公开(公告)号：US09525940B1

公开(公告)日：2016-12-20

申请号：US14476507

申请日：2014-09-03

Applicant: Cirrus Logic, Inc.

Inventor： Edmund Mark Schneider ,  Aniruddha Satoskar ,  Daniel J. Allen ,  Seyedeh Maryam Mortazavi Zanjani

IPC: H04B15/00 ,  H04R3/02 ,  H03M1/00 ,  H03M1/06 ,  H03M1/18 ,  H03M3/00

CPC classification number: H04R3/02 ,  H03M1/002 ,  H03M1/0631 ,  H03M1/18 ,  H03M1/181 ,  H03M1/188 ,  H03M3/466 ,  H04R3/04 ,  H04R2420/01 ,  H04R2430/03

Abstract: In accordance with embodiments of the present disclosure, a processing system may include multiple selectable processing paths for processing an analog signal in order to reduce noise and increase dynamic range. Techniques are employed to transition between processing paths and calibrate operational parameters of the two paths in order to reduce or eliminate artifacts caused by switching between processing paths.

Abstract translation: 根据本公开的实施例，处理系统可以包括用于处理模拟信号的多个可选择的处理路径，以便降低噪声并增加动态范围。 采用技术来在处理路径之间转换并且校准两个路径的操作参数，以便减少或消除由处理路径之间的切换引起的伪影。

公开(公告)号：US09521712B1

公开(公告)日：2016-12-13

申请号：US14445732

申请日：2014-07-29

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Arnab Kumar Dutta ,  Stephen Hodapp ,  Prashanth Drakshapalli

IPC: G01R19/00 ,  H05B33/08 ,  G01R27/26 ,  G01R27/02

CPC classification number: G01R27/2605 ,  G01R27/14 ,  H05B33/0842

Abstract: Multiple measurements may be obtained via a single pin of an integrated circuit (IC) to set multiple control parameters of a light emitting diode (LED) controller within the IC. For example, a first input signal may be applied from the IC to two or more components via a single IC pin. A first output signal may be obtained from the two or more components via the single IC pin. A second input signal may be applied from the IC to the two or more components via the single IC pin, and a second output signal may be obtained from the two or more components via the single IC pin. A first parameter and a second parameter of the two or more components may be calculated based, at least in part, on the first output signal and the second output signal obtained via the single IC pin.

Abstract translation: 可以通过集成电路（IC）的单个引脚获得多个测量值，以设置IC内的发光二极管（LED）控制器的多个控制参数。 例如，可以经由单个IC引脚从IC向两个或更多个组件施加第一输入信号。 可以经由单个IC引脚从两个或更多个组件获得第一输出信号。 可以经由单个IC引脚从IC向两个或更多个部件施加第二输入信号，并且可以经由单个IC引脚从两个或更多个部件获得第二输出信号。 可以至少部分地基于经由单个IC引脚获得的第一输​​出信号和第二输出信号来计算两个或更多个组件的第一参数和第二参数。

公开(公告)号：US09504106B2

公开(公告)日：2016-11-22

申请号：US14341984

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Thirumalai Rengachari ,  Siddharth Maru ,  Ramin Zanbaghi ,  Firas Azrai ,  Rahul Singh

IPC: H05B37/02 ,  H05B33/08 ,  H02M3/156

CPC classification number: H05B33/0815 ,  H02M3/156 ,  H05B33/0845 ,  H05B37/02

Abstract: A turn-off transition time period, also referred to as a reverse recovery time period, may be compensated for by a controller of a power stage including a bipolar junction transistor (BJT). The reverse recovery time period may be measured in one switching cycle and a subsequent switching cycle may include compensations based on the measured reverse recovery time period. That is the switching on and off of the BJT may be compensated to obtain a desired average output current to a load. When the reverse recovery time period is known, an error in the peak current obtained due to the reverse recovery time period may be calculated. The calculated error may be used to offset the target peak current for controlling the switching of the BJT to begin a turn-off transition of the BJT earlier in a switching cycle and thus reduce error in peak current at the BJT.

Abstract translation: 还可以通过包括双极结型晶体管（BJT）的功率级的控制器补偿关断转换时间段（也称为反向恢复时间周期）。 可以在一个开关周期内测量反向恢复时间段，并且随后的开关周期可以包括基于所测量的反向恢复时间段的补偿。 也就是说，可以补偿BJT的接通和断开以获得期望的负载平均输出电流。 当已知反向恢复时间周期时，可以计算由于反向恢复时间段而获得的峰值电流的误差。 计算出的误差可用于偏移目标峰值电流，以控制BJT的开关，以便在开关周期中较早地开始BJT的关断转换，从而减小BJT的峰值电流误差。

公开(公告)号：US09502020B1

公开(公告)日：2016-11-22

申请号：US14210589

申请日：2014-03-14

Applicant: Cirrus Logic, Inc.

Inventor： Ali Abdollahzadeh Milani ,  Jeffrey Alderson ,  Gautham Devendra Kamath ,  Yang Lu

IPC: H04R29/00 ,  H03G3/00 ,  G10K11/16

CPC classification number: G10K11/16 ,  G10K11/178 ,  G10K11/17835 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3028 ,  G10K2210/3045 ,  G10K2210/3054

Abstract: An adaptive noise canceling (ANC) circuit adaptively generates an anti-noise signal that is injected into the speaker or other transducer output to cause cancellation of ambient audio sounds. At least one microphone provides an error signal indicative of the noise cancellation at the transducer, and the adaptive filter is adapted to minimize the error signal. In order to prevent improper adaptation or instabilities in one or both of the adaptive filters, spikes are detected in the error signal by comparing the error signal or its rate of change to a threshold. Therefore, if the magnitude of the coefficient error is greater than a threshold value for an update, the update is skipped. Alternatively the step size of the updates may be reduced. Similar criteria can be applied to a filter modeling the secondary path, based on detection applied to both the source audio and the error signal.

Abstract translation: 自适应噪声消除（ANC）电路自适应地产生被注入到扬声器或其他换能器输出中的抗噪声信号，以引起环境声音的消除。 至少一个麦克风提供指示换能器处的噪声消除的误差信号，并且自适应滤波器适于使误差信号最小化。 为了防止一个或两个自适应滤波器中的不适当的适应或不稳定性，通过将误差信号或其变化率与阈值相比较，在误差信号中检测尖峰。 因此，如果系数误差的大小大于更新的阈值，则跳过更新。 或者，可以减少更新的步长。 基于对源音频和误差信号两者的检测，可以将类似的标准应用于建模辅助路径的滤波器。

公开(公告)号：US09462376B2

公开(公告)日：2016-10-04

申请号：US13948566

申请日：2013-07-23

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey D. Alderson

IPC: H04R3/00 ,  G10K11/16 ,  G10K11/178

CPC classification number: H04R3/002 ,  G10K11/16 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17833 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3035 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/509

Abstract: In accordance with methods and systems of the present disclosure, a processing circuit may implement a feedback filter having a response that generates a feedback anti-noise signal component from a playback corrected error, the playback corrected error based on a difference between an error microphone signal and a secondary path estimate, and wherein the anti-noise signal comprises at least the feedback anti-noise signal component, a secondary path estimate filter configured to model an electro-acoustic path of the source audio signal and have a response that generates a secondary path estimate from the source audio signal, and a secondary coefficient control block that shapes the response of the secondary path estimate adaptive filter in conformity with a source audio signal and the playback corrected error by adapting the response of the secondary path estimate adaptive filter to minimize the playback corrected error.

Abstract translation: 根据本公开的方法和系统，处理电路可以实现具有响应的反馈滤波器，该响应从回放校正误差产生反馈抗噪声信号分量，基于误差麦克风信号之间的差异的重放校正误差 以及次要路径估计，并且其中所述抗噪声信号至少包括所述反馈噪声信号分量，次路径估计滤波器被配置为对所述源音频信号的电声路径进行建模并具有产生次级路径的响应 来自源音频信号的路径估计，以及二次系数控制块，其通过使辅助路径估计自适应滤波器的响应适应最小化来使源路由估计自适应滤波器的响应与源音频信号和重放校正误差一致， 播放校正错误。

公开(公告)号：US09461537B1

公开(公告)日：2016-10-04

申请号：US14252244

申请日：2014-04-14

Applicant: Cirrus Logic, Inc.

Inventor： Xin Zhao ,  Ku He ,  John L. Melanson ,  Xiaofan Fei

IPC: G05F1/00 ,  H02M3/04 ,  G01R19/00

CPC classification number: H02M3/04 ,  G01R19/0084 ,  G01R19/0092 ,  G01R31/40 ,  H02M3/156 ,  H02M2001/0009

Abstract: A switch control circuit may be utilized for a sequence of switching events: a first event to activate a first switch and deactivate a second switch, wherein a current of an inductor coupled to the first switch and the second switch increases during the first event and has a positive value at an end of the first event; a second event to deactivate the first switch and activate the second switch, wherein the current of an inductor coupled to the first switch and the second switch decreases during the second event; and an impedance event during one of the first event and the second event such that during one of the first event and the second event, the impedance event causes an impedance of the one of the first switch and the second switch to decrease.

Abstract translation: 开关控制电路可以用于一系列切换事件：第一事件以激活第一开关并去激活第二开关，其中耦合到第一开关和第二开关的电感器的电流在第一事件期间增加并具有 在第一个事件结束时的正值; 第二事件，用于停用第一开关并激活第二开关，其中耦合到第一开关和第二开关的电感器的电流在第二事件期间减小; 以及在第一事件和第二事件之一期间的阻抗事件，使得在第一事件和第二事件之一期间，阻抗事件引起第一开关和第二开关中的一个的阻抗减小。

公开(公告)号：US20160255685A1

公开(公告)日：2016-09-01

申请号：US14634716

申请日：2015-02-27

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Ramin Zanbaghi ,  Thirumalai Rengachari ,  Prashanth Drakshapalli ,  Rahul Singh ,  Arnab Kumar Dutta

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H02M3/335 ,  H05B33/0845 ,  H05B33/0887 ,  H05B37/02

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. The controller may operate the power stage by monitoring a start and end of a reverse recovery time of the BJT. Information regarding the start and end of the reverse recovery time may be used in the control of the power stage to improve efficiency of the power stage.

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。 控制器可以通过监视BJT的反向恢复时间的开始和结束来操作功率级。 关于反向恢复时间的开始和结束的信息可以用于功率级的控制，以提高功率级的效率。

公开(公告)号：US09407279B2

公开(公告)日：2016-08-02

申请号：US14617376

申请日：2015-02-09

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Jaimin Mehta ,  Stephen T. Hodapp

IPC: H03M1/10 ,  H03M1/06 ,  H03M1/08 ,  H03M1/66 ,  H03M3/00

CPC classification number: H03M1/1038 ,  H03M1/06 ,  H03M1/0665 ,  H03M1/0863 ,  H03M1/10 ,  H03M1/1009 ,  H03M1/66 ,  H03M3/458

Abstract: An apparatus may include a scrambler element configured to receive an input signal and generate a scrambled thermometer code-like signal having a plurality of bits based on the input signal and having a plurality of possible quantization values. The scrambler element may generate at least one equivalent code of the scrambled thermometer code-like signal for each possible quantization value. For each of one or more of the possible quantization values, the scrambler element may be configured to generate a plurality of possible equivalent codes of the scrambled thermometer code-like signal. Responsive to the input signal indicating a change in quantization value of the scrambled thermometer code-like signal, the scrambler element may change the scrambled thermometer code-like signal by transitioning the smallest possible number of the plurality of bits of the scrambled thermometer code-like signal to change quantization value of the scrambled thermometer code-like signal in accordance with the input signal.

Abstract translation: 装置可以包括扰频器元件，其被配置为接收输入信号并且基于输入信号生成具有多个比特的加扰温度计类似码字的信号，并且具有多个可能的量化值。 加扰器元件可以为每个可能的量化值生成加扰的温度计代码样信号的至少一个等效代码。 对于一个或多个可能的量化值中的每个，加扰器元件可以被配置为生成加扰的温度计代码样信号的多个可能的等效代码。 响应于指示加扰的温度计编码类信号的量化值的改变的输入信号，加扰器元件可以通过转换加扰的温度计代码样信号的多个比特的最小可能数来改变加扰的温度计代码样信号 信号以根据输入信号改变加扰的温度计代码样信号的量化值。

公开(公告)号：US20160180830A1

公开(公告)日：2016-06-23

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：US20160165348A1

公开(公告)日：2016-06-09

申请号：US15042757

申请日：2016-02-12

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Daniel John Allen ,  Aniruddha Satoskar

IPC: H04R3/00 ,  H03F1/02 ,  H03F3/185 ,  H04R29/00

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.