公开(公告)号：US20030231621A1

公开(公告)日：2003-12-18

申请号：US10379740

申请日：2003-03-05

Applicant: Cirrus Logic, Inc.

Inventor： Rajugopal R. Gubbi ,  Natarajan Ekambaram

IPC: H04L012/66 ,  H04J001/00

CPC classification number: H04W36/30 ,  H04B17/382 ,  H04L12/2803 ,  H04L2012/2841 ,  H04W72/08

Abstract: Communications within a computer network may be controlled by determining that conditions within a first communication channel communicatively coupling components of the computer network are becoming unacceptable for continued utilization of the communication channel and then switching communications within the computer network to a second communication channel. Interference conditions therein preferably being less severe than interference conditions within the first communication channel. The switching may initiated by one of the network components and generally includes placing communications within the first communication channel in a standby condition while searching for an available communication channel. This may be accomplished by instructing the components of the computer network to remain quiet while one of the components searches for an available communication channel, for example by tuning an associated radio to listen in the second communication channel. Ultimately, network communications may be established in the second communication channel. This may include setting up bandwidth connection agreements with each of the components of the computer network for the second communication channel and/or polling for each of the components of the computer network in the second communication channel.

Abstract translation: 计算机网络内的通信可以通过确定通信地耦合计算机网络的组件的第一通信信道中的条件变得不可接受，以便继续利用通信信道，然后将计算机网络内的通信切换到第二通信信道。 干扰条件优选地不如第一通信信道内的干扰条件严重。 切换可以由网络组件中的一个发起，并且通常包括在寻找可用的通信信道的同时在待机状态下将通信置于第一通信信道内。 这可以通过指示计算机网络的组件保持安静，而其中一个组件搜索可用通信信道，例如通过调谐相关联的无线电来收听第二通信信道来实现。 最终，可以在第二通信信道中建立网络通信。 这可以包括与用于第二通信信道的计算机网络的每个组件建立带宽连接协议和/或轮询第二通信信道中的计算机网络的每个组件。

公开(公告)号：US20030196130A1

公开(公告)日：2003-10-16

申请号：US10424397

申请日：2003-04-28

Applicant: Cirrus Logic, Inc.

Inventor： Douglas F. Pastorello

IPC: G06F001/12

CPC classification number: G06F13/4291

Abstract: Byte synchronization between a bus master and a serial interface or other bus slave is maintained and promptly corrected by using a unique signal, issued by the serial interface, to promptly and unambiguously notify the bus master of a loss of synchronization, followed by prompt resynchronization by the bus master. The serial interface sets a selected indicium in a status register equal to a selected value, when an invalid command is sensed at the interface. The bus master reads the status register and, when the selected indicium has the selected value, promptly resynchronizes the serial interface without further delay.

Abstract translation: 总线主机和串行接口或其他总线从站之间的字节同步通过使用由串行接口发出的唯一信号进行维护并及时纠正，以及时，明确地通知总线主机失去同步，然后立即重新同步 总线主人。 串行接口在接口上检测到无效命令时，将状态寄存器中的选定标记设置为等于所选值。 总线主控器读取状态寄存器，当所选标记具有所选值时，会立即重新同步串行接口，而不会再延迟。

公开(公告)号：US20030121011A1

公开(公告)日：2003-06-26

申请号：US10352591

申请日：2003-01-28

Applicant: Cirrus Logic, Inc.

Inventor： Hamilton B. Carter

IPC: G06F017/50

CPC classification number: G01R31/318314 ,  G01R31/31835 ,  G01R31/318357 ,  G06F17/5022

Abstract: Coverage metrics are expressed with an intuitive graphical interface based upon data flow. Coverage analysis and presentation objects are integrated to produce coverage results which enable device functionality in a device under test to be modeled as objects, subject to event occurrence. Event objects are introspected at run-time, allowing the user to determine the event object's attributes with specification of coverage metrics subject to a selected combination of the event object's attributes. The event objects are serialized into permanent storage, allowing the user to specify and execute new coverage metrics at any time after simulation. Operations used to describe coverage metrics are modeled as analysis objects. Such analysis objects accept event objects as inputs, using a predetermined, well-defined interface. The combination of event objects and analysis objects allows coverage metrics to be specified in a simple data flow manner. With such a coverage metric, the user attaches or wires (metaphorically) the analysis objects together in a visual builder environment. Using the analysis objects, the user specifies desired coverage metrics, such as coverage of sequences of events and/or coverage of events that occur during the same time window of a simulation. The display functionality of the coverage tool is expandable because the presentation objects use the same event object interface as the analysis operator objects. Coverage metrics are subject to specification either before or after event occurrence. The user specifies coverage metrics using an intuitive graphical interface based upon data flow, without any specific programming language skills being necessary. Functional events in the device under test are treated as event objects. Each event object may be passed to selected analysis tools chosen by the user, such as analyzers, logic gates, and coincidence counters.

Abstract translation: 覆盖指标用基于数据流的直观图形界面表示。 覆盖分析和呈现对象被集成以产生覆盖结果，使得被测设备中的设备功能被建模为对象，受到事件的发生。 事件对象在运行时被内省，允许用户根据事件对象属性的选定组合来确定覆盖度量的规范来确定事件对象的属性。 事件对象被序列化为永久存储，允许用户在模拟之后随时指定和执行新的覆盖度量。 用于描述覆盖度量的操作被建模为分析对象。 这样的分析对象使用预定的，良好定义的界面来接受事件对象作为输入。 事件对象和分析对象的组合允许以简单的数据流方式指定覆盖度量。 通过这样的覆盖度量，用户将分析对象在视觉构建器环境中连接或连接（比喻）。 使用分析对象，用户指定期望的覆盖度量，例如在模拟的相同时间窗口期间发生的事件序列的覆盖和/或事件覆盖。 覆盖工具的显示功能是可扩展的，因为呈现对象使用与分析运算符对象相同的事件对象接口。 覆盖指标在事件发生之前或之后受制于规范。 用户使用基于数据流的直观图形界面来指定覆盖度量，而不需要任何特定的编程语言技能。 被测设备中的功能事件被视为事件对象。 每个事件对象可以被传递给用户所选择的分析工具，例如分析器，逻辑门和重合计数器。

公开(公告)号：US20020097860A1

公开(公告)日：2002-07-25

申请号：US09767545

申请日：2001-01-22

Applicant: Cirrus Logic, Inc.

Inventor： Manoj Soman ,  Sachin Ghanekar ,  Rajendra Datar

IPC: H04M001/00 ,  H04M003/00

CPC classification number: H04Q1/4575

Abstract: A method of detecting frequency errors exceeding a predetermined limit in a sampled signal includes the step of determining a peak amplitude of the signal at a tone frequency for a first frame of samples of the sampled signals using a filter having a first amplitude versus frequency response. A peak amplitude of signal at the tone frequency is determined for a second frame of samples of the sampled signal using a filter having a second amplitude versus frequency response. A ratio between the peak amplitude of the first frame and the peak amplitude of the second frame is calculated and compared against a threshold to detect frequency errors exceeding the predetermined limit. Among other things, this method decouples the frequency error detection problem from the twist factor estimation problem.

Abstract translation: 一种在采样信号中检测超过预定极限的频率误差的方法包括以下步骤：使用具有第一幅度对频率响应的滤波器，确定采样信号的第一采样帧采样频率处的信号的峰值幅度。 使用具有第二幅度对频率响应的滤波器，对采样信号的第二采样帧确定音调频率处的信号的峰值幅度。 计算第一帧的峰值振幅与第二帧的峰值振幅之间的比率，并将其与阈值进行比较，以检测超过预定极限的频率误差。 除此之外，这种方法将频率误差检测问题与扭转因子估计问题相分离。

公开(公告)号：US20020094091A1

公开(公告)日：2002-07-18

申请号：US09764200

申请日：2001-01-17

Applicant: Cirrus Logic, Inc.

Inventor： Xiaomin Wu ,  Joseph Jason Welser ,  Krishnan Subramaniam

IPC: H04R029/00 ,  H04R003/00

CPC classification number: H03F3/181 ,  H03F2203/7236 ,  H03G3/348

Abstract: Circuitry for ramping a voltage across a load 506 includes a charging circuit 500 for charging a capacitor 501 to generate a ramp-up wave form. Circuitry 511 selectively decouples a first driver 510 from load 506 during a ramping up mode and couples first driver 510 to load 506 during a normal operating mode. Ramp up driver 507a is selectively coupled to the load 506 during the ramp-up mode for ramping up the voltage across load 506 in response to the ramp-up wave form generated by charging circuitry 500. A discharge circuit 503d, 514a,b discharges capacitor 501 to generate a power-down wave form. Circuitry 511 selectively decouples a first driver 501 from output load 506 during the ramping down of the voltage across output load 506. A ramp-down driver 507b selectively ramps-down the voltage across output load 506 in response to the ramp-down wave form generated by discharge circuitry 503d, 514a,b.

Abstract translation: 用于使负载506上的电压斜升的电路包括用于对电容器501充电以产生斜升波形的充电电路500。 电路511在升降模式期间选择性地将第一驱动器510与负载506分离，并且在正常操作模式期间将第一驱动器510耦合到负载506。 斜坡上升驱动器507a在斜坡上升模式期间选择性地耦合到负载506，以响应于由充电电路500产生的斜升波形而升高负载506上的电压。放电电路503d，514a，b放电电容器 501产生掉电波形。 电路511在跨越输出负载506的电压下降期间选择性地将第一驱动器501与输出负载506分离。斜坡下降驱动器507b响应于产生的斜降波形而选择性地斜升输出负载506两端的电压 通过放电电路503d，514a，b。

公开(公告)号：US20020069379A1

公开(公告)日：2002-06-06

申请号：US09730091

申请日：2000-12-05

Applicant: Cirrus Logic, Inc.

Inventor： David E. Reed ,  Stephen A. Turk ,  Li Du

IPC: G06F011/00

CPC classification number: G11B5/5543 ,  G11B5/59633

Abstract: Servo circuitry is disclosed that is configured to operate with a magnetic disk drive system. The servo circuitry is comprised of a first servo detector system, a second servo detector system, and a comparator. The first servo detector system and the second servo detector system each receive samples, taken from a read signal, that include servo data. The first servo detector system compares the samples to a plurality of servo codes to generate a first selected code. The second servo detector system compares a first shifted version of the samples to the plurality of servo codes to generate a second selected code. The comparator receives the selected codes and selects one of the selected codes. The selected code represents the servo data. The servo circuitry could also include a third servo detector system that operates on a second shifted version of the samples. Alternatively, the first servo detector system, the second servo detector system, and the third servo detector system could each be programmed with different servo codes. The first servo detector system compares the samples to a plurality of first servo codes. The second servo detector system compares the samples to a plurality of second servo codes. The third servo detector system compares the samples to a plurality of third servo codes. The second servo codes and the third servo codes are shifted versions of the first servo codes. In either embodiment, the servo circuitry advantageously has improved phase shift tolerance.

Abstract translation: 公开了配置为利用磁盘驱动系统进行操作的伺服电路。 伺服电路包括第一伺服检测器系统，第二伺服检测器系统和比较器。 第一伺服检测器系统和第二伺服检测器系统每个从包括伺服数据的读取信号中接收采样。 第一伺服检测器系统将样本与多个伺服码进行比较以产生第一选择的码。 第二伺服检测器系统将样本的第一移位版本与多个伺服码进行比较，以产生第二选择的码。 比较器接收所选择的代码并选择所选代码之一。 所选代码表示伺服数据。 伺服电路还可以包括在样本的第二移位版本上操作的第三伺服检测器系统。 或者，第一伺服检测器系统，第二伺服检测器系统和第三伺服检测器系统可以各自用不同的伺服代码进行编程。 第一伺服检测器系统将样本与多个第一伺服码进行比较。 第二伺服检测器系统将样本与多个第二伺服码进行比较。 第三伺服检测器系统将样本与多个第三伺服码进行比较。 第二伺服代码和第三伺服代码是第一伺服代码的移位版本。 在任一实施例中，伺服电路有利地具有改进的相移公差。

公开(公告)号：US5668678B1

公开(公告)日：2000-11-28

申请号：US32584294

申请日：1994-11-14

Applicant: CIRRUS LOGIC INC

Inventor： REED DAVID E ,  BEHERNS RICHARD T ,  BLISS WILLIAM G

IPC: G11B5/596 ,  G11B21/08 ,  G11B21/10 ,  G11B5/09

CPC classification number: G11B21/083 ,  G11B5/59655 ,  G11B5/59688 ,  G11B20/10037 ,  G11B20/10055 ,  G11B21/085 ,  G11B21/106

公开(公告)号：US10571484B2

公开(公告)日：2020-02-25

申请号：US14686834

申请日：2015-04-15

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Anindya Bhattacharya ,  Roderick D. Holley ,  Ruoxin Jiang ,  Stephen T. Hodapp ,  John C. Tucker

IPC: G01P15/125

Abstract: In accordance with embodiments of the present disclosure, an apparatus for measuring acceleration may include a spring-mounted mass, a positional encoder configured to measure a position of the spring-mounted mass and output one or more signals indicative of a sine and a cosine of the position, a driver to set and maintain an oscillation of the spring-mounted mass, and a decoder configured to process the one or more signals to calculate an acceleration of the spring-mounted mass.

公开(公告)号：US10382864B2

公开(公告)日：2019-08-13

申请号：US14101777

申请日：2013-12-10

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey D. Alderson ,  Jon D. Hendrix

IPC: H04R3/04 ,  G10K11/178

Abstract: In accordance with systems and methods of the present disclosure, a method may include receiving an error microphone signal indicative of an acoustic output of a transducer and ambient audio sounds at the acoustic output of the transducer. The method may also include generating an anti-noise signal to reduce the presence of the ambient audio sounds at the acoustic output of the transducer based at least on the error microphone signal. The method may further include generating an equalized source audio signal from a source audio signal by adapting, based at least on the error microphone signal, a response of the adaptive playback equalization system to minimize a difference between the source audio signal and the error microphone signal. The method may additionally include combining the anti-noise signal with the equalized source audio signal to generate an audio signal provided to the transducer.

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

IPC: G06F1/32 ,  H03G3/20

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.