass, and a decoder configured to process the one or more signals to calculate an acceleration of the spring-mounted mass.

Abstract translation: 根据本公开的实施例，用于测量加速度的装置可以包括弹簧安装的质量块，位置编码器被配置为测量弹簧安装质量块的位置，并输出一个或多个指示正弦和余弦的信号 所述位置，设置和保持所述弹簧安装的质量的振荡的驱动器，以及被配置为处理所述一个或多个信号以计算所述弹簧安装的质量块的加速度的解码器。

公开(公告)号：US20140301572A1

公开(公告)日：2014-10-09

申请号：US14247771

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H04R3/00

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 digital microphone system may include a microphone transducer and a digital processing system. The microphone transducer may be configured to generate an analog input signal indicative of audio sounds incident upon the microphone transducer. The digital processing system may be configured to convert the analog input signal into a first digital signal having a plurality (e.g., more than 3) of quantization levels, and in the digital domain, process the first digital signal to compress the first digital signal into a second digital signal having fewer quantization levels (e.g., +1, 0, −1) than that of the first digital signal.

Abstract translation: 根据本公开的实施例，数字麦克风系统可以包括麦克风换能器和数字处理系统。 麦克风换能器可以被配置为产生指示入射到麦克风换能器上的音频声音的模拟输入信号。 数字处理系统可以被配置为将模拟输入信号转换成具有多个（例如，多于3个）量化级的第一数字信号，并且在数字域中处理第一数字信号以将第一数字信号压缩成 具有比第一数字信号的量化级别（例如，+1,0，-1）更少的第二数字信号。

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：US20150295584A1

公开(公告)日：2015-10-15

申请号：US14680830

申请日：2015-04-07

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  John L. Melanson ,  John C. Tucker ,  Xiaofan Fei

IPC: H03M1/00 ,  H03M1/70 ,  H03M1/66 ,  H03M1/08 ,  H03M1/78

CPC classification number: H03M1/002 ,  H03M1/0845 ,  H03M1/66 ,  H03M1/662 ,  H03M1/68 ,  H03M1/70 ,  H03M1/785 ,  H03M3/32 ,  H03M3/392 ,  H03M3/414 ,  H03M3/416 ,  H03M3/50

Abstract: In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths including a first processing path and a second processing path, a digital-to-analog stage output, and a controller. The first processing path may include a first digital-to-analog converter for converting the digital input signal into a first intermediate analog signal, the first digital-to-analog converter configured to operate in a high-power state and a low-power state. The second processing path may include a second digital-to-analog converter for converting a digital input signal into a second intermediate analog signal. The digital-to-analog stage output may be configured to generate an analog signal comprising a sum of the first intermediate analog signal and the second intermediate analog signal. The controller may be configured to operate the first digital-to-analog converter in the lower-power state when a magnitude of the digital input signal is below a threshold magnitude.

Abstract translation: 根据本公开的实施例，处理系统可以包括多个处理路径，包括第一处理路径和第二处理路径，数模转换阶段输出和控制器。 第一处理路径可以包括用于将数字输入信号转换成第一中间模拟信号的第一数模转换器，第一数模转换器被配置为在大功率状态和低功率状态 。 第二处理路径可以包括用于将数字输入信号转换成第二中间模拟信号的第二数模转换器。 数模转换级输出可以被配置为产生包括第一中间模拟信号和第二中间模拟信号之和的模拟信号。 控制器可以被配置为当数字输入信号的幅度低于阈值幅度时，在较低功率状态下操作第一数模转换器。

公开(公告)号：US20150222235A1

公开(公告)日：2015-08-06

申请号：US14612889

申请日：2015-02-03

Applicant: Cirrus Logic, Inc.

Inventor： Eric Swanson ,  John L. Melanson ,  John C. Tucker ,  Eric J. King

IPC: H03F1/02 ,  H03F3/217 ,  H04R1/00 ,  H03F3/185

CPC classification number: H02M3/1582 ,  H02M3/1588 ,  H03F1/0227 ,  H03F3/181 ,  H03F3/217

Abstract: A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based on a measured parameter associated with the switching power stage, select a selected operational mode of the power converter from a plurality of operational modes, and sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from an input source of the power converter to the load in accordance with the selected operational mode.A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based at least on an input signal to the switching power stage, determine the differential output voltage to be driven at the load, and based on the differential output voltage to be driven at the load, apply a switch configuration from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to generate the differential output voltage.A method may include sequentially applying a plurality of switch configurations in a power converter to selectively activate or deactivate each of the plurality of switches in order operate the power converter as a differential output buck converter, such that: during a charging phase of the power converter, the power inductor is coupled between (i) one of a first terminal of a power source and a second terminal of the power source and (ii) one of a first terminal of the output load and a second terminal of the output load; during a transfer phase of the power converter, at least one of the plurality of switches is activated in order to couple the power inductor between the first terminal of the output load and a second terminal of the output load; and the output voltage comprises a differential voltage between the first and second terminal of the output load.

公开(公告)号：US20140301571A1

公开(公告)日：2014-10-09

申请号：US14247686

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H04R3/00

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 digital microphone system may include a microphone transducer and a digital processing system. The microphone transducer may be configured to generate an analog input signal indicative of audio sounds incident upon the microphone transducer. The digital processing system may be configured to convert the analog input signal into a first digital signal having three or more quantization levels, and in the digital domain, process the first digital signal to convert the first digital signal into a second digital signal having two quantization levels.

Abstract translation: 根据本公开的实施例，数字麦克风系统可以包括麦克风换能器和数字处理系统。 麦克风换能器可以被配置为产生指示入射到麦克风换能器上的音频声音的模拟输入信号。 数字处理系统可以被配置为将模拟输入信号转换成具有三个或更多个量化级别的第一数字信号，并且在数字域中处理第一数字信号以将第一数字信号转换成具有两个量化的第二数字信号 水平。

公开(公告)号：US10375475B2

公开(公告)日：2019-08-06

申请号：US14247771

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H04R3/02 ,  H04R3/00 ,  H03M3/00 ,  H03M7/32 ,  H03M7/36 ,  H03F1/26 ,  H03F3/16 ,  H04R29/00 ,  H04R19/04

Abstract: In accordance with embodiments of the present disclosure, a digital microphone system may include a microphone transducer and a digital processing system. The microphone transducer may be configured to generate an analog input signal indicative of audio sounds incident upon the microphone transducer. The digital processing system may be configured to convert the analog input signal into a first digital signal having a plurality (e.g., more than 3) of quantization levels, and in the digital domain, process the first digital signal to compress the first digital signal into a second digital signal having fewer quantization levels (e.g., +1, 0, −1) than that of the first digital signal.

公开(公告)号：US20150331656A1

公开(公告)日：2015-11-19

申请号：US14276237

申请日：2014-05-13

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: G06F3/16 ,  G05B15/02

CPC classification number: H04B15/04 ,  G05B15/02 ,  G05F1/14 ,  G06F1/08 ,  G06F3/165 ,  H04B2215/067 ,  H04B2215/068

Abstract: A mobile device may include a digital data driver and digital data receiver for communication of digital signals within the mobile device at a selected clock rate. The mobile device may also have a device external for the digital data driver and digital data receiver for communication of external signals, such as radio-frequency signals, to and from the mobile device. To avoid interference of frequency harmonics of a digital signal with such external signals, the digital data driver may be configured to control the digital signal based on the frequency of the external signals, such that interference of the external signal by spectral content of the digital signal is minimized, while maintaining the selected clock rate.

Abstract translation: 移动设备可以包括数字数据驱动器和数字数据接收器，用于以选定的时钟速率在移动设备内通信数字信号。 移动设备还可以具有用于数字数据驱动器的外部设备和数字数据接收器，用于将外部信号（例如射频信号）传送到移动设备和从移动设备通信。 为了避免数字信号与这种外部信号的频率谐波的干扰，数字数据驱动器可以被配置为基于外部信号的频率来控制数字信号，使得通过数字信号的频谱内容对外部信号的干扰 同时保持选定的时钟频率。

公开(公告)号：US10571484B2

公开(公告)日：2020-02-25

申请号：US14686834

申请日：2015-04-15

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Anindya Bhattacharya ,  Roderick D. Holley ,  Ruoxin Jiang ,  Stephen T. Hodapp ,  John C. Tucker

IPC: G01P15/125

Abstract: In accordance with embodiments of the present disclosure, an apparatus for measuring acceleration may include a spring-mounted mass, a positional encoder configured to measure a position of the spring-mounted mass and output one or more signals indicative of a sine and a cosine of the position, a driver to set and maintain an oscillation of the spring-mounted mass, and a decoder configured to process the one or more signals to calculate an acceleration of the spring-mounted mass.