公开(公告)号：US09602939B2

公开(公告)日：2017-03-21

申请号：US15195785

申请日：2016-06-28

Applicant: Cirrus Logic, Inc.

Inventor： Antonio John Miller ,  Jie Su

IPC: H04R29/00 ,  G06F3/16 ,  H04R3/00

Abstract: A speaker impedance may be determined by monitoring a voltage and/or current of the speaker. The calculated impedance may be used to determine whether the mobile device containing the speaker is on- or off-ear. The impedance determination may be assisted by applying a test tone low level signal to the speaker. The test tone may be inaudible to the user, but used to determine an impedance of the speaker at the frequency of the test tone. The impedance at that test tone may be used to determine whether a resonance frequency of the speaker is at a frequency corresponding to an on- or off-ear condition. The measured speaker impedance may be provided as feedback to an adaptive noise cancellation (ANC) algorithm to adjust the output at the speaker. For example, when the mobile device is removed from the user's ear, the ANC algorithm may be disabled.

公开(公告)号：US09599977B1

公开(公告)日：2017-03-21

申请号：US14198076

申请日：2014-03-05

Applicant: Cirrus Logic, Inc.

Inventor： Jean C. Pina ,  John L. Melanson ,  Robert T. Grisamore ,  Eric J. King ,  Spencer Isaacson

IPC: G05D3/12 ,  G05B19/042 ,  G05B19/05

CPC classification number: G05B19/054 ,  G05B19/0423 ,  G05B19/0428

Abstract: A power train may have a power train input and a power train output, wherein the power train is configured to transfer electrical energy from the power train input to a load coupled to the power train output in conformity with one or more power train control signals. A scheduler may be configured to receive events from the power train and, responsive to each particular event, schedule execution of a thread of control instructions responsive to the particular event, wherein the thread is selected from a plurality of threads. A processor may be configured to execute the threads of control instructions scheduled by the scheduler, such that for each particular event the processor generates one or more power train control signals responsive to the particular event within a first switching cycle of receipt of the particular event or within a second switching cycle immediately subsequent to the first switching cycle.

公开(公告)号：US20170047895A1

公开(公告)日：2017-02-16

申请号：US15336995

申请日：2016-10-28

Applicant: Cirrus Logic, Inc.

Inventor： Ramin ZANBAGHI

IPC: H03F1/02 ,  H03F3/185 ,  H03F3/217 ,  H03F1/30

Abstract: An integrated circuit may have two signal paths: an open-loop modulator (which may comprise a digital-input Class-D amplifier) and a closed-loop modulator (which may comprise an analog-input Class-D amplifier). A control subsystem may be capable of selecting either of the open-loop modulator or the closed-loop modulator as a selected path based on one or more characteristics (e.g., signal magnitude) of an input audio signal. For example, for higher-magnitude signals, the closed-loop modulator may be selected while the open-loop modulator may be selected for lower-magnitude signals. In some instances, when the open-loop modulator is selected as the selected path, the closed-loop modulator may power off, which may reduce power consumption. In addition, one or more techniques may be applied to reduce or eliminate user-perceptible audio artifacts caused by switching between the open-loop modulator and the closed-loop modulator, and vice versa.

Abstract translation: 集成电路可以具有两个信号路径：开环调制器（其可以包括数字输入D类放大器）和闭环调制器（其可以包括模拟输入D类放大器）。 控制子系统可以基于输入音频信号的一个或多个特性（例如，信号幅度）来选择开环调制器或闭环调制器中的任一个作为选择的路径。 例如，对于较高幅度的信号，可以选择闭环调制器，同时为低电平信号选择开环调制器。 在一些情况下，当选择开环调制器作为选择的路径时，闭环调制器可以断电，这可能降低功耗。 此外，可以应用一种或多种技术来减少或消除由开环调制器和闭环调制器之间的切换引起的用户可感知的音频伪像，反之亦然。

公开(公告)号：US09552805B2

公开(公告)日：2017-01-24

申请号：US14577519

申请日：2014-12-19

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Antonio J. Miller ,  Ning Li

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/178 ,  G10K11/17833 ,  G10K11/17875 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/506 ,  H04R1/1083 ,  H04R2460/01

Abstract: A method for cancelling ambient audio sounds in the proximity of a transducer may include receiving an error microphone signal indicative of the output of the transducer and ambient audio sounds at the transducer. The method may also include generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer, wherein generating the anti-noise signal comprises applying a feedback filter having a response that generates a feedback anti-noise signal based on the error microphone signal and applying a variable gain element in series with the feedback filter. The method may further include monitoring whether an ambient audio event is occurring that could cause the feedback filter to generate an undesirable component in the anti-noise signal and controlling the gain of the variable gain element to reduce the undesirable component.

Abstract translation: 用于消除传感器附近的环境音频声音的方法可以包括接收指示换能器的输出的误差麦克风信号和换能器处的环境音频声音。 该方法还可以包括产生用于抵消在换能器的声输出处的环境音频声音的影响的抗噪声信号，其中产生抗噪声信号包括应用具有产生反馈抗噪声信号的响应的反馈滤波器 基于误差麦克风信号并与反馈滤波器串联地施加可变增益元件。 该方法还可以包括监视是否正在发生可能导致反馈滤波器在抗噪声信号中产生不期望的分量并且控制可变增益元件的增益以减少不期望的分量的环境音频事件。

公开(公告)号：US09504118B2

公开(公告)日：2016-11-22

申请号：US14624475

申请日：2015-02-17

Applicant: Cirrus Logic, Inc.

Inventor： Shatam Agarwal ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0887 ,  H05B33/0815

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as a converter in LED-based light bulbs. The power stage may be operated by a controller to maintain a desired current output to the LED load. A resistor may be coupled to the BJT through a switch at the emitter of the BJT. The switch may regulate operation of the BJT by allowing current flow to ground through the resistor. The controller may perform measurements of the resistor to allow higher accuracy determinations of the current through the BJT and thus improve regulation of current to the LED load.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如基于LED的灯泡中的转换器。 功率级可以由控制器操作以保持对LED负载的期望的电流输出。 电阻器可以通过BJT的发射极处的开关耦合到BJT。 开关可以通过电流流过地电流来调节BJT的工作。 控制器可以执行电阻的测量，以允许通过BJT的电流的更高的精度确定，从而改善对LED负载的电流的调节。

公开(公告)号：US09479868B2

公开(公告)日：2016-10-25

申请号：US14036136

申请日：2013-09-25

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Daniel John Allen ,  Aniruddha Satoskar

IPC: H04R3/00 ,  H04R29/00 ,  G10K11/178 ,  H03F1/02 ,  H03F3/181 ,  H03F3/52 ,  H03F3/185 ,  H03F1/52 ,  H03F3/183 ,  H04R5/04

CPC classification number: 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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US09467778B2

公开(公告)日：2016-10-11

申请号：US13844802

申请日：2013-03-16

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：US20160242258A1

公开(公告)日：2016-08-18

申请号：US14624475

申请日：2015-02-17

Applicant: Cirrus Logic, Inc.

Inventor： Shatam Agarwal ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0887 ,  H05B33/0815

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as a converter in LED-based light bulbs. The power stage may be operated by a controller to maintain a desired current output to the LED load. A resistor may be coupled to the BJT through a switch at the emitter of the BJT. The switch may regulate operation of the BJT by allowing current flow to ground through the resistor. The controller may perform measurements of the resistor to allow higher accuracy determinations of the current through the BJT and thus improve regulation of current to the LED load.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如基于LED的灯泡中的转换器。 功率级可以由控制器操作以保持对LED负载的期望的电流输出。 电阻器可以通过BJT的发射极处的开关耦合到BJT。 开关可以通过电流流过地电流来调节BJT的工作。 控制器可以执行电阻的测量，以允许通过BJT的电流的更高的精度确定，从而改善对LED负载的电流的调节。

公开(公告)号：US09357300B2

公开(公告)日：2016-05-31

申请号：US14864639

申请日：2015-09-24

Applicant: Cirrus Logic, Inc.

Inventor： Jie Su

IPC: H04R3/00

CPC classification number: H04R3/007

Abstract: 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.

公开(公告)号：US20160145093A1

公开(公告)日：2016-05-26

申请号：US14942824

申请日：2015-11-16

Applicant: Cirrus Logic, Inc.

Inventor： Shanjen Pan ,  Marc L. Tarabbia

IPC: B81B3/00 ,  B81C1/00 ,  H04R23/00

CPC classification number: B81B3/0086 ,  B81B2201/0257 ,  B81C1/00698 ,  H04R19/005 ,  H04R19/04 ,  H04R2307/025

Abstract: A fully depleted region may be used to reduce poly-to-substrate parasitic capacitance in an electronic device with poly-silicon layer. When the fully depleted region is located at least partially beneath the electronic device, an additional parasitic capacitance is formed between the fully depleted region and the substrate region. This additional parasitic capacitance is coupled in series with a first parasitic capacitance between a poly-silicon layer of the electronic device and the doped region. The series combination of the first parasitic capacitance and the additional parasitic capacitance results in an overall reduction of parasitic capacitance experience by an electronic device. The structure may include two doped regions on sides of the electronic device to form a fully depleted region based on lateral interaction of dopant in the doped regions and the substrate region.

Abstract translation: 可以使用完全耗尽区域来减少具有多晶硅层的电子器件中的多对衬底寄生电容。 当完全耗尽区域至少部分地位于电子器件下方时，在完全耗尽区域和衬底区域之间形成附加的寄生电容。 该额外的寄生电容与电子器件的多晶硅层与掺杂区域之间的第一寄生电容串联耦合。 第一寄生电容和附加寄生电容的串联组合导致电子器件的寄生电容体验的总体减小。 该结构可以在电子器件的侧面上包括两个掺杂区域，以基于掺杂区域和衬底区域中掺杂剂的横向相互作用形成完全耗尽区域。