公开(公告)号：US09478210B2

公开(公告)日：2016-10-25

申请号：US13924935

申请日：2013-06-24

Applicant: Cirrus Logic, Inc.

Inventor： Ryan A. Hellman

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

CPC classification number: G10K11/16 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/1785 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3027

Abstract: In accordance with systems and methods of this disclosure, a method may include generating a feedforward anti-noise signal component from a result of measuring with the reference microphone countering the effects of ambient audio sounds at an acoustic output of a transducer by filtering an output of the reference microphone, adaptively generating a feedback anti-noise signal component from a result of measuring with an error microphone for countering the effects of ambient audio sounds at the acoustic output of the transducer by adapting a response of a feedback adaptive filter that filters a synthesized reference feedback to minimize the ambient audio sounds in the error microphone signal, wherein the synthesized reference feedback is based on a difference between the error microphone signal and the feedback anti-noise signal component.

Abstract translation: 根据本公开的系统和方法，一种方法可以包括从参考麦克风的测量结果中产生前馈抗噪声信号分量，该参考麦克风通过对传感器的声输出的环境音频声音的影响进行滤波， 参考麦克风，通过使用误差麦克风测量结果自适应地产生反馈抗噪声信号分量，用于通过调整反馈自适应滤波器的响应来抵消在换能器的声输出处的环境音频声音的影响， 参考反馈以最小化误差麦克风信号中的环境音频声音，其中合成的参考反馈基于误差麦克风信号和反馈抗噪声信号分量之间的差异。

公开(公告)号：US20160309270A1

公开(公告)日：2016-10-20

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

CPC classification number: H04R29/001 ,  G06F3/165 ,  H04R3/00 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01 ,  H04R2499/11

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.

Abstract translation: 扬声器阻抗可以通过监视扬声器的电压和/或电流来确定。 所计算的阻抗可用于确定包含扬声器的移动设备是在耳机还是离线耳机。 可以通过向扬声器施加测试音低电平信号来辅助阻抗确定。 测试音可能对用户听不到，但用于确定扬声器在测试音频率处的阻抗。 可以使用该测试音调处的阻抗来确定扬声器的谐振频率是否处于与耳外状态相对应的频率。 所测量的扬声器阻抗可以被提供为自适应噪声消除（ANC）算法的反馈，以调整扬声器处的输出。 例如，当从用户的耳朵移除移动设备时，可以禁用ANC算法。

公开(公告)号：US09467776B2

公开(公告)日：2016-10-11

申请号：US13844602

申请日：2013-03-15

Applicant: Cirrus Logic, Inc.

Inventor： Antonio John Miller ,  Jie Su

IPC: H04R3/00

CPC classification number: H04R3/005 ,  H04R2410/05 ,  H04R2499/11

Abstract: Coupling between a user's ear and a speaker of a mobile device may be determined by measuring an impedance of the speaker. When the user presses the mobile device against the user's ear, the speaker impedance changes as a result of loading in the speaker's acoustic radiation impedance. The speaker impedance change may be correlated with the force applied by the user to the mobile device. 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 muted.

Abstract translation: 可以通过测量扬声器的阻抗来确定用户的耳朵和移动设备的扬声器之间的耦合。 当用户将用户的耳朵按压移动设备时，由于扬声器的声辐射阻抗的加载，扬声器的阻抗会改变。 扬声器阻抗变化可能与用户对移动设备施加的力相关。 所测量的扬声器阻抗可以被提供为自适应噪声消除（ANC）算法的反馈，以调整扬声器处的输出。 例如，当从用户的耳朵移除移动设备时，ANC算法可以被静音。

公开(公告)号：US20160286310A1

公开(公告)日：2016-09-29

申请号：US14975015

申请日：2015-12-18

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  John L. Melanson

IPC: H04R3/04

CPC classification number: H04R3/04 ,  G10L19/167 ,  G10L21/0324 ,  H03G7/007 ,  H03G9/005 ,  H03M1/00 ,  H03M1/12 ,  H03M1/1225 ,  H03M1/18 ,  H03M2201/4135 ,  H04L1/20 ,  H04L27/2647 ,  H04R2430/01 ,  H04R2430/03

Abstract: In accordance with embodiments of the present disclosure, a multichip circuit for processing audio signals having dynamic range enhancement information over two or more integrated circuits may include a host integrated circuit and a client integrated circuit. The host integrated circuit may be configured to determine a dynamic range enhancement gain for a digital audio input signal, process the digital audio input signal in accordance with the dynamic range enhancement gain, and transmit audio data based on the processed digital audio input signal. The client integrated circuit may be coupled to the host integrated circuit and may be configured to receive the audio data and wherein the client integrated circuit is provided with the dynamic range enhancement gain and the client integrated circuit is configured to process the audio data with the dynamic range enhancement gain.

Abstract translation: 根据本公开的实施例，用于处理在两个或多个集成电路上具有动态范围增强信息的音频信号的多芯片电路可以包括主机集成电路和客户端集成电路。 主机集成电路可以被配置为确定用于数字音频输入信号的动态范围增强增益，根据动态范围增强增益处理数字音频输入信号，并且基于处理的数字音频输入信号发送音频数据。 客户端集成电路可以耦合到主机集成电路，并且可以被配置为接收音频数据，并且其中向客户端集成电路提供动态范围增强增益，并且客户端集成电路被配置为使用动态范围处理音频数据 范围增强增益。

公开(公告)号：US09438982B2

公开(公告)日：2016-09-06

申请号：US14031287

申请日：2013-09-19

Applicant: Cirrus Logic, Inc.

Inventor： Bharath Kumar Thandri ,  Vivek Jindal

IPC: H04R1/10 ,  H04R5/04

CPC classification number: H04R1/1041 ,  H04R5/04 ,  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.

公开(公告)号：US09425725B2

公开(公告)日：2016-08-23

申请号：US13780466

申请日：2013-02-28

Applicant: Cirrus Logic, Inc.

Inventor： John Laurence Melanson

IPC: H02P21/00 ,  H02P6/18

CPC classification number: H02P6/182 ,  H02P21/24

Abstract: Systems and methods of estimating a motor position of a motor are disclosed. One exemplary system and method involve observing motor currents of the motor at two different times. Average motor voltages of the motor are determined between the two different times. Average back electro motive force (BEMF) values of the motor are calculated between the two different times. The BEMF values are in conformity with the observed motor currents and the average motor voltages. Another exemplary system and method for estimating a rotor position of a motor involve a motor position estimator that receives information from the motor and estimates a rotor position for a future time. The future time corresponds approximately to a desired target current,

Abstract translation: 公开了一种估计电动机的电动机位置的系统和方法。 一个示例性系统和方法涉及在两个不同时间观察电动机的电动机电流。 在两个不同时间之间确定电动机的平均电动机电压。 在两个不同时间之间计算电机的平均后向电动力（BEMF）值。 BEMF值与观察到的电机电流和平均电机电压一致。 用于估计电动机的转子位置的另一示例性系统和方法涉及一种电动机位置估计器，其从电动机接收信息并估计未来时间的转子位置。 未来时间大致对应于期望的目标电流，

公开(公告)号：US09392364B1

公开(公告)日：2016-07-12

申请号：US13968013

申请日：2013-08-15

Applicant: Cirrus Logic, Inc.

Inventor： Ali Abdollahzadeh Milani ,  Antonio John Miller

IPC: H04R3/00

CPC classification number: H04R3/002 ,  H04R3/00 ,  H04R2410/05 ,  H04R2499/11

Abstract: A processing circuit may implement an adaptive filter having a response that generates an anti-noise signal from a reference microphone signal, one or more filters for modeling an electro-acoustic path of the anti-noise signal from a location of an error microphone to an eardrum of a listener and having a response that generates a filtered reference microphone signal from the reference microphone signal, one or more filters for modeling an acoustic path of ambient audio sounds from the location of the error microphone to the eardrum and having a response that generates a synthesized playback corrected error signal based on the error microphone signal, wherein the synthesized playback corrected error signal is indicative of ambient audio sounds present at the eardrum, and a coefficient control block that shapes the response of the adaptive filter in conformity with the filtered reference microphone signal and the synthesized playback corrected error signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the synthesized playback corrected error signal.

Abstract translation: 处理电路可以实现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，用于将来自误差麦克风的位置的抗噪声信号的电声路径建模到一个或多个滤波器的一个或多个滤波器 收听者的鼓膜，并具有从参考麦克风信号产生滤波的参考麦克风信号的响应，一个或多个滤波器，用于将环境音频声音的声学路径从误差麦克风的位置建模到鼓膜，并且具有产生的响应 基于所述误差麦克风信号的合成回放校正误差信号，其中所述合成重放校正误差信号指示在所述鼓膜处存在的环境音频声音，以及系数控制块，其根据所述经滤波的参考对所述自适应滤波器的响应进行整形 麦克风信号和合成回放校正误差信号 e自适应滤波器，以最小化合成回放校正误差信号中的环境音频声音。

公开(公告)号：US09369557B2

公开(公告)日：2016-06-14

申请号：US14197814

申请日：2014-03-05

Applicant: Cirrus Logic, Inc.

Inventor： Roy Scott Kaller ,  Jon D. Hendrix

IPC: H04M1/00 ,  H04M1/58 ,  H04M9/08 ,  G10L21/0364 ,  G10L21/0208

CPC classification number: H04M1/58 ,  G10L21/0364 ,  G10L2021/02082 ,  H04M1/585 ,  H04M9/08

Abstract: A personal audio device includes a sidetone circuit with one or more adjustable coefficients that generates a sidetone signal from the output of a first microphone. The sidetone circuit has one or more adjustable coefficients for altering the relationship between the first microphone signal and the sidetone signal. The personal audio device also includes a transducer for reproducing playback audio and the sidetone signal at an ear of a listener and a second microphone for measuring the output of the transducer as delivered to the ear of the listener. The sidetone circuit includes a calibration circuit for estimating a response of the second microphone to the sidetone signal and adjusting the coefficient of the sidetone circuit according to the estimated response.

Abstract translation: 个人音频设备包括具有一个或多个可调节系数的侧音电路，其从第一麦克风的输出产生侧音信号。 侧音电路具有用于改变第一麦克风信号和侧音信号之间的关系的一个或多个可调系数。 个人音频设备还包括用于再现回放音频的换能器和在收听者的耳朵处的侧音信号，以及用于测量传递到收听者的耳朵的换能器的输出的第二麦克风。 侧音电路包括校准电路，用于估计第二麦克风对侧音信号的响应，并且根据估计的响应调整侧音电路的系数。

公开(公告)号：US09363599B2

公开(公告)日：2016-06-07

申请号：US14864660

申请日：2015-09-24

Applicant: Cirrus Logic, Inc.

Inventor： Jie Su ,  Samuel Oyetunji

IPC: H04R3/00

CPC classification number: H04R3/007

Abstract: In accordance with these and other embodiments of the present disclosure, systems and methods may include a controller configured to be coupled to an audio speaker, wherein the controller receives an audio input signal, and based on a displacement transfer function associated with the audio speaker, processes the audio input signal to generate an output audio signal communicated to the audio speaker, wherein the displacement transfer function correlates an amplitude and a frequency of the audio input signal to an expected displacement of the audio speaker in response to the amplitude and the frequency of the audio input signal.

公开(公告)号：US09362878B1

公开(公告)日：2016-06-07

申请号：US13756799

申请日：2013-02-01

Applicant: Cirrus Logic, Inc.

Inventor： Jie Su

IPC: H03G3/00

CPC classification number: H03G3/007 ,  H03G9/005 ,  H03G9/025 ,  H04R3/007

Abstract: In accordance with embodiments of the present disclosure, a system may include an audio speaker and a controller coupled to the audio speaker. The controller may receive a current signal indicative of an electrical current associated with the audio speaker and a voltage signal indicative of an electrical voltage associated with the audio speaker. In response to the current signal and the voltage signal, the controller may estimate modeled characteristics for the audio speaker, and based on the modeled characteristics, control an audio signal communicated from the controller to the audio speaker wherein the modeled characteristics are based on discrete-time domain information and displacement domain information and the discrete-time domain information and the displacement domain information are used to update the modeled characteristics.

Abstract translation: 根据本公开的实施例，系统可以包括音频扬声器和耦合到音频扬声器的控制器。 控制器可以接收指示与音频扬声器相关联的电流的电流信号和指示与音频扬声器相关联的电压的电压信号。 响应于当前信号和电压信号，控制器可以估计音频扬声器的建模特性，并且基于所建模的特性，控制从控制器传送到音频扬声器的音频信号，其中建模的特性基于离散 - 使用时域信息和位移域信息以及离散时域信息和位移域信息来更新建模特征。