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1. 发明授权

US4384592A Low-noise valve trim 失效
标题翻译：低噪音阀门装饰
公开(公告)号：US4384592A
公开(公告)日：1983-05-24
申请号：US212666
申请日：1980-11-28
申请人： Kam W. Ng
发明人： Kam W. Ng
IPC分类号： F16K3/34 , F16K47/08 , F16K47/14
CPC分类号： F16K47/08 , F16K3/34 , Y10T137/86734 , Y10T137/86791
摘要： A cylindrical valve trim has holes in the valve trim wall that provide a fluid flow path through the valve. The holes pass through the wall at predetermined angles to create a plurality of counter-rotating vortices with parallel axes normal to the wall.
摘要翻译：圆柱形阀门装饰件在阀门装饰壁中具有孔，其提供穿过该阀的流体流动路径。孔以预定角度穿过壁以产生具有垂直于壁的平行轴线的多个反向旋转涡流。

2. 依法登记的发明

USH1317H Ring damper for structureborne noise suppression in piping systems 失效
标题翻译：用于管道系统中结构噪声抑制的环形阻尼器
公开(公告)号：USH1317H
公开(公告)日：1994-06-07
申请号：US592035
申请日：1990-10-03
申请人： Kam W. Ng
发明人： Kam W. Ng
IPC分类号： F16L55/033 , F16L11/00 , G10K11/00
CPC分类号： F16L55/0335
摘要： A ring damper for reducing vibration and structureborne noise propagation piping systems, comprising a metal ring that is clamped circumferentially around the outer surface of the pipe or duct, said ring defining an annular chamber or cavity that is stuffed with a combination of damping materials.

3. 外观设计

USD309437S Combined clock and flashlight 失效
公开(公告)号：USD309437S
公开(公告)日：1990-07-24
申请号：US905948
申请日：1986-09-09
申请人： Kam W. Ng
设计人： Kam W. Ng

4. 发明授权

US4982375A Acoustic intensity probe 失效
标题翻译：声强探头
公开(公告)号：US4982375A
公开(公告)日：1991-01-01
申请号：US436509
申请日：1989-11-13
申请人： Kam W. Ng
发明人： Kam W. Ng
IPC分类号： G01H3/12 , G01S3/80
CPC分类号： G01S3/80 , G01H3/12
摘要： An acoustic intensity probe was developed to measure waterborne sound intity levels using a two-hydrophone technique. The technique utilizes the cross-spectral density of signals from multiple closely spaced hydrophones. Planar (2-dimensional) and 3-dimensional arrays of hydrophones with symmetric and asymmetric configurations were developed to measure the acoustic intensity levels. This acoustic intensity probe combined with the two-hydrophone technique provides spcific information revelaing the acoustic energy distribution and propagation of noise sources in any acoustic environment.
摘要翻译：开发了一种声强度探头，用双水听器技术测量水声强度水平。该技术利用来自多个紧密间隔的水听器的信号的交叉谱密度。开发了具有对称和非对称构型的平面（2维）和3维水听器阵列以测量声强度水平。这种声强度探头与双水听器技术相结合，提供了在任何声学环境中声音能量分布和噪声源传播的特征信息。

5. 外观设计

USD300826S Telephone set 失效
公开(公告)号：USD300826S
公开(公告)日：1989-04-25
申请号：US129138
申请日：1987-12-04
申请人： Kam W. Ng
设计人： Kam W. Ng

6. 依法登记的发明

USH1357H Active sound cancellation system for time-varying signals 失效
标题翻译：用于时变信号的主动声音消除系统
公开(公告)号：USH1357H
公开(公告)日：1994-09-06
申请号：US573415
申请日：1990-08-27
申请人： Kam W. Ng , Henry A. Leinhos
发明人： Kam W. Ng , Henry A. Leinhos
IPC分类号： G10K11/178 , G10K11/16 , H04R1/28
CPC分类号： G10K11/178 , G10K2210/127 , G10K2210/3012 , G10K2210/3035 , G10K2210/3041 , G10K2210/3045
摘要： In a fluidborne or structureborne sound system, a method and apparatus arerovided for actively canceling transient acoustic noise. A high-speed controller utilizes a weighted combination of open and closed-loop inputs to provide a correction signal to a cancellation source. The cancellation source introduces a canceling acoustic wave that is equal in amplitude but 180.degree. out of phase with respect to the acoustic noise in order to cancel the acoustic noise within the system. The open-loop input is provided by a database containing a predicted, off-line model of the acoustic noise. The closed-loop input is provided by a combination of 1) an input signal generated by the input acoustic wave and feedback from the cancellation source as measured by an input sensor and 2) an error signal generated at the output of the system as measured by an error sensor. The weighted combination of the open and closed-loop inputs is chosen to minimize the error signal.

7. 发明授权

US5150414A Method and apparatus for signal prediction in a time-varying signal system 失效
标题翻译：时变信号系统中信号预测的方法和装置
公开(公告)号：US5150414A
公开(公告)日：1992-09-22
申请号：US678580
申请日：1991-03-27
申请人： Kam W. Ng
发明人： Kam W. Ng
IPC分类号： G10K11/178
CPC分类号： G10K11/1782 , G10K2210/3011 , G10K2210/3012 , G10K2210/3035 , G10K2210/3041
摘要： A method and apparatus for signal prediction using the estimate-maximize ) algorithm in a time-varying signal system is provided. A time function is used to appropriately weight, in complementary fashion, the significance of both the complete and incomplete data sets used by the EM algorithm over a time period of interest. Initially, the EM solution is based solely on the complete data set. As time progresses, the significance of the complete data set in the solution decreases while the significance of the incomplete data set increases. By the end of the time period of interest, the EM solution is based solely on the incomplete data set. The rate of decrease of significance of the complete data set, and complementary increase in significance of the incomplete data set, are controlled by the characteristics of the time function. The method is particularly useful in the area of active noise control where an open-loop response is provided by off-line predictive models of the time-varying noise signals to form the complete data set and where a closed-loop adaptive response forms the incomplete data set.
摘要翻译：提供了一种使用时变信号系统中的估计最大化（EM）算法进行信号预测的方法和装置。时间函数用于以互补的方式适当地加权EM算法在感兴趣的时间段内使用的完整数据集和不完整数据集的重要性。最初，EM解决方案完全基于完整的数据集。随着时间的推移，解决方案中完整数据集的意义减少，而不完整数据集的意义增加。在感兴趣的时间段结束时，EM解决方案完全基于不完整的数据集。完整数据集的显着性降低率和不完整数据集的显着性的互补增长，由时间函数的特征来控制。该方法在有源噪声控制领域特别有用，其中通过时变噪声信号的离线预测模型提供开环响应以形成完整数据集，并且闭环自适应响应形成不完整的数据集。

8. 发明授权

US5074324A Method and apparatus for reducing drag and noise associated with fluid flow in a conduit 失效
标题翻译：用于减少与管道中的流体流动相关联的阻力和噪声的方法和装置
公开(公告)号：US5074324A
公开(公告)日：1991-12-24
申请号：US729743
申请日：1991-07-12
申请人： Kam W. Ng
发明人： Kam W. Ng
IPC分类号： F15D1/06 , F17D1/20
CPC分类号： F15D1/065 , F17D1/20 , Y10T137/0391 , Y10T137/206
摘要： A method and apparatus for reducing drag and noise associated with fluid w within a conduit is provided. The conduit has flexible walls that are shaped to form stationary waves having peaks and troughs and are repeated in the axial direction of the conduit. The stationary waves are moved along the axial direction of the conduit whereby a vortex is trapped in the fluid flow at each of the troughs. Each of the vortices forms part of an isolating layer between the conduit wall and the main stream of the fluid flow thereby reducing drag. Furthermore, the vortices push the dominant noise producing region toward the center of the fluid flow where sound coupling efficiency is lower.
摘要翻译：提供了用于减少与管道内的流体流动相关联的阻力和噪声的方法和装置。导管具有柔性壁，其被成形为形成具有峰谷的静止波并且沿导管的轴向方向重复。固定波沿导管的轴向移动，由此涡流被捕获在每个槽的流体流中。每个涡流形成导管壁和流体流的主流之间的隔离层的一部分，从而减少阻力。此外，涡流将主要噪声产生区域推向声耦合效率较低的流体流中心。

9. 外观设计

USD313756S Piano clock 失效
公开(公告)号：USD313756S
公开(公告)日：1991-01-15
申请号：US145497
申请日：1988-01-19
申请人： Kam W. Ng
设计人： Kam W. Ng

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