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    • 42. 发明授权
    • Stream-cleaned differential reflection coefficient sensor
    • 流清洁的差分反射系数传感器
    • US06330831B1
    • 2001-12-18
    • US09420453
    • 1999-10-18
    • Lawrence C. LynnworthYi Liu
    • Lawrence C. LynnworthYi Liu
    • G01F166
    • G01F1/662G01F1/665G01F1/86G01H15/00G01N9/002G01N29/032G01N2291/02818G01N2291/02836G01N2291/02881
    • An ultrasonic system employs a path through a fluid to determine fluid density by a differential reflection coefficient measurement of fluid impedance Z and a fluid sound speed c. Preferred configurations use clamp-on (external) transducers and combine ultrasonic measurements of flow velocity V over one or more paths, to obtain the mass flow rate. Z is determined by comparing reflections from a reference target, which may be totally reflective, with reflections from a sensor target having an effectively lower Z, which may be close to that of the fluid. Both targets are preferably located to be cleaned by the natural flow of the fluid. The low-Z target is interrogated at least once. Vee blocks provide a compact combination of reference and sensor targets that can be integrated with a velocity-sensing flowcell. Folded-path flow cells compactly measure V alone or in combination with density. The principal surface may be aligned parallel to the free stream direction and located to yield a flow value substantially equal to the area averaged flow, and the system may further correct for variations in the vicinity of the reflector.
    • 超声波系统采用通过流体的路径,通过流体阻抗Z的差分反射系数测量值和流体声速c来确定流体密度。 优选的配置使用夹紧(外部)换能器并且结合一个或多个路径的流速V的超声波测量以获得质量流率。 Z通过将来自可能是完全反射的参考目标的反射与具有有效低的Z的传感器目标的反射进行比较来确定,该传感器目标可以接近于流体。 两个目标优选地定位成通过流体的自然流动来清洁。 低Z目标讯问至少一次。 Vee块提供可与速度感测流通池集成的参考和传感器目标的紧凑组合。 折叠路径流动细胞紧密地测量V单独或结合密度。 主表面可以平行于自由流方向对准并且被定位成产生基本上等于面积平均流量的流量值,并且系统可以进一步校正反射器附近的变化。
    • 43. 发明授权
    • Fast multiplication of floating point values and integer powers of two
    • 浮点数和二进制的整数幂的快速乘法
    • US06233595B1
    • 2001-05-15
    • US09075074
    • 1998-05-08
    • Lei ChengFrank J. Gorishek, IVYi Liu
    • Lei ChengFrank J. Gorishek, IVYi Liu
    • G06F9302
    • G06F7/4876G06F9/30014
    • A method for performing fast multiplication in a microprocessor is disclosed. The method comprises detecting multiplication operations that have a floating point operand and an integer operand, wherein the integer operand is an integer power of two. Once detected, a multiplication operation meeting these criteria may be executed by using an integer adder to sum the integer power and the floating point operand's exponent to from a product exponent. The bias of the integer operand's exponent may also be subtracted. A product mantissa is simply copied from the floating point operand's mantissa. The floating point operand's sign bit may be inverted to form the product's sign bit if the integer operand is negative. Advantageously, the product is generated using integer addition which is faster than floating point multiplication. The method may be implemented in hardware or software.
    • 公开了一种在微处理器中执行快速乘法的方法。 该方法包括检测具有浮点操作数和整数操作数的乘法运算,其中整数操作数是2的整数幂。 一旦被检测到,可以通过使用整数加法器来执行满足这些标准的乘法运算,以从乘积指数将整数幂和浮点运算数的指数相加。 也可以减去整数操作数的指数的偏差。 产品尾数简单地从浮点运算符的尾数复制出来。 如果整数操作数为负,则浮点运算符的符号位可能会反转,以形成乘积符号位。 有利地,使用比浮点乘法更快的整数加法来产生乘积。 该方法可以在硬件或软件中实现。
    • 45. 发明授权
    • Method and apparatus for improved video decompression using previous
frame DCT coefficients
    • 用于使用先前帧DCT系数改进视频解压缩的方法和装置
    • US5809173A
    • 1998-09-15
    • US424739
    • 1995-04-18
    • Yi LiuMichael R. TuckerGeoffrey S. Strongin
    • Yi LiuMichael R. TuckerGeoffrey S. Strongin
    • G06T9/00H04N7/30H04N7/46G06K9/36G06K9/46H04N7/12
    • H04N19/577H04N19/60
    • An video decoder system, such as for use with MPEG video compression, uses a previous B-frame as an additional prediction source for the current B-frame. In one embodiment, a given block within a current B-frame "N" reuses IDCT result terms from the previous B-frame "N-1" if they are determined to be "similar enough" to the anticipated IDCT result terms which would otherwise need to be computed. For a given block, each of the "M" lowest-frequency DCT coefficients for B-frame "N" and B-frame "N-1" are respectively compared: if they differ by less than a similarity threshold value, then the IDCT result terms from the previous B-frame "N-1" are reused without further computation. The similarity threshold may be adaptively adjusted to reduce the computational burden of video decompression, while affording a gradual degradation of picture quality, rather than wholesale skipping of entire frames.
    • 诸如用于MPEG视频压缩的视频解码器系统使用先前的B帧作为当前B帧的附加预测源。 在一个实施例中,当前的B帧“N”中的给定块重新使用来自先前B帧“N-1”的IDCT结果项,如果它们被确定为与预期的IDCT结果项“足够相似” 需要计算。 对于给定的块,分别比较用于B帧“N”和B帧“N-1”的“M”个最低频率DCT系数中的每一个,如果它们相差小于相似性阈值,则IDCT 来自前一个B帧“N-1”的结果项被重新使用,无需进一步的计算。 可以自适应地调整相似性阈值,以减少视频解压缩的计算负担,同时提供图像质量的逐渐劣化,而不是批量跳过整个帧。