公开(公告)号：US20150078560A1

公开(公告)日：2015-03-19

申请号：US14036682

申请日：2013-09-25

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Daniel John Allen ,  Aniruddha Satoskar

IPC: 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.

Abstract translation: 根据本公开的系统和方法，音频设备可以包括电气终端，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：US20150028768A1

公开(公告)日：2015-01-29

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: 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：US20140307887A1

公开(公告)日：2014-10-16

申请号：US13948566

申请日：2013-07-23

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey D. Alderson

IPC: H04R3/00

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：US20140301572A1

公开(公告)日：2014-10-09

申请号：US14247771

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 a plurality (e.g., more than 3) of quantization levels, and in the digital domain, process the first digital signal to compress the first digital signal into a second digital signal having fewer quantization levels (e.g., +1, 0, −1) than that of the first digital signal.

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多个（例如，多于3个）量化级的第一数字信号，并且在数字域中处理第一数字信号以将第一数字信号压缩成 具有比第一数字信号的量化级别（例如，+1,0，-1）更少的第二数字信号。

公开(公告)号：US08842031B1

公开(公告)日：2014-09-23

申请号：US13932830

申请日：2013-07-01

Applicant: Cirrus Logic, Inc.

Inventor： Mohammad Ranjbar ,  Bruce Eliot Duewer

IPC: H03M3/00

CPC classification number: H03M3/444

Abstract: The stability of a delta-sigma modulator may be improved by limiting a value within the delta-sigma modulator. For example, the value provided to a quantizer may be limited, by a limiter circuit in the delta-sigma modulator, to a value within a single step range of the quantizer. The limiter circuit may be placed in an inner loop of the delta-sigma modulator to decouple the stability of the inner loop from an outer loop. For example, a delta-sigma modulator may be constructed with an inner loop having a sixth order and an outer loop having a second order, in which the stability of the delta-sigma modulator is proportional to that of a second order.

Abstract translation: 通过限制δ-Σ调制器内的值，可以提高Δ-Σ调制器的稳定性。 例如，提供给量化器的值可以通过Δ-Σ调制器中的限幅器电路限制在量化器的单个步长范围内的值。 限制器电路可以放置在Δ-Σ调制器的内环中，以将内环的稳定性与外环隔离。 例如，Δ-Σ调制器可以被构造成具有具有第六级的内环和具有二阶的外环，其中Δ-Σ调制器的稳定性与第二级的稳定性成比例。

公开(公告)号：US20140270222A1

公开(公告)日：2014-09-18

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: H04R3/00

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生成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。

公开(公告)号：US20140266126A1

公开(公告)日：2014-09-18

申请号：US13830047

申请日：2013-03-14

Applicant: CIRRUS LOGIC, INC.

Inventor： Dan Shen ,  Johann Gaboriau ,  Lingli Zhang ,  Christian Larsen

IPC: H02M1/08

CPC classification number: H02M1/08

Abstract: In accordance with embodiments of the present disclosure, systems and methods may include a switch coupled at its gate terminal to an input signal voltage, the input signal voltage for controlling a gate voltage of a gate terminal of a driver device coupled at its non-gate terminals between a rail voltage and an output node. The systems and methods may also include a diode having a first terminal and a second terminal, the diode coupled to a non-gate terminal of the switch such that when the switch is enabled, the first terminal is electrically coupled to the gate terminal of the driver device and the second terminal is electrically coupled to the output node.

Abstract translation: 根据本公开的实施例，系统和方法可以包括在其栅极端子处耦合到输入信号电压的开关，用于控制耦合在其非门的驱动器件的栅极端子的栅极电压的输入信号电压 轨道电压和输出节点之间的端子。 系统和方法还可以包括具有第一端子和第二端子的二极管，二极管耦合到开关的非栅极端子，使得当开关被使能时，第一端子电连接到开关的栅极端子 驱动器装置和第二端子电耦合到输出节点。

公开(公告)号：US20140265916A1

公开(公告)日：2014-09-18

申请号：US14212376

申请日：2014-03-14

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Prashanth Drakshapalli ,  Siddharth Maru ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0809 ,  H05B33/0815 ,  H05B33/0848 ,  Y02B20/346 ,  Y02B20/383

Abstract: An electronic system and method include a controller to actively control transfer of excess energy to an auxiliary-winding of an auxiliary power dissipation circuit. The excess energy is a transfer of energy from a primary winding of a switching power converter to the auxiliary-winding of the auxiliary power dissipation circuit. In at least one embodiment, the electronic system is a lighting system that includes a triac-based dimmer. The excess energy is energy drawn through the primary-side winding of the switching power converter to provide operational compatibility between a dimmer through which a power supply provides energy to the switching power converter and a load to which the switching power converter provides energy.

Abstract translation: 电子系统和方法包括控制器，用于主动地控制向辅助功率耗散电路的辅助绕组传递过剩能量。 过量的能量是能量从开关功率转换器的初级绕组传递到辅助功率耗散电路的辅助绕组。 在至少一个实施例中，电子系统是包括基于三端双向可控硅的调光器的照明系统。 过量的能量是通过开关功率转换器的初级侧绕组抽取的能量，以提供调光器之间的操作兼容性，通过该调光器，电源向开关功率转换器提供能量和开关功率转换器提供能量的负载。

公开(公告)号：US20140226827A1

公开(公告)日：2014-08-14

申请号：US13762504

申请日：2013-02-08

Applicant: CIRRUS LOGIC, INC.

Inventor： Ali Abdollahzadeh Milani

IPC: H04R29/00

CPC classification number: H04R29/00 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3023 ,  G10L21/0216 ,  G10L21/0224 ,  G10L2021/02165 ,  H04R29/004

Abstract: An RMS detector uses the concept of the k-NN (classifying using nearest neighbors)-algorithm in order to obtain RMS values. A rms detector using first-order regressor with a variable smoothing factor is modified to penalize samples from center of data in order to obtain RMS values. Samples which vary greatly from the background noise levels, such as speech, scratch, wind and other noise spikes, are dampened in the RMS calculation. When background noise changes, the system will track the changes in background noise and include the changes in the calculation of the corrected RMS value. A minimum tracker runs more often (e.g. two or three times) than the rate as in prior art detectors and methods, tracks the minimum rms value, which is to compute a normalized distance value, which in turn is used to normalize the smoothing factor. From this data, a corrected or revised RMS value is determined as the function of the previous RMS value multiplied by one minus the smoothing factor plus the smooth factor times the minimum rms value to output the corrected RMS for the present invention. The rms value is used to generate a reset signal for the minimum tracker and is used to avoid deadlock in the tracker, for example, when the background signal increases/decreases over time.

Abstract translation: RMS检测器使用k-NN（使用最近邻）分类的算法 - 算法来获得RMS值。 使用具有可变平滑因子的一阶回归器的有效值检测器被修改以惩罚来自数据中心的样本，以获得RMS值。 在RMS计算中，与背景噪声水平差异很大的样本（如语音，划痕，风和其他噪声尖峰）都会受到影响。 当背景噪声改变时，系统将跟踪背景噪声的变化，并包括校正RMS值的计算中的变化。 最小跟踪器比现有技术的检测器和方法中的速率更频繁（例如两次或三次），跟踪最小均方根值，其是计算归一化距离值，其又被用于归一化平滑因子。 根据该数据，校正或修正的RMS值被确定为先前RMS值乘以1的函数减去平滑因子加上平滑因子乘以最小均方根值，以输出本发明的校正RMS。 均方根值用于产生最小跟踪器的复位信号，并用于避免跟踪器中的死锁，例如当背景信号随时间增加/减小时。

公开(公告)号：US20140167639A1

公开(公告)日：2014-06-19

申请号：US13903591

申请日：2013-05-28

Applicant: Cirrus Logic, Inc.

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

IPC: F21V23/02

CPC classification number: F21V23/02 ,  H05B33/0815

Abstract: Methods and systems to provide compatibility between a load and a secondary winding of an electronic transformer driven by a leading-edge dimmer may include: (a) responsive to determining that energy is available from the electronic transformer, drawing a requested amount of power from the electronic transformer thus transferring energy from the electronic transformer to an energy storage device in accordance with the requested amount of power; and (b) transferring energy from the energy storage device to the load at a rate such that a voltage of the energy storage device is regulated within a predetermined voltage range.

Abstract translation: 提供由前缘调光器驱动的电子变压器的负载和次级绕组之间的兼容性的方法和系统可以包括：（a）响应于确定来自电子变压器的能量可用，从 电子变压器，因此根据所要求的功率量将能量从电子变压器传输到能量存储装置; 和（b）以能够将能量存储装置的电压调节到规定的电压范围内的速度将能量从能量存储装置传递给负载。