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1. 发明申请

WO2018004610A1 MINIMIZING STARTUP TRANSIENTS IN AN AUDIO PLAYBACK PATH 审中-公开
标题翻译：最小化音频播放路径中的启动瞬态
公开(公告)号：WO2018004610A1
公开(公告)日：2018-01-04
申请号：PCT/US2016/040458
申请日：2016-06-30
申请人： CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR, LTD. , DAS, Tejasvi
发明人： DAS, Tejasvi , ILANGO, Anand
IPC分类号： H03F1/30 , H03F1/34 , H03F3/187 , H03F3/72 , H03M1/66
CPC分类号： H04R3/007 , H03F1/305 , H03F1/34 , H03F3/181 , H03F3/187 , H03F3/20 , H03F3/72 , H03F2200/03 , H03F2200/129 , H03F2200/381 , H03F2200/408 , H03G3/348 , H03M1/66
摘要： A method may be provided for powering up or down a playback path (9) comprising a digital-to-analog converter (14) for generating a non- ground-centered analog intermediate voltage (VIN) centered at a common-mode voltage and coupled to a driver (16) for generating a ground-centered playback path output voltage (VOUT) at an output of the driver (16) wherein the output of the driver is clamped via a finite impedance (30) to a ground voltage. The method may include transitioning continuously or in a plurality of discrete steps the analog intermediate voltage (VIN) from an initial voltage to the common- mode voltage such that the transitioning is substantially inaudible at the output (VOUT) of the driver (16). A method for operating an output clamp (30) of an output driver stage of a playback path (9) may include transitioning continuously or in a plurality of discrete steps an impedance (32) of the output clamp (30) in order to match an output offset of the output driver stage in order to minimize audio artifacts appearing at an output (VOUT) of the output driver stage (16).
摘要翻译：可以提供一种用于对包括数模转换器（14）的回放路径（9）通电或断电的方法，所述回放路径（9）用于生成以地为中心的非地面模拟中间电压（VIN）（16），用于在驱动器（16）的输出端处产生地心回放路径输出电压（VOUT），其中驱动器的输出经由有限阻抗（30）钳位在共模电压处并耦合到驱动器）接地电压。该方法可以包括将模拟中间电压（VIN）从初始电压连续地或者以多个离散步骤转变为共模电压，使得在驱动器（16）的输出（VOUT）处该转变基本上是不可听的。用于操作回放路径（9）的输出驱动器级的输出钳位器（30）的方法可以包括连续地或以多个离散步骤转变输出钳位器（30）的阻抗（32），以匹配输出驱动级的输出偏移，以便使出现在输出驱动级（16）的输出（VOUT）处的音频伪像最小化。

2. 发明申请

WO2017146761A1 IDENTIFICATION OF A LOAD WITH A SEARCH ALGORITHM THAT CONTROLS APPLICATION OF SIGNALS TO THE LOAD AND A REFERENCE GENERATOR 审中-公开
标题翻译：用负责控制负载信号的应用和参考发生器的搜索算法识别负载
公开(公告)号：WO2017146761A1
公开(公告)日：2017-08-31
申请号：PCT/US2016/039874
申请日：2016-06-28
申请人： CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD. , AGARWAL, Shatam , STORVIK, Alvin, Chuck , ILANGO, Anand , ALLEN, Daniel, John
发明人： AGARWAL, Shatam , STORVIK, Alvin, Chuck , ILANGO, Anand , ALLEN, Daniel, John
IPC分类号： H03M1/46 , H04R5/04
CPC分类号： H04R29/001 , H03M1/46 , H04R3/00 , H04R3/04 , H04R5/04 , H04R2420/05
摘要： An electronic device may be configured to identify a load coupled to the device. The device may measure direct current (DC) and/or alternating current (AC) characteristics of the load to identify the load. The device may then take action based on the identification of the load. For example, a specific transducer may be identified as coupled to the electronic device and an appropriate equalization curve applied to an audio output of the device. The measurement of characteristics of the load may include controlling a reference generator according to a search algorithm, such as a step ramp or binary search, to identify the load. An analog-to-digital converter (ADC) may operate through the search algorithm to provide feedback to digital circuitry regarding how to proceed through the search algorithm to identify the load.
摘要翻译：电子设备可以被配置为识别耦合到设备的负载。该设备可以测量负载的直流（DC）和/或交流（AC）特性以识别负载。设备然后可以基于负载的识别来采取行动。例如，特定换能器可以被识别为耦合到电子设备，并且适当的均衡曲线被应用于设备的音频输出。负载特性的测量可以包括根据搜索算法（例如，阶梯或二分搜索）来控制参考发生器以识别负载。模数转换器（ADC）可以通过搜索算法操作，以向数字电路提供关于如何通过搜索算法来识别负载的反馈。

3. 发明申请

WO2018118463A1 POWER-SAVING CURRENT-MODE DIGITAL-TO-ANALOG CONVERTER (DAC) 审中-公开
公开(公告)号：WO2018118463A1
公开(公告)日：2018-06-28
申请号：PCT/US2017/065411
申请日：2017-12-08
申请人： CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD. , PETERSON, Cory , ILANGO, Anand
发明人： PETERSON, Cory , ILANGO, Anand
IPC分类号： H03M1/10 , H03M1/68
摘要： A digital-to-analog converter (DAC) for an audio system in a media device, such as a portable media device or smart phone, may be operated to turn off portions of the DAC to reduce power consumption. Segments of a segment-able DAC may be powered off when the output level of the DAC is lower than the full scale output of the DAC. For example, DAC elements within a finite impulse response (FIR) DAC may be turned off when a desired output level can be obtained with less than all DAC elements of the FIR DAC.

4. 发明申请

WO2017146941A1 DIRECT CURRENT (DC) AND/OR ALTERNATING CURRENT (AC) LOAD DETECTION FOR AUDIO CODEC 审中-公开
标题翻译：用于音频编解码器的直流和/或交流电流（交流）负载检测
公开(公告)号：WO2017146941A1
公开(公告)日：2017-08-31
申请号：PCT/US2017/017832
申请日：2017-02-14
申请人： CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD. , AGARWAL, Shatam , ILANGO, Anand , STORVIK, Alvin, C. , PETERSON, Cory, J. , ALLEN, Daniel, J. , SATOSKAR, Aniruddha
发明人： AGARWAL, Shatam , ILANGO, Anand , STORVIK, Alvin, C. , PETERSON, Cory, J. , ALLEN, Daniel, J. , SATOSKAR, Aniruddha
IPC分类号： H03M1/46 , H04R5/04
CPC分类号： H04R29/001 , H03F3/181 , H03F2200/03 , H03F2200/222 , H03M1/46 , H03M1/66
摘要： A portable audio device may be configured to measure load characteristics of headphones. The device may measure direct current (DC) and/or alternating current (AC) characteristics of the load. These characteristics may be measured by an audio component, such as an audio codec chip or integrated circuit (IC) controller, and reported to software or firmware executing on a processor coupled to the audio component. The software or firmware may then take action based on the measured load characteristics. For example, the load characteristics may be compared to a database of headphones and their known load characteristics to determine a particular headphone model or type of headphone attached to the audio output. The processor may then apply an appropriate equalization curve.
摘要翻译：便携式音频设备可以被配置为测量耳机的负载特性。该设备可以测量负载的直流（DC）和/或交流（AC）特性。这些特征可以由诸如音频编解码器芯片或集成电路（IC）控制器之类的音频组件来测量，并且被报告给在耦合到音频组件的处理器上执行的软件或固件。然后软件或固件可以根据测得的负载特性采取行动。例如，负载特性可以与耳机的数据库和它们的已知负载特性进行比较，以确定附加到音频输出的特定耳机型号或耳机类型。处理器然后可以应用适当的均衡曲线。

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