公开(公告)号：US09318090B2

公开(公告)日：2016-04-19

申请号：US13729141

申请日：2012-12-28

Applicant: Cirrus Logic, Inc.

Inventor： Dayong Zhou ,  Yang Lu ,  Jon D. Hendrix ,  Jeffrey Alderson ,  Antonio John Miller ,  Chin Yong ,  Gautham Devendra Kamath

IPC: G10K11/16 ,  H03B29/00 ,  G10K11/178

CPC classification number: G10K11/175 ,  G10K11/16 ,  G10K11/178 ,  G10K2210/00 ,  G10K2210/108 ,  G10K2210/3011 ,  G10K2210/30231 ,  G10K2210/3028 ,  G10K2210/30351 ,  G10K2210/503

Abstract: An adaptive noise canceling (ANC) circuit adaptively generates an anti-noise signal from a reference microphone signal that is injected into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone proximate the speaker provides an error signal. A secondary path estimating adaptive filter estimates the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Tones in the source audio, such as remote ringtones, present in downlink audio during initiation of a telephone call, are detected by a tone detector using accumulated tone persistence and non-silence hangover counting, and adaptation of the secondary path estimating adaptive filter is halted to prevent adapting to the tones. Adaptation of the adaptive filters is then sequenced so any disruption of the secondary path adaptive filter response is removed before allowing the anti-noise generating filter to adapt.

Abstract translation: 自适应噪声消除（ANC）电路自适应地从注入扬声器或其它换能器输出的参考麦克风信号产生抗噪声信号，以引起环境声音的消除。 靠近扬声器的错误麦克风提供了错误信号。 二次路径估计自适应滤波器估计从噪声消除电路通过换能器的电声路径，从而可以从误差信号中去除源音频。 在开始电话呼叫期间存在于下行链路音频中的源音频中的音调（例如远程铃声）由使用累积的音调持续性和非静音宿醉计数的音调检测器检测，并且停止辅助路径估计自适应滤波器的适配 以防止适应色调。 然后对自适应滤波器的适应进行排序，因此在允许抗噪声产生滤波器适应之前，去除二次路径自适应滤波器响应的任何中断。

公开(公告)号：US09306588B2

公开(公告)日：2016-04-05

申请号：US14680830

申请日：2015-04-07

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  John L. Melanson ,  John C. Tucker ,  Xiaofan Fei

IPC: H03M1/66 ,  H03M1/00 ,  H03M1/08 ,  H03M1/78 ,  H03M1/70 ,  H03M1/68

CPC classification number: H03M1/002 ,  H03M1/0845 ,  H03M1/66 ,  H03M1/662 ,  H03M1/68 ,  H03M1/70 ,  H03M1/785 ,  H03M3/32 ,  H03M3/392 ,  H03M3/414 ,  H03M3/416 ,  H03M3/50

Abstract: In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths including a first processing path and a second processing path, a digital-to-analog stage output, and a controller. The first processing path may include a first digital-to-analog converter for converting the digital input signal into a first intermediate analog signal, the first digital-to-analog converter configured to operate in a high-power state and a low-power state. The second processing path may include a second digital-to-analog converter for converting a digital input signal into a second intermediate analog signal. The digital-to-analog stage output may be configured to generate an analog signal comprising a sum of the first intermediate analog signal and the second intermediate analog signal. The controller may be configured to operate the first digital-to-analog converter in the lower-power state when a magnitude of the digital input signal is below a threshold magnitude.

Abstract translation: 根据本公开的实施例，处理系统可以包括多个处理路径，包括第一处理路径和第二处理路径，数模转换阶段输出和控制器。 第一处理路径可以包括用于将数字输入信号转换成第一中间模拟信号的第一数模转换器，第一数模转换器被配置为在大功率状态和低功率状态 。 第二处理路径可以包括用于将数字输入信号转换成第二中间模拟信号的第二数模转换器。 数模转换级输出可以被配置为产生包括第一中间模拟信号和第二中间模拟信号之和的模拟信号。 控制器可以被配置为当数字输入信号的幅度低于阈值大小时，在较低功率状态下操作第一数模转换器。

公开(公告)号：US20160080862A1

公开(公告)日：2016-03-17

申请号：US14483659

申请日：2014-09-11

Applicant: Cirrus Logic, Inc.

Inventor： Ku He ,  Tejasvi Das ,  John L. Melanson

IPC: H04R3/00 ,  H03G3/20

CPC classification number: H04R3/00 ,  H03G3/00 ,  H03G3/20 ,  H03G3/3005 ,  H03G3/3089 ,  H04R3/04 ,  H04R2430/00

Abstract: In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.

公开(公告)号：US20160063988A1

公开(公告)日：2016-03-03

申请号：US14840831

申请日：2015-08-31

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Ali Abdollahzadeh Milani ,  Nitin Kwatra ,  Dayong Zhou ,  Yang Lu ,  Jeffrey Alderson

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/1784 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/3045 ,  G10K2210/3216 ,  G10K2210/3226 ,  G10K2210/504 ,  H04R1/1083 ,  H04R2460/01 ,  H04R2499/11

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to measure the ambient sounds and transducer output near the transducer, thus providing an indication of the effectiveness of the noise canceling. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether the ANC circuit is incorrectly adapting or may incorrectly adapt to the instant acoustic environment and/or whether the anti-noise signal may be incorrect and/or disruptive and then take action in the processing circuit to prevent or remedy such conditions.

Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以引起取消 的环境音频声音。 在扬声器附近还提供误差麦克风以测量传感器附近的环境声音和换能器输出，从而提供噪声消除的有效性的指示。 处理电路使用参考和/或误差麦克风，可选地连同提供用于捕获近端语音的麦克风，以确定ANC电路是否不正确地适配或可能不正确地适应于即时声学环境和/ 噪声信号可能不正确和/或破坏，然后在处理电路中采取行动，以防止或补救这些条件。

公开(公告)号：US09277624B1

公开(公告)日：2016-03-01

申请号：US13889952

申请日：2013-05-08

Applicant: Cirrus Logic, Inc.

Inventor： Wesley L. Mokry ,  Michael A. Kost ,  Eric J. King

IPC: H05B37/00 ,  H05B37/02

CPC classification number: H05B37/02 ,  H02M1/36 ,  H02M7/217 ,  H02M2001/0045 ,  H05B33/0812 ,  Y02B20/343

Abstract: In accordance with embodiments of the present disclosure, a system and method for providing compatibility between a load having a reactive impedance during steady-state operation and a secondary winding of an electronic transformer driven by a leading-edge dimmer may include a first circuit and a second circuit. The first circuit may cause the load to have a substantially non-reactive impedance when the first circuit is enabled. The second circuit may enable the first circuit to cause the load to have the substantially non-reactive impedance during a duration of time following start-up of the electronic transformer and disable the first circuit after the duration such that the load has the reactive impedance during steady-state operation of the load.

公开(公告)号：US20160056808A9

公开(公告)日：2016-02-25

申请号：US14104137

申请日：2013-12-12

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  John L. Melanson

IPC: H03K17/13 ,  H05B33/08

CPC classification number: H03K17/13 ,  H05B33/0815 ,  H05B33/0845 ,  Y02B20/346

Abstract: In at least one embodiment, the controller senses a leading edge, phase cut AC input voltage value to a switching power converter during a cycle of the AC input voltage. The controller senses the voltage value at a time prior to a zero crossing of the AC input voltage and utilizes the voltage value to determine the approximate zero crossing. In at least one embodiment, by determining an approximate zero crossing of the AC input voltage, the controller is unaffected by any disturbances of the dimmer that could otherwise make detecting the zero crossing problematic. The particular way of determining an approximate zero crossing is a matter of design choice. In at least one embodiment, the controller approximates the AC input voltage using a function that estimates a waveform of the AC input voltage and determines the approximate zero crossing of the AC input voltage from the approximation of the AC input voltage.

公开(公告)号：US09264808B2

公开(公告)日：2016-02-16

申请号：US13917843

申请日：2013-06-14

Applicant: Cirrus Logic, Inc.

Inventor： Dayong Zhou ,  Yang Lu

IPC: G10K11/178 ,  H04R3/00

CPC classification number: H04R3/005 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/503 ,  H04R2460/01 ,  H04R2499/11

Abstract: In accordance with methods and systems of the present disclosure, an integrated circuit for implementing at least a portion of a personal audio device may include an output including an anti-noise signal, a reference microphone input, an error microphone input, and a processing circuit. The processing circuit may implement an adaptive filter having a response that generates the anti-noise signal from the reference microphone signal to reduce the presence of the ambient audio sounds heard by the listener, wherein the processing circuit may implement a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal and the reference microphone signal by adapting the response of the adaptive filter in accordance with a calculated narrow-band-to-full-band ratio, wherein the narrow-band-to-full-band ratio is a function of a narrow-band power of the reference microphone signal divided by a full-band power of the reference microphone signal.

Abstract translation: 根据本公开的方法和系统，用于实现个人音频设备的至少一部分的集成电路可以包括包括抗噪声信号，参考麦克风输入，误差麦克风输入和处理电路的输出 。 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，以减少由收听者听到的环境音频声音的存在，其中处理电路可以实现一个系数控制块， 通过根据计算的窄带到全带比调整自适应滤波器的响应，自适应滤波器的响应与误差麦克风信号和参考麦克风信号一致，其中窄带到满 带比是参考麦克风信号的窄带功率除以参考麦克风信号的全频带功率的函数。

公开(公告)号：US09252764B1

公开(公告)日：2016-02-02

申请号：US13795975

申请日：2013-03-12

Applicant: Cirrus Logic, Inc.

Inventor： Dan Shen ,  Lingli Zhang ,  Johann Gaboriau

IPC: H03K3/00 ,  H03K17/16

CPC classification number: H03K17/165

Abstract: In accordance with embodiments of the present disclosure, an apparatus may include an input for indicating a characteristic of an output load current of a switched output stage comprising at least one driver device and a predriver circuit coupled to the input and a gate terminal of the at least one driver device, the predriver circuit for driving an input voltage signal to the gate terminal and configured to select an effective impedance of the gate terminal based on the input for indicating the output load current. In accordance with these and other embodiments of the disclosure, a method may include receiving an input for indicating a characteristic of an output load current of a switched output stage comprising at least one driver device and selecting an effective impedance of a gate terminal of the at least one driver device based on the input for indicating the output load current.

Abstract translation: 根据本公开的实施例，装置可以包括用于指示切换输出级的输出负载电流的特性的输入，包括至少一个驱动器装置和耦合到输入的预驱动电路以及耦合到at 至少一个驱动器装置，用于将输入电压信号驱动到栅极端子的预驱动电路，并且被配置为基于用于指示输出负载电流的输入来选择栅极端子的有效阻抗。 根据本公开的这些和其他实施例，一种方法可以包括接收用于指示切换输出级的输出负载电流的特性的输入，该输出负载电流包括至少一个驱动器器件，并且选择一个门极端子的有效阻抗 基于用于指示输出负载电流的输入的至少一个驱动器装置。

公开(公告)号：US09230532B1

公开(公告)日：2016-01-05

申请号：US13794931

申请日：2013-03-12

Applicant: Cirrus Logic, Inc.

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

IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  G10K11/178

CPC classification number: G10K11/178 ,  G10K11/16 ,  G10K2210/1081 ,  G10K2210/503 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01 ,  H04R2499/11

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from an output of a microphone that measures ambient audio. The anti-noise signal is combined with source audio to provide an output for a speaker. The anti-noise signal causes cancellation of ambient audio sounds that appear at the microphone. A processing circuit estimates a level of background noise from the microphone output and sets a power conservation mode of the personal audio device in response to detecting that the background noise level is lower than a predetermined threshold.

Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从测量环境音频的麦克风的输出产生抗噪声信号。 抗噪声信号与源音频相结合，为扬声器提供输出。 抗噪声信号会导致麦克风出现的环境音频声音的消除。 响应于检测到背景噪声水平低于预定阈值，处理电路估计来自麦克风输出的背景噪声的水平并设置个人音频设备的功率节省模式。

公开(公告)号：US20150381130A1

公开(公告)日：2015-12-31

申请号：US14467969

申请日：2014-08-25

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  Ku He ,  John L. Melanson

IPC: H03G3/20 ,  H04R3/02

CPC classification number: H04R3/02 ,  H03G3/001 ,  H03G3/002 ,  H03G3/3005 ,  H03G3/3026 ,  H03M1/70 ,  H04R2430/01

Abstract: In accordance with embodiments of the present disclosure, an apparatus for providing an output signal to an audio transducer may include a control circuit. The control circuit may be configured to predict, based on a magnitude of a signal indicative of the output signal, an occurrence of an event for changing a selectable digital gain and a selectable analog gain and an audio signal path, and responsive to predicting the occurrence of the event, change, at an approximate time in which a zero crossing of the signal indicative of the output signal occurs, the selectable digital gain and the selectable analog gain.

Abstract translation: 根据本公开的实施例，用于向音频换能器提供输出信号的装置可以包括控制电路。 控制电路可以被配置为基于指示输出信号的信号的大小来预测用于改变可选数字增益和可选择的模拟增益和音频信号路径的事件的发生，并且响应于预测发生 在发生指示输出信号的信号的零交叉的近似时间，可选择的数字增益和可选择的模拟增益之​​间改变事件。