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42 条记录 (耗时 0.026 秒)

    Wavelet-based interference filtering for spread-spectrum signal
    11.
    发明授权
    Wavelet-based interference filtering for spread-spectrum signal 失效
    用于扩频信号的基于小波的干扰滤波

    公开(公告)号：US06219373B1

    公开(公告)日：2001-04-17

    申请号：US09106504

    申请日：1998-06-15

    申请人： David A. Lee ,  Grant A. Hansen ,  Wei Kuo

    发明人： David A. Lee ,  Grant A. Hansen ,  Wei Kuo

    IPC分类号： A61F206

    CPC分类号： G06F17/148 ,  G01S19/21 ,  H04K3/228

    摘要： Interference from a spread-spectrum signal (e.g., GPS) is filtered out utilizing a wavelet-based method. A wavelet packet decomposition scheme generates a first plurality of coefficient sets from the signal(s). An entropy measurement is determined for each resulting wavelet decomposition level. Portions of the spread-spectrum signal occurring above the noise floor for the wavelet decomposition level having the lowest entropy measurement are then filtered out so that a revised coefficient set is generated therefor. As a result, a second plurality of coefficient sets can be formed such that the first plurality of coefficient sets differs from the second plurality of coefficient sets only by the revised coefficient set. A new signal is formed by applying a wavelet packet reconstruction scheme to the second plurality of coefficient sets.

    摘要翻译： 使用基于小波的方法来滤波来自扩频信号（例如，GPS）的干扰。 小波包分解方案从信号生成第一多个系数集合。 对于每个产生的小波分解级别确定熵测量。 对于具有最低熵测量的小波分解水平，出现在噪声本底之上的扩频信号的部分然后被滤除，从而为此生成修正的系数集。 结果，可以形成第二多个系数集合，使得第一多个系数集合仅与第二多个系数集合仅通过修改的系数集合而不同。 通过对第二多个系数组应用小波包重建方案来形成新的信号。

    Snubber with integral test structure
    12.
    发明授权
    Snubber with integral test structure 失效
    缓冲器具有整体测试结构

    公开(公告)号：US4730706A

    公开(公告)日：1988-03-15

    申请号：US883700

    申请日：1986-07-09

    申请人： Douglas P. Taylor ,  David A. Lee

    发明人： Douglas P. Taylor ,  David A. Lee

    IPC分类号： F16F9/20 ,  F16F9/32 ,  F16F9/24

    CPC分类号： F16F9/20 ,  F16F9/3264

    摘要： A snubber with an integral test structure which permits the snubber to be tested for drag, lockup and full load pressure characteristics without disconnecting it from between two external members between which it is mounted including a cylinder with opposite end walls, a piston mounted on a piston rod extending through the end walls and dividing the space between the end walls into first and second chambers which are filled with hydraulic fluid, a first clevis connecting one end of the piston rod to a first external member, a housing mounted for sliding movement on the cylinder and including a second clevis connecting it to a second external member, a plurality of selectively removable pins for fixedly attaching the housing to the cylinder or permitting it, when removed, to slide relative thereto, and ports in communication with the two chambers for conducting hydraulic liquid thereto or exhausting hydraulic liquid therefrom.

    摘要翻译： 具有整体测试结构的缓冲器，其允许缓冲器被测试阻力，锁定和满载压力特性，而不将其从其安装的两个外部构件之间断开，包括具有相对端壁的气缸，安装在活塞上的活塞 杆延伸穿过端壁并且将端壁之间的空间分成充满液压流体的第一和第二腔室，将活塞杆的一端连接到第一外部构件的第一U形夹，安装成在其上滑动的壳体 并且包括将其连接到第二外部构件的第二U形夹，多个可选择性地拆卸的销，用于将壳体固定地附接到气缸或允许其移除时相对于其滑动，并且与两个室连通的端口用于导电 液压液体或排出液压液体。

    Electronote wall mounted messaging device
    17.
    发明授权
    Electronote wall mounted messaging device 失效
    电子挂墙式消音装置

    公开(公告)号：US06438221B1

    公开(公告)日：2002-08-20

    申请号：US09391162

    申请日：1999-09-08

    申请人： David A. Lee ,  Joseph E. Buczek

    发明人： David A. Lee ,  Joseph E. Buczek

    IPC分类号： H04M164

    CPC分类号： H04M1/0291 ,  G08B3/10 ,  H04M1/6505

    摘要： A wall-hung or shelf situated free-standing voice memorandum system allows an individual to record a message for another member of the household. the system can be used in connection with a household doorbell system so that at the user's choice, the system either operates simply as a doorbell or when the door button is pressed plays at the door a greeting that the user has recorded, invites the visitor to leave voice messages for the household-and-records any messages given.

    摘要翻译： 一个挂墙或搁置的独立的声音备忘录系统允许个人为另一个家庭成员录制信息。 该系统可以与家用门铃系统结合使用，以便在用户的选择时，该系统或者简单地作为门铃操作，或者当按下门按钮在门上播放用户记录的问候时，邀请访问者 留下家里的语音信息和记录任何给定的信息。

    Self-centering column assembly employing liquid spring and structures containing such columns
    19.
    发明授权
    Self-centering column assembly employing liquid spring and structures containing such columns 失效
    采用液体弹簧的自定心柱组件和包含这种柱的结构

    公开(公告)号：US6042094A

    公开(公告)日：2000-03-28

    申请号：US887433

    申请日：1997-07-02

    申请人： David A. Lee

    发明人： David A. Lee

    IPC分类号： E04H9/02 ,  F16F9/54 ,  F16F15/00 ,  F16F15/02 ,  F16F1/00

    CPC分类号： E04H9/021 ,  F16F15/02 ,  F16F9/54 ,  E04H2009/026 ,  F16F2230/14 ,  F16F2230/38

    摘要： A self-centering spring assembly which is a column located between first and second vertically spaced frame members including a first end on the column movably secured to the first frame member, a second end on the column secured to the second frame member, a member having a first end movably mounted on the column and a second end in movable engagement with the first frame member, and a liquid spring connected between the second end of the movable member and the column.

    摘要翻译： 自定心弹簧组件，其是位于第一和第二垂直间隔开的框架构件之间的柱，其包括可移动地固定到第一框架构件的柱上的第一端，固定到第二框架构件的柱上的第二端，具有 可移动地安装在柱上的第一端和与第一框架构件可移动接合的第二端和连接在可动构件的第二端和柱之间的液体弹簧。