公开(公告)号：US20140314246A1

公开(公告)日：2014-10-23

申请号：US13924935

申请日：2013-06-24

Applicant: Cirrus Logic, Inc.

Inventor： Ryan A. Hellman

IPC: G10K11/16

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：US20140312797A1

公开(公告)日：2014-10-23

申请号：US14158445

申请日：2014-01-17

Applicant: Cirrus Logic, Inc.

Inventor： Ramin ZANBAGHI ,  Arnab Kumar DUTTA ,  Firas AZRAI

IPC: H05B33/08

CPC classification number: H05B33/0872 ,  H02M7/5383 ,  H05B33/0815 ,  H05B33/0866 ,  Y02B20/347 ,  Y02B70/1441

Abstract: A self-oscillating resonator (SOR) may be used to control current through light emitting diodes (LEDs). The SOR may be started and stopped by a controller coupled to a transistor switch in the SOR. The controller may output a control signal that starts and stops the SOR by coupling a supply voltage or a ground to a base of the transistor switch in the SOR. Additional control over the current output to the LEDs may be gained through a resistive DAC coupled to the SOR and duty cycling the SOR.

Abstract translation: 自振荡谐振器（SOR）可用于控制通过发光二极管（LED）的电流。 SOR可以由耦合到SOR中的晶体管开关的控制器启动和停止。 控制器可以通过在SOR中将电源电压或接地耦合到晶体管开关的基极来输出启动和停止SOR的控制信号。 可以通过耦合到SOR的电阻式DAC和SOR负载来获得对LED的电流输出的额外控制。

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：US20140270247A1

公开(公告)日：2014-09-18

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：US20140270224A1

公开(公告)日：2014-09-18

申请号：US14062951

申请日：2013-10-25

Applicant: Cirrus Logic, Inc.

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

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3028

Abstract: An adaptive noise canceller adapts a secondary path modeling response using ambient noise, rather than using another noise source or source audio as a training source. Anti-noise generated from a reference microphone signal using a first adaptive filter is used as the training signal for training the secondary path response. Ambient noise at the error microphone is removed from an error microphone signal, so that only anti-noise remains. A primary path modeling adaptive filter is used to modify the reference microphone signal to generate a source of ambient noise that is correlated with the ambient noise present at the error microphone, which is then subtracted from the error microphone signal to generate the error signal. The primary path modeling adaptive filter is previously adapted by minimizing components of the error microphone signal appearing in an output of the primary path adaptive filter while the anti-noise signal is muted.

Abstract translation: 自适应噪声消除器使用环境噪声来适应次级路径建模响应，而不是使用另一噪声源或源音频作为训练源。 使用第一自适应滤波器从参考麦克风信号产生的抗噪声被用作用于训练辅助路径响应的训练信号。 错误麦克风处的环境噪声从误差麦克风信号中消除，从而仅保留抗噪声。 主路径建模自适应滤波器用于修改参考麦克风信号以产生与误差麦克风上存在的环境噪声相关的环境噪声源，然后将其从误差麦克风信号中减去以产生误差信号。 先前通过使主路径自适应滤波器的输出中出现的误差麦克风信号的分量最小化，同时抗噪声信号被静音，来先适应主路径建模自适应滤波器。

公开(公告)号：US20140270208A1

公开(公告)日：2014-09-18

申请号：US13844602

申请日：2013-03-15

Applicant: CIRRUS LOGIC, INC.

Inventor： Antonio John Miller ,  Jie Su

IPC: H04R29/00

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：US20140266109A1

公开(公告)日：2014-09-18

申请号：US13829945

申请日：2013-03-14

Applicant: CIRRUS LOGIC, INC.

Inventor： Lingli Zhang ,  Dan Shen ,  Johann Gaboriau

IPC: H02M1/15

CPC classification number: H02M1/15 ,  H02M3/1588 ,  H03K17/162 ,  H03K2217/0063 ,  Y02B70/1466

Abstract: In accordance with embodiments of the present disclosure, systems and methods may include an input configured to indicate a switching node voltage of a switching node of a power converter comprising a first switch device coupled at its non-gate terminals between a ground voltage and the switching node and a second switch device coupled at its non-gate terminals between an output supply node and the switching node. The systems and methods may also include a predriver circuit coupled to the input and a gate terminal of the first switch device, the predriver circuit configured to drive an input voltage signal to the gate terminal of the first switch device and configured to select an effective impedance of the gate terminal of the first switch device based on the input.

Abstract translation: 根据本公开的实施例，系统和方法可以包括被配置为指示功率转换器的开关节点的开关节点电压的输入，该功率转换器的开关节点包括在其非栅极端子处接地电压和开关 节点和第二开关器件，其在非栅极端子处耦合在输出电源节点和开关节点之间。 所述系统和方法还可以包括耦合到第一开关器件的输入端和栅极端子的预驱动电路，该预驱动电路被配置为将输入电压信号驱动到第一开关器件的栅极端并被配置为选择有效阻抗 基于输入的第一开关装置的栅极端子。

公开(公告)号：US20140265933A1

公开(公告)日：2014-09-18

申请号：US14101963

申请日：2013-12-10

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric King ,  Siddharth Maru

IPC: H05B33/08

CPC classification number: H05B33/0806 ,  H05B33/0845 ,  H05B33/0848 ,  H05B39/044 ,  Y02B20/383

Abstract: Systems and methods for learning dimmer characteristics provide improved efficiency in operating lighting devices. In one embodiment, an apparatus includes a lamp controller that is configured to monitor voltage information associated with one or more lamps or a dimmer of a system, adjust one or more parameters of an attach current profile in conformity with the voltage information to arrive at a selected attach current profile, and apply within the system the selected attach current profile.

Abstract translation: 用于学习调光特性的系统和方法提高了操作照明装置的效率。 在一个实施例中，一种装置包括灯控制器，其被配置为监视与一个或多个灯或系统的调光器相关联的电压信息，根据电压信息调整附接电流曲线的一个或多个参数以达到 选择附加电流配置文件，并在系统中应用所选的连接电流配置文件。

公开(公告)号：US20140265893A1

公开(公告)日：2014-09-18

申请号：US14212546

申请日：2014-03-14

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric King ,  Siddharth Maru

IPC: H05B33/08

CPC classification number: H05B33/0806 ,  H05B33/0845 ,  H05B33/0848 ,  H05B39/044 ,  Y02B20/383

Abstract: A circuit for powering high-efficiency lighting devices from a thyristor-controlled dimmer includes a power converter for powering the high-efficiency lighting devices from input terminals of the circuit. The circuit also includes a control circuit that controls the input current drawn by the input terminals at least while the power converter transfers energy to the lighting devices. The circuit also includes a sensing circuit that determines or measures at least one attach current characteristic at the input terminals and stores an indication of the characteristic for subsequent operation of the control circuit.

Abstract translation: 用于从晶闸管控制的调光器为高效照明装置供电的电路包括用于从电路的输入端为高效照明装置供电的电力转换器。 该电路还包括控制电路，其至少在电力转换器将能量传递到照明装置时，控制由输入端子汲取的输入电流。 电路还包括感测电路，其确定或测量输入端子处的至少一个附着电流特性，并存储用于控制电路的后续操作的特性指示。

公开(公告)号：US20140167652A1

公开(公告)日：2014-06-19

申请号：US13903632

申请日：2013-05-28

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  Daniel J. Baker ,  John L. Melanson

IPC: H05B33/08

CPC classification number: F21V23/02 ,  H05B33/0815

Abstract: In accordance with systems and methods of the present disclosure, an apparatus may include a power converter and a controller. The controller may be configured to monitor a voltage at an input of the power converter, cause the power controller to transfer energy from the input to a load at a target current, decrease the target current responsive to determining that the voltage is less than or equal to an undervoltage threshold, and increase the target current responsive to determining that the voltage is greater than or equal to a maximum threshold voltage.

Abstract translation: 根据本公开的系统和方法，装置可以包括功率转换器和控制器。 控制器可以被配置为监视功率转换器的输入处的电压，使得功率控制器将能量从输入传递到目标电流的负载，响应于确定电压小于或等于 响应于确定电压大于或等于最大阈值电压而增加目标电流。