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1. 发明授权

US10225652B2 Systems and methods for using a speaker as a microphone 有权
公开(公告)号：US10225652B2
公开(公告)日：2019-03-05
申请号：US15488872
申请日：2017-04-17
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , Eric Swanson
IPC分类号： H04R23/00 , H04R3/00 , H04R1/04 , H04W52/02 , H04R1/10 , H04R3/04 , H04R19/02 , H04R19/04
摘要： In accordance with methods and systems of the present disclosure, a mobile device may include an enclosure adapted such that the enclosure is readily transported by a user of the mobile device, a speaker associated with the enclosure for generating sound, and a controller within the enclosure, communicatively coupled to the speaker. The controller may be configured to receive a signal from the speaker, the signal induced at least in part by sound incident on the speaker other than sound generated by the speaker and process the signal.

2. 发明授权

US09634566B2 Controlling the common mode voltage of a non-isolated buck-boost converter 有权
公开(公告)号：US09634566B2
公开(公告)日：2017-04-25
申请号：US14612946
申请日：2015-02-03
申请人： Cirrus Logic, Inc.
发明人： Eric J. King , John L. Melanson
IPC分类号： H02M3/158 , H03F1/02 , H03F3/185 , H03F3/217 , H04R1/00 , H03F3/181
CPC分类号： H02M3/1582 , H02M3/1588 , H03F1/0227 , H03F3/181 , H03F3/217
摘要： A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based at least on an input signal to the switching power stage, determine the differential output voltage to be driven at the load, and based on the differential output voltage to be driven at the load, apply a switch configuration from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to generate the differential output voltage.

3. 发明授权

US09620101B1 Systems and methods for maintaining playback fidelity in an audio system with adaptive noise cancellation 有权
公开(公告)号：US09620101B1
公开(公告)日：2017-04-11
申请号：US14048485
申请日：2013-10-08
申请人： Cirrus Logic, Inc.
发明人： Bharath Kumar Thandri , Aniruddha Satoskar , Jeffrey D. Alderson , John L. Melanson
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K11/1785 , G10K2210/3212 , H02M3/07 , H03F1/0222 , H03F1/26 , H03F3/187 , H03F3/72 , H03F2200/507
摘要： An audio amplifier circuit may include a power amplifier, a charge pump power supply, and a control circuit. The power amplifier may have an audio input for receiving an audio input signal, an audio output for providing the output signal, and a power supply input. The charge pump power supply may provide a power supply voltage to the power supply input. The charge pump power supply may have a select input for selecting an operating mode of the power supply. In a first operating mode, the power supply voltage may equal to a first voltage, and in a second operating mode, the power supply voltage may be substantially equal to a second voltage which is a rational fraction of the first voltage. The control circuit may generate the select input based on a magnitude of anti-noise generated by an adaptive noise cancellation system associated with the audio transducer.

4. 发明授权

US09609701B2 Switch-mode drive sensing of reverse recovery in bipolar junction transistor (BJT)-based power converters 有权
公开(公告)号：US09609701B2
公开(公告)日：2017-03-28
申请号：US14634716
申请日：2015-02-27
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , Ramin Zanbaghi , Thirumalai Rengachari , Prashanth Drakshapalli , Rahul Singh , Arnab Kumar Dutta
IPC分类号： H05B37/02 , H05B33/08 , H02M3/335
CPC分类号： H05B33/0815 , H02M3/335 , H05B33/0845 , H05B33/0887 , H05B37/02
摘要： 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.

5. 发明授权

US09599977B1 Programmable system architecture for power controllers including thread execution responsive to power train event 有权
公开(公告)号：US09599977B1
公开(公告)日：2017-03-21
申请号：US14198076
申请日：2014-03-05
申请人： Cirrus Logic, Inc.
发明人： Jean C. Pina , John L. Melanson , Robert T. Grisamore , Eric J. King , Spencer Isaacson
IPC分类号： G05D3/12 , G05B19/042 , G05B19/05
CPC分类号： G05B19/054 , G05B19/0423 , G05B19/0428
摘要： A power train may have a power train input and a power train output, wherein the power train is configured to transfer electrical energy from the power train input to a load coupled to the power train output in conformity with one or more power train control signals. A scheduler may be configured to receive events from the power train and, responsive to each particular event, schedule execution of a thread of control instructions responsive to the particular event, wherein the thread is selected from a plurality of threads. A processor may be configured to execute the threads of control instructions scheduled by the scheduler, such that for each particular event the processor generates one or more power train control signals responsive to the particular event within a first switching cycle of receipt of the particular event or within a second switching cycle immediately subsequent to the first switching cycle.

6. 发明授权

US09335429B2 Low power analog-to-digital converter for sensing geophone signals 有权
标题翻译：用于感应地震检波器信号的低功耗模数转换器
公开(公告)号：US09335429B2
公开(公告)日：2016-05-10
申请号：US14636417
申请日：2015-03-03
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , Rahul Singh , Prashanth Drakshapalli , Dale Brummel , Stephen T. Hodapp
IPC分类号： H03M3/00 , G01V1/18
CPC分类号： G01V1/181 , H03M3/424 , H03M3/45 , H03M3/454
摘要： A low power analog-to-digital converter configured to sense sensor signals may include a loop filter and a feedback digital-to-analog converter. The loop filter may have a loop filter input configured to receive an input current signal from a sensor and generate an output signal responsive to the input current signal. The feedback digital-to-analog converter may have a feedback output configured to generate a current-mode or charge-mode feedback output signal responsive to the output signal, the feedback output coupled to the loop filter input in order to combine the input current signal and the feedback output signal at the input.
摘要翻译：被配置为感测传感器信号的低功率模数转换器可以包括环路滤波器和反馈数模转换器。环路滤波器可以具有环路滤波器输入，其被配置为从传感器接收输入电流信号，并响应于输入电流信号产生输出信号。反馈数模转换器可以具有被配置为响应于输出信号产生电流模式或电荷模式反馈输出信号的反馈输出，反馈输出耦合到环路滤波器输入，以便组合输入电流信号和输入端的反馈输出信号。

7. 发明授权

US09332345B1 Use of microphone capacitance as a switched capacitor in an input network of a delta-sigma modulator 有权
标题翻译：在Δ-Σ调制器的输入网络中使用麦克风电容作为开关电容
公开(公告)号：US09332345B1
公开(公告)日：2016-05-03
申请号：US14248035
申请日：2014-04-08
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , John C. Tucker
IPC分类号： H04R3/00 , H03M3/00 , H04R19/04
CPC分类号： 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
摘要： In accordance with embodiments of the present disclosure, a method and apparatus for providing a digitized microphone signal to a digital processing device may include an analog signal path portion, a digital signal path portion, and a control circuit. The analog signal path portion may have an audio input configured to receive an analog input signal indicative of audio sounds incident upon an audio transducer. The digital signal path portion may have an analog-to-digital converter for converting the analog microphone signal to the digitized microphone signal. The control circuit may be configured to control a magnitude of the analog input signal or a derivative thereof in order to reduce audio distortion occurring in either or both of the analog signal path portion and the digital signal path portion.
摘要翻译：根据本公开的实施例，用于向数字处理设备提供数字化麦克风信号的方法和设备可以包括模拟信号路径部分，数字信号路径部分和控制电路。模拟信号路径部分可以具有被配置为接收指示入射到音频换能器上的音频声音的模拟输入信号的音频输入。数字信号路径部分可以具有用于将模拟麦克风信号转换为数字化麦克风信号的模数转换器。控制电路可以被配置为控制模拟输入信号或其导数的幅度，以便减少在模拟信号路径部分和数字信号路径部分中的任一个或两者中发生的音频失真。

8. 发明申请

US20160080865A1 SYSTEMS AND METHODS FOR REDUCTION OF AUDIO ARTIFACTS IN AN AUDIO SYSTEM WITH DYNAMIC RANGE ENHANCEMENT 有权
标题翻译：在动态范围增强的音频系统中减少音频作品的系统和方法
公开(公告)号：US20160080865A1
公开(公告)日：2016-03-17
申请号：US14507372
申请日：2014-10-06
申请人： Cirrus Logic, Inc.
发明人： Ku He , Tejasvi Das , John L. Melanson
IPC分类号： H04R3/04 , H03G3/00
CPC分类号： H04R3/00 , H03G3/00 , H03G3/20 , H03G3/3005 , H03G3/3089 , H04R3/04 , H04R2430/00
摘要： 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.
摘要翻译：根据本公开的实施例，控制电路可以被配置为响应于在具有模拟路径部分的信号路径的增益模式和数字信号路径部分之间切换的指示，切换模拟的可选择的模拟增益在第一模拟增益和第二模拟增益之间的路径部分，在第一数字增益和第二数字增益之间切换数字信号路径部分的可选数字增益，其中第一模拟增益和第一数字增益的乘积近似等于第二模拟增益和第二数字增益的乘积，并且作为信号路径的增益模式之间的切换的结果，控制信号路径的模拟响应以减少存在于输出信号中的音频伪像的出现。信号路径可以具有模拟路径部分和数字信号路径部分。数字部分可以具有可选择的数字控制的增益，并且可以被配置为将数字音频输入信号转换成符合可选数字控制的增益的模拟输入信号，数字信号路径部分包括调制器，包括前向路径和反馈路径。正向路径可以包括环路滤波器，用于响应于数字音频输入信号和反馈信号产生经滤波的信号，响应于经滤波的信号产生量化信号的量化器，以及第一增益元件，被配置为将可选择的数字 - 控制增益到正向路径内的信号。反馈路径可以被配置为响应于量化信号产生反馈信号，反馈路径包括具有与可选数字控制增益成反比的增益的第二增益元件。

9. 发明申请

US20160056777A1 ENERGY-EFFICIENT PERSONAL AUDIO DEVICE OUTPUT STAGE WITH SIGNAL POLARITY-DEPENDENT POWER SUPPLY UPDATE RATE 审中-公开
标题翻译：具有信号极度相关电源更新速率的能源效率高的个人音频设备输出级
公开(公告)号：US20160056777A1
公开(公告)日：2016-02-25
申请号：US14929974
申请日：2015-11-02
申请人： Cirrus Logic, Inc.
发明人： Bharath Kumar Thandri , John L. Melanson
IPC分类号： H03F3/183 , H03F3/217 , H02M3/07 , H03F1/02
CPC分类号： H03F3/183 , H02M3/07 , H02M2003/071 , H02M2003/072 , H03F1/0211 , H03F1/0227 , H03F3/185 , H03F3/217 , H03F2200/03 , H03F2200/102
摘要： A charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide a first voltage or a second voltage in accordance with the select input. The charge pump power supply may have a signal polarity input for indicating a polarity of an output audio signal. Switches for switching one or more capacitors providing a first polarity voltage in a then-current operating mode may be configured to switch at a greater frequency than switches for switching one or more capacitors providing a second polarity voltage responsive to the signal polarity input indicating a positive polarity of the output audio signal. Switches for switching one or more capacitors providing the first polarity voltage in a then-current operating mode are configured to switch at a lesser frequency than switches for switching one or more capacitors providing the second polarity voltage responsive to the signal polarity input indicating a negative polarity of the output audio signal.
摘要翻译：电荷泵电源可以包括多个电容器和用于切换电容器以根据选择输入提供第一电压或第二电压的开关电路。电荷泵电源可以具有用于指示输出音频信号的极性的信号极性输入。用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关可以被配置为以比用于切换提供第二极性电压的一个或多个电容器的开关更大的频率切换，所述电容器响应于指示正的输出音频信号的极性。用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关被配置为响应于指示负极性的信号极性输入而以比用于切换提供第二极性电压的一个或多个电容器的开关更小的频率的输出音频信号。

10. 发明授权

US09240725B2 Coordinated dimmer compatibility functions 有权
公开(公告)号：US09240725B2
公开(公告)日：2016-01-19
申请号：US14102809
申请日：2013-12-11
申请人： Cirrus Logic, Inc.
发明人： John L. Melanson , Eric J. King
IPC分类号： G05F1/00 , H02M3/335 , H02M1/36 , H05B33/08 , H02M1/00
CPC分类号： H02M7/06 , H02M1/36 , H02M3/33507 , H02M2001/0006 , H05B33/0815 , Y02B20/346 , Y10T307/352 , Y10T307/50
摘要： A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii), control of switch mode power conversion and (iii) an inactive state to, for example, to allow a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), and (iii), the controller controls a power converter system that is compatible with a triac-based dimmer. In at least one embodiment, the controller coordinates functions (i), (ii), and (iii) in response to a particular dimming level indicated by a phase cut, rectified input voltage supplied to the power converter system.

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