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    3D wavelet based video codec with human perceptual model
    64.
    发明授权
    3D wavelet based video codec with human perceptual model 有权
    基于3D小波的视频编解码器与人类感知模型

    公开(公告)号：US07006568B1

    公开(公告)日：2006-02-28

    申请号：US09979930

    申请日：2000-05-26

    Applicant: Junfeng Gu ,  Yimin Jiang ,  John S. Baras

    Inventor： Junfeng Gu ,  Yimin Jiang ,  John S. Baras

    IPC: H04B1/66

    CPC classification number: H04N19/67 ,  H04N19/126 ,  H04N19/13 ,  H04N19/137 ,  H04N19/142 ,  H04N19/154 ,  H04N19/46 ,  H04N19/62 ,  H04N19/89 ,  H04N19/895

    Abstract: A video encoding/decoding system based on 3D wavelet decomposition and the human perceptual model is implemented. JND is applied in quantizer design to improve the subjective quality of compressed video. The 3D wavelet decomposition helps to remove spatial and temporal redundancy and provides scalability of video quality. In order to conceal the errors that may, occur under bad wireless channel conditions, a slicing method and a joint source channel coding scenario, that combines RCPC with CRC and utilizes the distortion information to allocate convolutional coding rates are proposed. A new subjective quality index based on JND is presented and used to evaluate the overall system performance at different signal to noise rations (SNR) and at different compression ratios. Due to the wide use of arithmetic coding (AC) in data compression, it is considered as a readily available unit in the video codec system for broadcasting. A new scheme for conditional access (CA) sub-system is designed based on the compression graphic property of arithmetic coding. Its performance is analyzed along with its application in a multi-resolution video compression system. This scheme simplifies the conditional access sub-system and provides satisfactory system reliability.

    Abstract translation: 实现了基于3D小波分解和人类感知模型的视频编码/解码系统。 JND应用于量化器设计，以提高压缩视频的主观质量。 3D小波分解有助于消除空间和时间冗余并提供视频质量的可扩展性。 为了掩盖在不良无线信道条件下发生的错误，提出了将RCPC与CRC组合并利用失真信息来分配卷积编码率的分片方法和联合源信道编码场景。 提出了一种基于JND的新的主观质量指标，用于评估不同信噪比（SNR）和不同压缩比下的整体系统性能。 由于在数据压缩中广泛使用算术编码（AC），被认为是用于广播的视频编解码系统中的容易获得的单元。 基于算术编码的压缩图形属性设计了条件访问（CA）子系统的新方案。 分析其性能以及其在多分辨率视频压缩系统中的应用。 该方案简化了条件访问子系统，提供了令人满意的系统可靠性。

    Energy recovery snubber circuit for bidirectional power converter and method of operation thereof
    66.
    发明授权
    Energy recovery snubber circuit for bidirectional power converter and method of operation thereof 失效
    双向功率转换器的能量恢复缓冲电路及其操作方法

    公开(公告)号：US06501194B1

    公开(公告)日：2002-12-31

    申请号：US09652887

    申请日：2000-08-31

    Applicant: Yimin Jiang ,  Hengchun Mao

    Inventor： Yimin Jiang ,  Hengchun Mao

    IPC: H02J700

    CPC classification number: H02J9/062 ,  H02M3/33584 ,  H02M2001/009 ,  Y10T307/625 ,  Y10T307/696

    Abstract: An energy recovery snubber circuit for a bidirectional power converter, a method of operation thereof and a power plant employing the bidirectional power converter. The bidirectional power converter has first and second inputs, an inductor coupled to the first input and a power switch coupled between the inductor and the second input. In one embodiment, the energy recovery snubber circuit includes: (1) a clamping capacitor coupled to the second input; (2) a clamping diode coupled between the clamping capacitor and the first input; and (3) a snubber inductor coupled to a node between the clamping capacitor and the clamping diode.

    Abstract translation: 一种用于双向功率转换器的能量恢复缓冲电路，其操作方法和采用双向功率转换器的电厂。 双向功率转换器具有第一和第二输入，耦合到第一输入的电感器和耦合在电感器和第二输入端之间的功率开关。 在一个实施例中，能量恢复缓冲电路包括：（1）耦合到第二输入的钳位电容器; （2）耦合在钳位电容器和第一输入端之间的钳位二极管; 和（3）耦合到钳位电容器和钳位二极管之间的节点的缓冲电感器。

    Method and circuit for reducing voltage level variation in a bias voltage in a power converter
    67.
    发明授权
    Method and circuit for reducing voltage level variation in a bias voltage in a power converter 有权
    用于降低功率转换器中的偏置电压中的电压电平变化的方法和电路

    公开(公告)号：US06466461B2

    公开(公告)日：2002-10-15

    申请号：US10068252

    申请日：2002-02-07

    Applicant: Hengchun Mao ,  Yimin Jiang

    Inventor： Hengchun Mao ,  Yimin Jiang

    IPC: H02M3335

    CPC classification number: H02M3/33569

    Abstract: Circuit and method for reducing voltage level variation in a bias voltage generated in a power converter device are provided. The method allows providing a first voltage source configured to supply a first voltage during one respective mode of operation of the power converter, wherein the level of the voltage supplied by the first voltage source is directly proportional to variation in an input voltage of the converter device. The method further allows providing a second voltage source configured to supply a second voltage during another respective mode of operation of the power converter, wherein the level of the voltage supplied by the second voltage source has a generally inverse proportional relationship relative to variation in the input voltage of the converter device. At least one circuit parameter is selected in the voltage sources to adjust the respective levels of the first and second voltages. The first and second voltages are combined with one another to generate a combined voltage that comprises the bias voltage in the power converter device, the combined voltage resulting in a bias voltage level being relatively impervious to variation in the input voltage of the converter device.

    Abstract translation: 提供了用于降低在功率转换器装置中产生的偏置电压中的电压电平变化的电路和方法。 该方法允许提供被配置为在功率转换器的一个相应操作模式期间提供第一电压的第一电压源，其中由第一电压源提供的电压的电平与转换器装置的输入电压的变化成正比 。 该方法还允许提供被配置为在功率转换器的另一相应操作模式期间提供第二电压的第二电压源，其中由第二电压源提供的电压的电平相对于输入的变化具有大体上的反比例关系 转换器装置的电压。 在电压源中选择至少一个电路参数以调整第一和第二电压的相应电平。 第一和第二电压彼此组合以产生包括功率转换器装置中的偏置电压的组合电压，导致偏置电压电平相对不受转换器装置的输入电压变化的组合电压。

    Asymmetrical DC/DC converter having output current doubler
    68.
    发明授权
    Asymmetrical DC/DC converter having output current doubler 有权
    具有输出电流倍增器的非对称DC / DC转换器

    公开(公告)号：US6163466A

    公开(公告)日：2000-12-19

    申请号：US397991

    申请日：1999-09-16

    Applicant: Marco A. Davila, Jr. ,  Yimin Jiang ,  Rui Liu

    Inventor： Marco A. Davila, Jr. ,  Yimin Jiang ,  Rui Liu

    IPC: H02M3/337 ,  H02M7/08 ,  H02M3/335

    CPC classification number: H02M7/08 ,  H02M3/337

    Abstract: A circuit for, and method of, reducing a preload current required to maintain a duty cycle of an asymmetrical DC/DC converter and a DC/DC converter incorporating the circuit or the method. In one embodiment, the circuit includes an auxiliary inductor, coupled in series with an output capacitor of the converter in an output current doubler thereof, that reduces ripple current in the output current doubler and thereby maintains the duty cycle.

    Abstract translation: 降低保持不对称DC / DC转换器的占空比所需的预负载电流的电路及其方法，以及包含电路或方法的DC / DC转换器。 在一个实施例中，电路包括辅助电感器，其在输出电流倍增器中与转换器的输出电容器串联耦合，从而减小输出电流倍增器中的纹波电流，从而维持占空比。

    Dual mode boost converter and method of operation thereof
    69.
    发明授权
    Dual mode boost converter and method of operation thereof 失效
    双模升压转换器及其操作方法

    公开(公告)号：US5831846A

    公开(公告)日：1998-11-03

    申请号：US916319

    申请日：1997-08-22

    Applicant: Yimin Jiang

    Inventor： Yimin Jiang

    IPC: H02M1/00 ,  H02M1/42 ,  H02M7/00

    CPC classification number: H02M1/4208 ,  Y02B70/126

    Abstract: A boost converter, a method of operating the same and a power converter employing the boost converter or the method. In one embodiment, the boost converter includes: (1) a rectifier bridge having first and second input nodes and first and second output nodes, the second input node couplable to a source of AC power, (2) an inductor coupled to the first input node and couplable to the source of AC power, (3) first and second switches, coupled to first and second capacitors of the boost converter and the first and second input nodes, respectively, that are controllable to apply AC power from the source of AC power to the inductor and (4) a contactor, coupled between an intermediate node in the rectifier bridge and the node between the first and second capacitors, that is controllable to achieve alternative open and closed states in which: (4a) in the open state, the first and second switches are coupled in series across the source of AC power and (4b) in the closed state, the first switch is coupled across the source of AC power to reduce an overall loss associated with the first and second switches.

    Abstract translation: 升压转换器，其操作方法和采用升压转换器的功率转换器或方法。 在一个实施例中，升压转换器包括：（1）具有第一和第二输入节点以及第一和第二输出节点的整流桥，所述第二输入节点可耦合到AC电源，（2）耦合到所述第一输入端的电感器 节点并且可耦合到AC电源，（3）第一和第二开关，分别耦合到升压转换器的第一和第二电容器以及第一和第二输入节点，其可控制以从AC源施加AC电力 耦合到电感器的功率和（4）耦合在整流器桥中的中间节点与第一和第二电容器之间的节点之间的接触器，其可控制以实现替代的打开和关闭状态，其中：（4a）处于打开状态 第一和第二开关串联连接在交流电源和（4b）处于闭合状态时，第一开关耦合在交流电源上，以减少与第一和第二开关相关联的整体损耗。

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