DIGITAL PULSE WIDTH MODULATION FOR HALF BRIDGE AMPLIFIERS
    1.
    发明申请
    DIGITAL PULSE WIDTH MODULATION FOR HALF BRIDGE AMPLIFIERS 有权
    用于半桥式放大器的数字脉冲宽度调制

    公开(公告)号:US20100109767A1

    公开(公告)日:2010-05-06

    申请号:US12262127

    申请日:2008-10-30

    IPC分类号: H03F3/38 H03F3/217

    CPC分类号: H03F3/217

    摘要: A switching amplifier drives a load or audio transducer. A digital integral noise shaping circuit converts a digital input such as audio content to an output digital pulse width modulated signal using an integrator. The integrator integrates the digital input, a variable frequency reference pulse width modulated signal and an inverse of the output digital pulse width modulated signal. A half bridge amplifier receives the output digital pulse width modulated signal and drives the load or audio transducer. A variable frequency generator generates the variable frequency reference pulse width modulated signal with an approximately equal duty ratio or alternatively varies the variable frequency pulse width modulated signal above and below about a fifty percent duty ratio.

    摘要翻译: 开关放大器驱动负载或音频传感器。 数字积分噪声整形电路使用积分器将诸如音频内容的数字输入转换为输出数字脉宽调制信号。 积分器将数字输入,可变频率参考脉冲宽度调制信号和输出数字脉宽调制信号的反相相结合。 半桥放大器接收输出数字脉宽调制信号并驱动负载或音频传感器。 可变频率发生器以大致相等的占空比产生可变频率参考脉冲宽度调制信号,或者可选地改变高于和低于约百分之五十占空比的可变频率脉宽调制信号。

    Method and system for analog to digital conversion using digital pulse width modulation (PWM)
    2.
    发明授权
    Method and system for analog to digital conversion using digital pulse width modulation (PWM) 有权
    使用数字脉宽调制(PWM)模数转换的方法和系统

    公开(公告)号:US06965339B2

    公开(公告)日:2005-11-15

    申请号:US10819644

    申请日:2004-04-07

    IPC分类号: H03M1/12 H03M1/34 H03M3/02

    CPC分类号: H03M3/00

    摘要: A system and method for analog-to-digital conversion using digital pulse width modulation (PWM) is disclosed. The method and system according to the disclosed invention converts an analog input signal to a digital signal in pulse code modulated (PCM) form. The disclosed invention uses a feedback circuit to perform PWM of the analog input signal. The PWM signal is then decimated to obtain the digital signal in PCM form. The system according to the disclosed invention requires lower operating frequency and dissipates lesser power than prior art systems providing the same sampling frequency and resolution. The operation at a lower frequency is achieved by obtaining two samples from every pulse of the PWM signal; the first sample being obtained from the right duty ratio, and the second sample being obtained form the left duty ratio. Further, the disclosed invention has lesser implementation complexity and higher signal-to-noise ratio than prior art.

    摘要翻译: 公开了一种使用数字脉宽调制(PWM)进行模数转换的系统和方法。 根据所公开的发明的方法和系统将模拟输入信号转换成脉冲编码调制(PCM)形式的数字信号。 所公开的发明使用反馈电路来执行模拟输入信号的PWM。 然后抽取PWM信号以获得PCM形式的数字信号。 根据所公开的发明的系统需要更低的工作频率并且消耗比提供相同采样频率和分辨率的现有技术系统更小的功率。 通过从PWM信号的每个脉冲获得两个采样来实现较低频率的操作; 从正确的占空比获得第一个样品,并且从左占空比获得第二个样品。 此外,所公开的发明比现有技术具有较小的实现复杂度和更高的信噪比。

    Asynchronous Error Correction Circuit for Switching Amplifier
    3.
    发明申请
    Asynchronous Error Correction Circuit for Switching Amplifier 审中-公开
    开关放大器异步纠错电路

    公开(公告)号:US20090261902A1

    公开(公告)日:2009-10-22

    申请号:US12104874

    申请日:2008-04-17

    IPC分类号: H03F3/217

    CPC分类号: H03F3/217

    摘要: A circuit (104, 106) includes a comparison circuit (202, 504, 506, 602) and a correction circuit (204, 508, 510, 604). The comparison circuit provides a comparison signal (212, 524, 526, 612) in response to an error value (210, 520, 522, 610) and a reference value (214). The error value is based on a pulse modulated input signal (114) and a pulse modulated output signal (118). The correction circuit asynchronously provides a corrected pulse modulated signal (116) by selectively delaying and advancing an edge of the pulse modulated input signal based on the comparison signal. The pulse modulated output signal is based on the corrected pulse modulated signal.

    摘要翻译: 电路(104,106)包括比较电路(202,504,506,602)和校正电路(204,508,510,604)。 比较电路响应于错误值(210,520,522,610)和参考值(214)提供比较信号(212,524,526,612)。 误差值基于脉冲调制输入信号(114)和脉冲调制输出信号(118)。 校正电路通过基于比较信号选择性地延迟和前进脉冲调制输入信号的边沿来异步地提供校正的脉冲调制信号(116)。 脉冲调制输出信号基于经校正的脉冲调制信号。

    Continuous time noise shaping analog-to-digital converter
    4.
    发明授权
    Continuous time noise shaping analog-to-digital converter 有权
    连续时间噪声整形模数转换器

    公开(公告)号:US07352311B2

    公开(公告)日:2008-04-01

    申请号:US11507919

    申请日:2006-08-22

    IPC分类号: H03M3/00

    CPC分类号: H03M3/432

    摘要: A system for a continuous time noise shaping analog-to-digital converter (“ADC”) with a suppressed carrier pulse width modulated (“PWM”) quantizer is disclosed. In particular, a suppressed carrier feedback signal may expand the dynamic range of a sigma delta modulated ADC and enhance the stability of the noise shaping loop.

    摘要翻译: 公开了一种具有抑制载波脉宽调制(“PWM”)量化器的连续时间噪声整形模数转换器(“ADC”)的系统。 特别地,抑制的载波反馈信号可以扩展Σ-Δ调制ADC的动态范围,并增强噪声整形环路的稳定性。

    CONTINUOUS TIME NOISE SHAPING ANALOG-TO-DIGITAL CONVERTER
    5.
    发明申请
    CONTINUOUS TIME NOISE SHAPING ANALOG-TO-DIGITAL CONVERTER 有权
    连续时间噪声形成模拟数字转换器

    公开(公告)号:US20080048898A1

    公开(公告)日:2008-02-28

    申请号:US11507919

    申请日:2006-08-22

    IPC分类号: H03M3/00

    CPC分类号: H03M3/432

    摘要: A system for a continuous time noise shaping analog-to-digital converter (“ADC”) with a suppressed carrier pulse width modulated (“PWM”) quantizer is disclosed. In particular, a suppressed carrier feedback signal may expand the dynamic range of a sigma delta modulated ADC and enhance the stability of the noise shaping loop.

    摘要翻译: 公开了一种具有抑制载波脉宽调制(“PWM”)量化器的连续时间噪声整形模数转换器(“ADC”)的系统。 特别地,抑制的载波反馈信号可以扩展Σ-Δ调制ADC的动态范围,并增强噪声整形环路的稳定性。

    Apparatus for noise shaping a pulse width modulation (PWM) signal and method therefor
    6.
    发明授权
    Apparatus for noise shaping a pulse width modulation (PWM) signal and method therefor 有权
    用于对脉宽调制(PWM)信号进行噪声整形的装置及其方法

    公开(公告)号:US06414613B1

    公开(公告)日:2002-07-02

    申请号:US09478013

    申请日:2000-01-05

    IPC分类号: H03M300

    摘要: A method for preserving phase information during quantization of pulse width modulation (PWM) signals used in power system applications. In one embodiment, a digital audio amplifier (12) implements a method of noise shaping, where the quantization error is used in coordination with a noise shaping filter (64) to remove the noise from the desired baseband of the output. A phase-preserving expression is used to provide additional information for generating the amplified output (40). In one embodiment, the filter (64) includes a series of integrators (70, 72), where non-linear integration terms are added at each stage of integration to provide the phase information. In one embodiment the filter is implemented in software to run on a digital signal processor, and in another the filter is implemented in a hardware accelerator.

    摘要翻译: 一种用于在电力系统应用中使用的脉冲宽度调制(PWM)信号的量化期间保持相位信息的方法。 在一个实施例中,数字音频放大器(12)实现噪声整形的方法,其中与噪声整形滤波器(64)协调使用量化误差以从输出的期望基带去除噪声。 相位保留表达式用于提供用于生成放大输出的附加信息(40)。 在一个实施例中,滤波器(64)包括一系列积分器(70,72),其中在每个集成阶段添加非线性积分项以提供相位信息。 在一个实施例中,滤波器以软件实现以在数字信号处理器上运行,而另一个滤波器在硬件加速器中实现。

    Using Virtual Table Protections to Prevent the Exploitation of Object Corruption Vulnerabilities
    7.
    发明申请
    Using Virtual Table Protections to Prevent the Exploitation of Object Corruption Vulnerabilities 有权
    使用虚拟表格保护来防止对象损坏漏洞利用

    公开(公告)号:US20120144480A1

    公开(公告)日:2012-06-07

    申请号:US12958668

    申请日:2010-12-02

    IPC分类号: G06F21/00

    CPC分类号: G06F21/6218 G06F2221/2143

    摘要: The subject disclosure is directed towards preventing the exploitation by malicious code of object state corruption vulnerabilities, such as use-after-free vulnerabilities. An object class is configured with a secret cookie in a virtual function table of the object, e.g., inserted at compile time. An instrumentation check inserted in the program code evaluates the secret cookie to determine whether the object state has been corrupted before object access (e.g., a call to one of the object's methods) is allowed. If corrupted, access to the object is prevented by the instrumentation check. Another instrumentation check may be used to determine whether the object's virtual table pointer points to a location outside of the module that contains the legitimate virtual function table; if so, object access is prevented.

    摘要翻译: 该主题披露旨在防止恶意代码利用对象状态破坏漏洞(例如使用后免费漏洞)。 对象类在对象的虚拟功能表中配置有秘密cookie,例如在编译时插入。 插入程序代码中的检测检查将评估秘密cookie,以确定对象状态是否在对象访问之前已被破坏(例如,对对象的方法之一的调用)。 如果损坏,仪器检查会阻止对对象的访问。 可以使用另一种仪器检查来确定对象的虚拟表指针是否指向包含合法虚拟功能表的模块之外的位置; 如果是这样,则可以防止对象访问。

    Method and system for determining an element conversion characteristic contemporaneous with converting and input signal in a signal converter
    8.
    发明授权
    Method and system for determining an element conversion characteristic contemporaneous with converting and input signal in a signal converter 有权
    用于确定与信号转换器中的转换和输入信号同时的元件转换特性的方法和系统

    公开(公告)号:US06411232B1

    公开(公告)日:2002-06-25

    申请号:US09409779

    申请日:1999-09-30

    IPC分类号: H03M110

    CPC分类号: H03M3/386 H03M3/388 H03M3/424

    摘要: A converter continuously converts an input signal (110) to an output signal (112) even during correction and compensation. A primary converter (124) converts the signal along a forward primary path (104). A feedback converter (140) along a feedback path (106) outputs a feedback signal (116). A reference device (136) employs reference indicator (134) to provide a digital reference signal (135). A selection device (132) passes the digital reference signal (135) to an element (204) of the feedback converter (140) for outputting reference portion (208) of the feedback signal (116). The passing of the digital reference signal (135) to the element (204) is contemporaneous with the converting of the input signal (110) to the output signal (112). The evaluator (142) determines a conversion characteristic of the element (204) by employing a characteristic of the reference indicator (134).

    摘要翻译: 即使在校正和补偿期间,A转换器也将输入信号(110)连续地转换为输出信号(112)。 主转换器(124)沿着前向主路径(104)转换信号。 沿反馈路径(106)的反馈转换器(140)输出反馈信号(116)。 参考装置(136)使用参考指示器(134)来提供数字参考信号(135)。 选择装置(132)将数字参考信号(135)传递到反馈转换器(140)的元件(204),用于输出反馈信号(116)的参考部分(208)。 将数字参考信号(135)传递到元件(204)同时与输入信号(110)转换为输出信号(112)。 评估器(142)通过采用参考指示符(134)的特性来确定元件(204)的转换特性。

    Using virtual table protections to prevent the exploitation of object corruption vulnerabilities
    9.
    发明授权
    Using virtual table protections to prevent the exploitation of object corruption vulnerabilities 有权
    使用虚拟表保护来防止利用对象损坏的漏洞

    公开(公告)号:US08683583B2

    公开(公告)日:2014-03-25

    申请号:US12958668

    申请日:2010-12-02

    IPC分类号: G06F21/00

    CPC分类号: G06F21/6218 G06F2221/2143

    摘要: The subject disclosure is directed towards preventing the exploitation by malicious code of object state corruption vulnerabilities, such as use-after-free vulnerabilities. An object class is configured with a secret cookie in a virtual function table of the object, e.g., inserted at compile time. An instrumentation check inserted in the program code evaluates the secret cookie to determine whether the object state has been corrupted before object access (e.g., a call to one of the object's methods) is allowed. If corrupted, access to the object is prevented by the instrumentation check. Another instrumentation check may be used to determine whether the object's virtual table pointer points to a location outside of the module that contains the legitimate virtual function table; if so, object access is prevented.

    摘要翻译: 该主题披露旨在防止恶意代码利用对象状态破坏漏洞(例如使用后免费漏洞)。 对象类在对象的虚拟功能表中配置有秘密cookie,例如在编译时插入。 插入程序代码中的检测检查将评估秘密cookie,以确定对象状态是否在对象访问之前已被破坏(例如,对对象的方法之一的调用)。 如果损坏,仪器检查会阻止对对象的访问。 可以使用另一种仪器检查来确定对象的虚拟表指针是否指向包含合法虚拟功能表的模块之外的位置; 如果是这样,则可以防止对象访问。