专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

51. 发明授权

US5841467A Ground isolation circuit for isolating a transmission line from ground interference 失效
标题翻译：用于隔离输电线路与地面干扰的接地隔离电路
公开(公告)号：US5841467A
公开(公告)日：1998-11-24
申请号：US595312
申请日：1996-02-01
申请人： Craig A. Davidson
发明人： Craig A. Davidson
IPC分类号： H04B3/28 , H04N7/10 , H04B1/26
CPC分类号： H04B3/28 , H04N7/102
摘要： An isolation circuit is disclosed for isolating ground interference from a wideband transmission signal. The ground isolation circuit of the present invention is constructed using a pair of matched mixer circuits, each of which receives a carrier signal from the same oscillator circuit. The first mixer circuit also receives the baseband signal input after appropriate conditioning, and modulates the baseband signal onto the carrier signal. In the preferred embodiment, the carrier signal has a predetermined frequency which is at least two times the frequency of the baseband signal. The modulated signal (which preferably comprises an rf signal) is transmitted via an rf transmission line to the second mixer, which demodulates the rf signal to recover the baseband signal. Each port of the mixer circuits connects to an isolation transformer to insure isolation from ground interference.
摘要翻译：公开了用于将接地干扰与宽带传输信号隔离的隔离电路。本发明的接地隔离电路使用一对匹配的混频器电路构成，每个混频器电路从相同的振荡器电路接收载波信号。第一混频器电路在适当调节之后也接收基带信号输入，并将基带信号调制到载波信号上。在优选实施例中，载波信号具有至少是基带信号频率的两倍的预定频率。调制信号（其优选地包括rf信号）经由rf传输线传输到第二混频器，其解调rf信号以恢复基带信号。混频器电路的每个端口连接到隔离变压器，以确保与地面干扰的隔离。

52. 发明授权

US5737461A Methods and filter for isolating upstream ingress noise in a bi-directional cable system 失效
公开(公告)号：US5737461A
公开(公告)日：1998-04-07
申请号：US644029
申请日：1996-05-09
申请人： Stuart Baker Sanders , Vivian Therese Lund
发明人： Stuart Baker Sanders , Vivian Therese Lund
IPC分类号： H03H7/065 , H03H11/24 , H04B3/28 , H04B15/00 , H04N7/10 , G02B6/34
CPC分类号： H03H7/1758 , H03H11/24 , H03H7/065 , H04B15/00 , H04B3/28 , H04N7/104
摘要： An upstream ingress filter (300) for isolating upstream ingress noise on a bi-directional cable system having an upstream band and a downstream band for carrying upstream signals and downstream signals, respectively. The upstream ingress filter (300) includes a DC switching element (310) for changing the DC voltage on the cable system at said cable access unit and a switchable notch filter (340) that switches ON and OFF in response to the DC switching element. The notch filter isolates upstream ingress noise by attenuating upstream signals in the upstream band when the upstream ingress filter is ON. Both the DC switching element (310) and the notch filter (340) are connected in parallel to the cable (301).

53. 发明授权

US5705860A Inflight entertainment system having EMI and ESD improvements 失效
标题翻译：具有EMI和ESD改进的机载娱乐系统
公开(公告)号：US5705860A
公开(公告)日：1998-01-06
申请号：US625470
申请日：1996-03-29
申请人： Loi Ninh , Gerald Lester
发明人： Loi Ninh , Gerald Lester
IPC分类号： B64D11/00 , H04N7/18 , H05F3/02 , H05K9/00 , H04B3/28
CPC分类号： H04N7/18
摘要： A vehicle passenger information system, for example an inflight entertainment system, has a combination of improvements for reducing electromagnetic interference ("EMI") and electrostatic discharge ("ESD"). A microprocessor based system controller has a system controller chassis with a first conductive EMI shield layer, a low impedance aircraft chassis ground path directly electrically connected to the shield layer and to controller components. Additionally, a display unit has a chassis with a second conductive EMI shield layer enclosing a plurality of PCBs directly electrically connected to the shield layer. The display unit supports are grounded through a plurality of system connectors penetrating the display chassis and a low impedance display unit ground path directly electrically connects the two shield layers. A method of decreasing the EMI and ESD susceptibility of, and the levels of radiated EMI from, a vehicle entertainment system is also provided.
摘要翻译：车载乘客信息系统，例如飞行娱乐系统，具有减少电磁干扰（“EMI”）和静电放电（“ESD”）的改进的组合。基于微处理器的系统控制器具有系统控制器机架，其具有第一导电EMI屏蔽层，直接电连接到屏蔽层的低阻抗飞机底盘接地路径和控制器部件。此外，显示单元具有底架，其具有包围直接电连接到屏蔽层的多个PCB的第二导电EMI屏蔽层。显示单元支撑件通过穿透显示器底盘的多个系统连接器接地，并且低阻抗显示单元接地路径直接电连接两个屏蔽层。还提供了降低车辆娱乐系统的EMI和ESD敏感性以及辐射EMI水平的方法。

54. 发明授权

US5644574A Noise canceling single return conductor for multiple signal carrying conductors 失效
标题翻译：用于多个信号承载导线的降噪单回路导体
公开(公告)号：US5644574A
公开(公告)日：1997-07-01
申请号：US546363
申请日：1995-10-20
申请人： George A. Wiley
发明人： George A. Wiley
IPC分类号： H04B3/28 , H04L5/14 , H04L25/08 , H04B1/56
CPC分类号： H04L5/1423 , H04B3/28 , H04L25/08
摘要： A system for noise canceling using a single return conductor. The system employs a first unit, a full duplex communications path coupled to the first unit, and a second unit coupled to the first unit via the full duplex communications path. The full duplex communications path employs at least three conductors: a forward signal carrying conductor; a reverse signal carrying conductor; and a single return conductor. In order to perform noise canceling, the first unit may employ, for example, a first adder coupled to the reverse signal carrying conductor, and a first canceling impedance coupled between the single return conductor and a first unit ground. Similarly, the second unit 12 may employ a second adder coupled to the forward signal carrying conductor, and a second canceling impedance coupled between the single return conductor and a second unit ground.
摘要翻译：使用单个回路导体进行噪声消除的系统。系统采用第一单元，耦合到第一单元的全双工通信路径，以及经由全双工通信路径耦合到第一单元的第二单元。全双工通信路径采用至少三个导体：正向信号承载导体; 反向信号承载导体; 和单个回路导体。为了执行噪声消除，第一单元可以采用例如耦合到反向信号承载导体的第一加法器和耦合在单个返回导体和第一单元接地之间的第一抵消阻抗。类似地，第二单元12可以采用耦合到正向信号承载导体的第二加法器，以及耦合在单个返回导体和第二单元接地之间的第二抵消阻抗。

55. 发明授权

US5528088A Current mode coupler with improved grounding 失效
标题翻译：电流模式耦合器具有改进的接地
公开(公告)号：US5528088A
公开(公告)日：1996-06-18
申请号：US265772
申请日：1994-06-27
申请人： David O. Gallusser , James B. LeBaron
发明人： David O. Gallusser , James B. LeBaron
IPC分类号： H01R13/658 , H01R31/00 , H04B3/28 , H05K9/00
CPC分类号： H01R31/005 , H01R13/65802 , H04L25/0266
摘要： A current mode coupler for an unshielded twisted-pair cable includes an arrangement for establishing a low impedance, multiple point-of-contact electrical connection between a shielding base and cover. The grounding arrangement includes a conductive member on the cover which has an extension in the direction of assembly of the base to the cover, and resilient grounding fingers on the base for providing a wiping contact with the extensions on the conductive member when the base and cover are assembled to each other.
摘要翻译：用于非屏蔽双绞线电缆的电流模式耦合器包括用于在屏蔽底座和盖子之间建立低阻抗，多点接触电连接的装置。接地装置包括在盖上的导电构件，其具有在基座与盖的组装方向上的延伸部分，以及在基座上的弹性接地指状件，用于当基座和盖板上提供与导电构件上的延伸部分的擦拭接触彼此组装。

56. 发明授权

US5223806A Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces 失效
标题翻译：用于减少与计算机网络接口相关联的电磁干扰和发射的方法和装置
公开(公告)号：US5223806A
公开(公告)日：1993-06-29
申请号：US748947
申请日：1991-08-23
申请人： Robert A. Curtis , Dusan S. Skendzic
发明人： Robert A. Curtis , Dusan S. Skendzic
IPC分类号： H04B3/28
CPC分类号： H04B3/28
摘要： A computer network interface ("NIC") exhibits reduced electromagnetic interference and emission through capacitively coupling an output transformer center tap both to reference ground and to logic ground of the NIC's transceiver. Transmit signal lines on both sides of the transceiver are also capacitively coupled to both grounds. Other aspects of the invention reduce electromagnetic interference and emission through improvements in the construction of the NIC printed circuit board and the technique for intercoupling a plurality of NIC's using shielded twisted-pair cable.
摘要翻译：计算机网络接口（“NIC”）通过将输出变压器中心抽头电容耦合到参考接地和NIC收发器的逻辑地，显示出降低的电磁干扰和发射。收发器两侧的发射信号线也可电容耦合到两个接地。本发明的其它方面通过改进NIC印刷电路板的结构来降低电磁干扰和发射，以及使用屏蔽双绞线电缆耦合多个NIC的技术。

57. 发明授权

US4835394A Cable assembly for an electrical signal transmission system 失效
标题翻译：电信号传输系统的电缆组件
公开(公告)号：US4835394A
公开(公告)日：1989-05-30
申请号：US80289
申请日：1987-07-31
申请人： Douglas S. Steele
发明人： Douglas S. Steele
IPC分类号： H01R13/648 , H01B7/08 , H01B11/00 , H01B11/20 , H01R13/719 , H04B3/28 , H05K1/02 , H05K1/11
CPC分类号： H01B7/0861 , H01B11/203 , H04B3/28 , H05K1/0219 , H05K1/0215 , H05K1/117 , H05K2201/044
摘要： A cable assembly for an electrical signal transmission system comprises a plurality of elongated conductors, a conductive shield surrounding each conductor, and a dielectric layer between each shield and its respective conductor. The shielded conductors are embedded in a dielectric material and the dielectric material is wrapped in a double conductive shield. Adhesive layers are located between the double shield and the dielectric material and between the two shields making up the double shield. This cable assembly results in a signal transmission apparatus which has increased immunity to the effects of external electromagnetic fields, electrostatic charge, and mechanical vibration. It is particularly useful in transmitting low level signals produced by ionization detectors used in X-ray inspection apparatus.
摘要翻译：用于电信号传输系统的电缆组件包括多个细长导体，围绕每个导体的导电屏蔽以及每个屏蔽件及其相应导体之间的介电层。屏蔽导体嵌入电介质材料中，电介质材料被包裹在双重导电屏蔽中。粘合剂层位于双层屏蔽和电介质材料之间以及组成双层屏蔽的两个屏蔽之间。该电缆组件产生信号传输装置，其对外部电磁场，静电荷和机械振动的影响具有增强的抗扰性。在用于X射线检查装置中使用的电离检测器产生的低电平信号中特别有用。

58. 发明授权

US4751607A Communication line transient protection 失效
标题翻译：通讯线路瞬态保护
公开(公告)号：US4751607A
公开(公告)日：1988-06-14
申请号：US895224
申请日：1986-08-11
申请人： Douglas C. Smith
发明人： Douglas C. Smith
IPC分类号： H04B3/00 , H04B3/28 , H04M19/00 , H02H9/08
CPC分类号： H04B3/28
摘要： The severity of the problems of transmitting high speed data over a regular twisted wire pair are legendary. These problems arise from a variety of conditions, including the capacitance of the wire (which increases with length) and the propensity of unshielded wire to pickup high induced voltages. An arrangement is disclosed that is suitable for short, as well as long, wire distances and which also effectively eliminates the interference problem caused by induced voltages, including those causes by electrostatic discharge. This arrangement passes two twisted wire pairs through a series of ferrite cores. The twisted wire pairs coming out of the ferrite cores are terminated such that one of the pairs is connected to ground while the signal carrying twisted pair is connected to a small signal balun coil, pulse shaping circuit and low pass filter.
摘要翻译：通过普通双绞线传输高速数据的问题的严重性是传奇。这些问题出现在各种条件下，包括导线的电容（随着长度的增加而增加）和非屏蔽导线拾取高感应电压的倾向。公开了一种适用于短距离和长距离线路的布置，并且还有效地消除了由感应电压引起的干扰问题，包括那些由静电放电引起的电压。这种安排通过一系列铁氧体磁芯的两条双绞线对。从铁氧体磁芯出来的绞合线对终止，使得一对配对连接到地，而信号承载双绞线连接到小信号平衡 - 不平衡转换线圈，脉冲整形电路和低通滤波器。

59. 发明授权

US4580112A Active line filter for power line conducted interference 失效
标题翻译：有源线滤波器用于电力线传导干扰
公开(公告)号：US4580112A
公开(公告)日：1986-04-01
申请号：US608056
申请日：1984-05-08
申请人： Jeffrey K. Winslow , David F. Baretich
发明人： Jeffrey K. Winslow , David F. Baretich
IPC分类号： H02M1/14 , H04B3/28
CPC分类号： H04B3/28
摘要： A line filter for a power supply includes a differential amplifier which is driven from across an inductor in series with a principal current carrying path of the power supply. The differential amplifier output is connected to a capacitance returned to ground for canceling common mode interference as may be generated in the power supply.
摘要翻译：用于电源的线路滤波器包括差分放大器，其由与电源的主电流承载路径串联的电感器驱动。差分放大器输出连接到返回到地的电容，以消除在电源中可能产生的共模干扰。

60. 发明授权

US4520508A Subscriber terminal for monitoring radio-frequency signal ingress into cable television systems 失效
标题翻译：用于监控射频信号进入有线电视系统的用户终端
公开(公告)号：US4520508A
公开(公告)日：1985-05-28
申请号：US624804
申请日：1984-06-26
申请人： Harry J. Reichert, Jr.
发明人： Harry J. Reichert, Jr.
IPC分类号： H04B3/28 , H04N7/173 , H04H1/02 , H04N7/18
CPC分类号： H04B3/28 , H04N7/173
摘要： A cable television subscriber home terminal capable of transmitting information along a cable to a central station at one of a series of predetermined return frequencies includes a receiver tuned to monitor possible ingress into the system at selected frequencies within the range of the return system frequency. A signal representing the magnitude and frequency of the detected ingress signal modulates a return signal, which is transmitted along the cable system to the headend to provide information concerning the detected ingress signal.
摘要翻译：能够以一系列预定返回频率中的一个电缆将信息沿着电缆传送到中心站的有线电视用户家庭终端包括被调谐以监视在返回系统频率范围内的选定频率可能进入系统的接收机的接收机。表示检测到的入口信号的幅度和频率的信号调制沿着电缆系统传送到头端的返回信号，以提供关于检测到的入口信号的信息。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式