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11.发明授权公开(公告)号：US10187025B1
公开(公告)日：2019-01-22
申请号：US14169349
申请日：2014-01-31
Applicant: Cirrus Logic, Inc.
Inventor： Jeffrey Allen May , Anu Chakravarty , John C. Tucker
Abstract: A predictive brownout prevention system may be configured to prevent brownout of an audio output signal. Particularly, the brownout prevention system may be configured to receive information indicative of an amplitude of the audio input signal, receive information indicative of a condition of the power supply, determine from the information indicative of an amplitude of the audio input signal and the information indicative of the condition of the power supply whether a brownout condition exists, and responsive to determining the brownout condition exists, generate the selectable attenuation signal to reduce an amplitude of the audio output signal such that the signal path attenuates the audio input signal or a derivative thereof in order to prevent brownout prior to propagation to the audio output of a portion of the audio input signal having the brownout condition.
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公开(公告)号：US10116215B2
公开(公告)日：2018-10-30
申请号：US14612889
申请日：2015-02-03
Applicant: Cirrus Logic, Inc.
Inventor： Eric Swanson , John L. Melanson , John C. Tucker , Eric J. King
Abstract: 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 on a measured parameter associated with the switching power stage, select a selected operational mode of the power converter from a plurality of operational modes, and sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from an input source of the power converter to the load in accordance with the selected operational mode.
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公开(公告)号：US09680488B2
公开(公告)日：2017-06-13
申请号：US15050857
申请日：2016-02-23
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , John L. Melanson , John C. Tucker , Xiaofan Fei
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.
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Patent Agency Ranking
公开(公告)号：US20170063318A1
公开(公告)日：2017-03-02
申请号：US15350431
申请日：2016-11-14
Applicant: Cirrus Logic, Inc.
Inventor： Ullas Pazhayaveetil , Jeffrey May , Anu Chakravarty , Gautham D. Kamath , John C. Tucker , Christian Larsen
CPC classification number: H02M3/158 , G01R21/06 , G01R27/2611 , G06F1/3203 , H02M3/156 , H03F3/187 , H03F3/2175 , H03G3/004
Abstract: Audio amplification may be improved by controlling an audio amplifier based on the audio signal being amplified. For example, when the audio signal level increases or decreases, a boost voltage provided to an audio amplifier by a boost converter may also be increased or decreased. In another example, when the audio signal level decrease below a certain level, the audio amplifier may be switched from amplifying the audio signal with a boost converter input to amplifying the audio signal with a low voltage input. Control of the audio amplifier may be implemented in a digital boost converter controller coupled to the boost converter and/or the audio amplifier.
Abstract translation: 可以通过基于被放大的音频信号控制音频放大器来改善音频放大。 例如，当音频信号电平增加或减小时，升压转换器提供给音频放大器的升压电压也可以增加或减小。 在另一示例中，当音频信号电平降低到低于某一水平时，可以利用升压转换器输入将音频放大器切换成放大音频信号，以便以低电压输入放大音频信号。 可以在耦合到升压转换器和/或音频放大器的数字升压转换器控制器中实现音频放大器的控制。
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15.发明授权公开(公告)号：US09571931B1
公开(公告)日：2017-02-14
申请号：US14247987
申请日：2014-04-08
Applicant: Cirrus Logic, Inc.
Inventor： John L. Melanson , John C. Tucker
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: To correct for non-linearities in the response of a microphone as a function of sound pressure level incident upon the microphone, a displacement non-linearity function is applied to the signal path of the microphone, wherein the displacement non-linearity function is a function of the digital audio output signal and has a response modeling non-linearities of the displacement as a function of a sound pressure level incident upon the microphone.
Abstract translation: 为了校正麦克风的响应中的非线性作为入射到麦克风的声压级的函数，位移非线性函数被施加到麦克风的信号路径，其中位移非线性函数是函数 的数字音频输出信号，并且具有作为入射到麦克风的声压级的函数的位移的非线性的响应建模。
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公开(公告)号：US09419562B1
公开(公告)日：2016-08-16
申请号：US14248054
申请日：2014-04-08
Applicant: Cirrus Logic, Inc.
Inventor： John L. Melanson , John C. Tucker
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: An amplifier may include a plurality of stages, wherein each stage may have an amplifier stage output configured to generate an amplifier output signal and a transistor coupled at its gate terminal to the amplifier input and to the gate terminals of the transistors of the other amplifier stages. Each stage may be configured to periodically and cyclically operate in an amplifier mode in which the amplifier stage generates at its corresponding amplifier stage output a power-amplified version of a signal received at the amplifier input and a in reset mode in which the transistor of the stage operating in the reset mode has an electrical property thereof reset. At any given time, at least one amplifier stage is operating in the amplifier mode. The amplifier may be configured to output as an output signal one of the amplifier output signals corresponding to an amplifier stage operating in the amplifier mode.
Abstract translation: 放大器可以包括多个级，其中每个级可以具有被配置为产生放大器输出信号的放大器级输出和在其栅极端耦合到放大器输入端和耦合到其它放大器级的晶体管的栅极端子的晶体管 。 每个级可以被配置为在放大器模式中周期性地和周期性地工作，其中放大器级在其相应的放大级产生输出在放大器输入处接收的信号的功率放大形式，在复位模式中， 在复位模式下工作的电平具有电性能的复位。 在任何给定时间，至少一个放大器级在放大器模式下工作。 放大器可以被配置为输出对应于以放大器模式工作的放大器级的放大器输出信号之一作为输出信号。
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17.发明授权公开(公告)号：US09325434B2
公开(公告)日：2016-04-26
申请号：US14276237
申请日：2014-05-13
Applicant: Cirrus Logic, Inc.
Inventor： John L. Melanson , John C. Tucker
CPC classification number: H04B15/04 , G05B15/02 , G05F1/14 , G06F1/08 , G06F3/165 , H04B2215/067 , H04B2215/068
Abstract: A mobile device may include a digital data driver and digital data receiver for communication of digital signals within the mobile device at a selected clock rate. The mobile device may also have a device external for the digital data driver and digital data receiver for communication of external signals, such as radio-frequency signals, to and from the mobile device. To avoid interference of frequency harmonics of a digital signal with such external signals, the digital data driver may be configured to control the digital signal based on the frequency of the external signals, such that interference of the external signal by spectral content of the digital signal is minimized, while maintaining the selected clock rate.
Abstract translation: 移动设备可以包括数字数据驱动器和数字数据接收器，用于以选定的时钟速率在移动设备内通信数字信号。 移动设备还可以具有用于数字数据驱动器的外部设备和数字数据接收器，用于将外部信号（例如射频信号）传送到移动设备和从移动设备通信。 为了避免数字信号与这种外部信号的频率谐波的干扰，数字数据驱动器可以被配置为基于外部信号的频率来控制数字信号，使得通过数字信号的频谱内容对外部信号的干扰 同时保持选定的时钟频率。
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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
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。
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