公开(公告)号：US09634621B1

公开(公告)日：2017-04-25

申请号：US14035654

申请日：2013-09-24

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Aniruddha Satoskar ,  Daniel John Allen ,  Bharath Kumar Thandri

IPC: H03F3/20

CPC classification number: H03F1/0227 ,  H02M3/07 ,  H02M2001/0032 ,  H03F1/025 ,  H03F3/3022 ,  H03F3/505 ,  H03F2200/03 ,  H03F2200/211 ,  H03F2200/507 ,  Y02B70/16

Abstract: A method may include providing a power supply voltage to a power supply input of a power amplifier by a charge pump power supply having a select input for selecting an operating mode of the charge pump power supply, such that in a first operating mode, the power supply voltage is equal to a first voltage, and such that in a second operating mode the power supply voltage is equal to a fraction of the first voltage; wherein the power amplifier has an audio input for receiving an audio input signal, and an audio output for providing the output signal, and generates the output signal based on the audio input signal. The method may also include selecting an operating mode of the charge pump power supply based on a magnitude of the power supply voltage and a magnitude of the output signal, such that the charge pump power supply operated in the operating mode having the lowest power supply voltage in which a difference between a magnitude of the power supply voltage and a magnitude of the output signal is more than the predetermined threshold voltage.

公开(公告)号：US09628033B2

公开(公告)日：2017-04-18

申请号：US14840894

申请日：2015-08-31

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  Christophe J. Amadi ,  John L. Melanson

IPC: H03F3/217 ,  H03F1/02 ,  H03F1/08 ,  H03F3/181

CPC classification number: H03F3/2175 ,  H03F1/0277 ,  H03F1/083 ,  H03F3/181 ,  H03F3/185 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2200/231

Abstract: A method for producing an output voltage to a load may include, in a power stage comprising power converter having a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, and an output for producing the output voltage comprising a first output terminal and a second output terminal, controlling the linear amplifier to transfer electrical energy from the input source of the power stage to the load in accordance with one or more least significant bits of a digital input signal, and controlling the power converter in accordance with bits of the digital input signal other than the one or more least significant bits to 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 the input source of the power stage to the load.

公开(公告)号：US20170063318A1

公开(公告)日：2017-03-02

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 ,  H03F3/217 ,  H03F3/187

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.

Abstract translation: 可以通过基于被放大的音频信号控制音频放大器来改善音频放大。 例如，当音频信号电平增加或减小时，升压转换器提供给音频放大器的升压电压也可以增加或减小。 在另一示例中，当音频信号电平降低到低于某一水平时，可以利用升压转换器输入将音频放大器切换成放大音频信号，以便以低电压输入放大音频信号。 可以在耦合到升压转换器和/或音频放大器的数字升压转换器控制器中实现音频放大器的控制。

公开(公告)号：US09584082B1

公开(公告)日：2017-02-28

申请号：US14028769

申请日：2013-09-17

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Aniruddha Satoskar ,  Bharath Kumar Thandri

IPC: H03G3/00

CPC classification number: H03G3/007

Abstract: An audio device may include an electrical terminal for coupling a transducer device to the audio device and an audio circuit for generating an analog audio signal coupled to the electrical terminal. The audio circuit may include a pre-amplifier stage, an amplifier, and a gain selector. The pre-amplifier stage may apply a selectable gain to an audio input signal to generate a pre-amplified analog audio signal, wherein the pre-amplifier stage is powered by a first power supply. The amplifier may amplify the pre-amplified analog audio signal to generate the analog audio signal, wherein the amplifier is powered from a second power supply isolated from the first power supply. The gain selector may select the selectable gain based on a level of the first power supply, such that a difference between the second power supply and the analog audio signal is more than a predetermined headroom threshold voltage.

Abstract translation: 音频设备可以包括用于将换能器设备耦合到音频设备的电气终端和用于产生耦合到电气终端的模拟音频信号的音频电路。 音频电路可以包括前置放大器级，放大器和增益选择器。 预放大器级可以向音频输入信号施加可选择的增益以产生预放大的模拟音频信号，其中前置放大器级由第一电源供电。 放大器可以放大预放大的模拟音频信号以产生模拟音频信号，其中放大器由与第一电源隔离的第二电源供电。 增益选择器可以基于第一电源的电平来选择可选择的增益，使得第二电源和模拟音频信号之间的差大于预定的净空阈值电压。

公开(公告)号：US09571931B1

公开(公告)日：2017-02-14

申请号：US14247987

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H04R3/02 ,  H04R3/00 ,  H04R29/00 ,  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: To correct for non-linearities in the response of a microphone as a function of sound pressure level incident upon the microphone, a displacement non-linearity function is applied to the signal path of the microphone, wherein the displacement non-linearity function is a function of the digital audio output signal and has a response modeling non-linearities of the displacement as a function of a sound pressure level incident upon the microphone.

Abstract translation: 为了校正麦克风的响应中的非线性作为入射到麦克风的声压级的函数，位移非线性函数被施加到麦克风的信号路径，其中位移非线性函数是函数 的数字音频输出信号，并且具有作为入射到麦克风的声压级的函数的位移的非线性的响应建模。

公开(公告)号：US09510078B2

公开(公告)日：2016-11-29

申请号：US14930274

申请日：2015-11-02

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. Swanson

IPC: H04R1/10 ,  G06F17/30 ,  H04R5/033

CPC classification number: H04R1/1025 ,  G06F17/3074 ,  H04R1/1016 ,  H04R1/1041 ,  H04R5/033 ,  H04R2201/103 ,  H04R2420/07

Abstract: A wireless earpiece may include a local memory for storing audio files that can be played back by the user. The wireless earpiece may fit entirely within the user's ear canal. Audio files, for example music files, may be loaded on the wireless earpiece by docking the wireless earpiece with a mobile device, which includes a larger memory storing the user's library of music files. The stored audio files may be received from a mobile device that were automatically selected from a library of music files by the mobile device without intervention from the user. To provide stereo sound, two wireless earpieces may be worn by the user and docked separately with the mobile device. Each of the two wireless earpieces may store a single channel of an audio file, which is separated by the mobile device during synchronization.

Abstract translation: 无线耳机可以包括用于存储可由用户播放的音频文件的本地存储器。 无线耳机可以完全配合在用户的耳道内。 音频文件（例如音乐文件）可以通过将无线耳机与移动设备对接而被加载到无线耳机上，移动设备包括存储用户的音乐文件库的更大的存储器。 存储的音频文件可以从移动设备从音乐文件库中自动选择的移动设备接收，而不需要用户的干预。 为了提供立体声，用户可以佩戴两个无线耳机，并与移动设备单独对接。 两个无线耳机中的每一个可以存储在同步期间由移动设备分离的音频文件的单个通道。

公开(公告)号：US09467777B2

公开(公告)日：2016-10-11

申请号：US13844744

申请日：2013-03-15

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. Swanson ,  Ed Schneider

IPC: H04R3/00

CPC classification number: H04R3/005

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US09460701B2

公开(公告)日：2016-10-04

申请号：US13943454

申请日：2013-07-16

Applicant: Cirrus Logic, Inc.

Inventor： Chin Huang Yong ,  Jeffrey D. Alderson

IPC: A61F11/06 ,  G10K11/16 ,  G10K11/178

CPC classification number: G10K11/16 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17833 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/3014 ,  G10K2210/3017 ,  G10K2210/3022 ,  G10K2210/3027 ,  G10K2210/30351

Abstract: A processing circuit may comprise an adaptive filter having a response generating an anti-noise signal from a reference microphone signal, a secondary path estimate filter modeling an electro-acoustic path of a source audio signal, a biasing portion that generates a scaled anti-noise signal by applying a scaling factor and the response of the secondary path estimate filter to the anti-noise signal, and a coefficient control block that shapes the response of the adaptive filter in conformity with the reference microphone signal and a modified playback corrected error signal by adapting the response of the adaptive filter to minimize ambient audio sounds in the error microphone signal, wherein the playback corrected error is based on a difference between the error microphone signal and the source audio signal and the modified playback corrected error signal is based on a difference between the playback corrected error signal and the scaled anti-noise signal.

Abstract translation: 处理电路可以包括具有从参考麦克风信号产生抗噪声信号的响应的自适应滤波器，对源音频信号的电声路径建模的次路径估计滤波器，产生缩放抗噪声的偏置部分 通过对抗噪声信号应用缩放因子和次路径估计滤波器的响应的信号;以及系数控制块，其根据参考麦克风信号和经修改的重放校正误差信号对自适应滤波器的响应进行整形， 适应自适应滤波器的响应以最小化误差麦克风信号中的环境音频声音，其中重放校正误差基于误差麦克风信号和源音频信号之间的差异，并且经修改的重放校正误差信号基于差 在重放校正误差信号和缩放的抗噪声信号之间。

公开(公告)号：US09419562B1

公开(公告)日：2016-08-16

申请号：US14248054

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H03F1/02 ,  H03F1/26 ,  H03F3/16

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: An amplifier may include a plurality of stages, wherein each stage may have an amplifier stage output configured to generate an amplifier output signal and a transistor coupled at its gate terminal to the amplifier input and to the gate terminals of the transistors of the other amplifier stages. Each stage may be configured to periodically and cyclically operate in an amplifier mode in which the amplifier stage generates at its corresponding amplifier stage output a power-amplified version of a signal received at the amplifier input and a in reset mode in which the transistor of the stage operating in the reset mode has an electrical property thereof reset. At any given time, at least one amplifier stage is operating in the amplifier mode. The amplifier may be configured to output as an output signal one of the amplifier output signals corresponding to an amplifier stage operating in the amplifier mode.

Abstract translation: 放大器可以包括多个级，其中每个级可以具有被配置为产生放大器输出信号的放大器级输出和在其栅极端耦合到放大器输入端和耦合到其它放大器级的晶体管的栅极端子的晶体管 。 每个级可以被配置为在放大器模式中周期性地和周期性地工作，其中放大器级在其相应的放大级产生输出在放大器输入处接收的信号的功率放大形式，在复位模式中， 在复位模式下工作的电平具有电性能的复位。 在任何给定时间，至少一个放大器级在放大器模式下工作。 放大器可以被配置为输出对应于以放大器模式工作的放大器级的放大器输出信号之一作为输出信号。

公开(公告)号：US09414150B2

公开(公告)日：2016-08-09

申请号：US13968007

申请日：2013-08-15

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Jeffrey Alderson ,  Ali Abdollahzadeh Milani ,  Dayong Zhou ,  Yang Lu

IPC: G10K11/16 ,  H04R1/24 ,  G10K11/178 ,  H04R3/12 ,  H04R3/00 ,  H04H40/72 ,  H04R1/10

CPC classification number: H04R1/1083 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3019 ,  G10K2210/3028 ,  H04R1/24 ,  H04R3/005 ,  H04R3/12 ,  H04R2410/05 ,  H04R2460/01

Abstract: A personal audio device including multiple output transducers for reproducing different frequency bands of a source audio signal, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal for each of the transducers from at least one microphone signal that measures the ambient audio to generate anti-noise signals. The anti-noise signals are generated by separate adaptive filters such that the anti-noise signals cause substantial cancellation of the ambient audio at their corresponding transducers. The use of separate adaptive filters provides low-latency operation, since a crossover is not needed to split the anti-noise into the appropriate frequency bands. The adaptive filters can be implemented or biased to generate anti-noise only in the frequency band corresponding to the particular adaptive filter. The anti-noise signals are combined with source audio of the appropriate frequency band to provide outputs for the corresponding transducers.

Abstract translation: 包括用于再现源音频信号的不同频带的多个输出换能器的个人音频设备包括自适应噪声消除（ANC）电路，该自适应噪声消除（ANC）电路从至少一个麦克风信号自适应地产生每个换能器的抗噪声信号，该麦克风信号测量 环境音频产生抗噪声信号。 抗噪声信号由单独的自适应滤波器产生，使得抗噪声信号在其相应的换能器处引起环境音频的实质消除。 使用单独的自适应滤波器提供低等待时间操作，因为不需要交叉来将抗噪声分解成适当的频带。 可以实现或偏置自适应滤波器以仅在对应于特定自适应滤波器的频带中产生抗噪声。 抗噪声信号与适当频带的源音频组合，为相应的换能器提供输出。