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171 条记录 (耗时 0.016 秒)

    Method and circuitry for matching impedance
    96.
    发明授权
    Method and circuitry for matching impedance 有权
    用于匹配阻抗的方法和电路

    公开(公告)号：US08761384B2

    公开(公告)日：2014-06-24

    申请号：US13642138

    申请日：2011-08-24

    申请人： Zhuwei Yu

    发明人： Zhuwei Yu

    IPC分类号： H04M7/04 ,  H03H11/30 ,  H04M1/76 ,  H03H7/40

    CPC分类号： H03H11/30 ,  H03H7/40 ,  H04M1/76

    摘要： Disclosed are a method and a circuit for impedance matching. The method comprises: a peripheral impedance detection module detecting an impedance of a subscriber telephone and outputting information about the impedance of the subscriber telephone; an analog switch switching module providing an impedance matching path between the impedance of the subscriber telephone and an impedance matching module according to the information about the impedance of the subscriber telephone output by the peripheral impedance detection module; the impedance matching module providing a corresponding impedance through the impedance matching path provided by the analog switch switching module to match to said impedance of the subscriber telephone. By the present invention, the impedance matching is achieved when a wireless access box communicates with telephones with various impedance modes. The matching process is flexible, automatic, and does not need manual configuration, and the technology is simple, reliable, and of low cost.

    摘要翻译： 公开了一种用于阻抗匹配的方法和电路。 该方法包括：外围阻抗检测模块，其检测用户电话的阻抗并输出关于用户电话的阻抗的信息; 模拟开关切换模块，根据关于由外围阻抗检测模块输出的用户电话的阻抗的信息，在用户电话的阻抗与阻抗匹配模块之间提供阻抗匹配路径; 阻抗匹配模块通过由模拟开关切换模块提供的阻抗匹配路径提供相应的阻抗，以匹配用户电话的所述阻抗。 通过本发明，当无线接入盒与具有各种阻抗模式的电话通信时，实现了阻抗匹配。 匹配过程灵活，自动，不需要手动配置，技术简单，可靠，成本低。

    Method and apparatus for subscriber line control circuit
    98.
    发明授权
    Method and apparatus for subscriber line control circuit 有权
    用户线路控制电路的方法和装置

    公开(公告)号：US07260212B1

    公开(公告)日：2007-08-21

    申请号：US11693718

    申请日：2007-03-30

    申请人： Peter Holzmann

    发明人： Peter Holzmann

    IPC分类号： H04M1/00 ,  H04M9/00

    CPC分类号： H04M1/76 ,  H04M1/738

    摘要： A subscriber line interface circuit apparatus includes a linefeed circuit and a subscriber line control circuit (SLCC). In an embodiment, the linefeed circuit includes a signal conversion circuit which provides a differential mode signal and a common mode signal in response to at least the tip signal and the ring signal from the subscriber loop. The linefeed circuit includes a tip control circuit and a ring control circuit. In an embodiment, the SLCC is provided in a single integrated circuit chip and is coupled to the linefeed circuit which isolates the SLCC from the tip or ring signals. The SLCC includes a first and a second differential mode inputs for receiving the differential mode signal, and a common-mode input for receiving the common-mode signal. In an embodiment, the SLCC also provides various tip and ring control signals to the tip control circuit and the ring control circuit, respectively.

    摘要翻译： 用户线路接口电路装置包括线路馈送电路和用户线路控制电路（SLCC）。 在一个实施例中，线路馈送电路包括信号转换电路，其响应于至少来自用户环路的尖端信号和振铃信号，提供差模信号和共模信号。 换行电路包括尖端控制电路和环形控制电路。 在一个实施例中，SLCC设置在单个集成电路芯片中，并且耦合到线路馈送电路，其将SLCC与尖端或环形信号隔离。 SLCC包括用于接收差分模式信号的第一和第二差分模式输入，以及用于接收共模信号的共模输入。 在一个实施例中，SLCC还分别向尖端控制电路和环控制电路提供各种尖端和环控制信号。

    Direct digital access arrangement circuitry and method for connecting to phone lines
    99.
    发明授权
    Direct digital access arrangement circuitry and method for connecting to phone lines 失效
    用于连接到电话线的直接数字接入安排电路和方法

    公开(公告)号：US07200167B2

    公开(公告)日：2007-04-03

    申请号：US10127285

    申请日：2002-04-22

    申请人： Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    发明人： Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC分类号： H04B1/38 ,  H04L5/16

    CPC分类号： H04M1/573 ,  H04L7/033 ,  H04L25/0266 ,  H04L25/06 ,  H04M1/76 ,  H04M3/007 ,  H04M11/06 ,  H04M19/001 ,  H04M19/02

    摘要： An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

    摘要翻译： 提供了一种适用于电话，医疗仪器，工业过程控制和其他应用的隔离系统。 本发明的优选实施例包括电容隔离屏障，通过数字信号传送数字信号。 该系统提供跨越隔离屏障的通信手段，其高度免疫幅度和相位噪声干扰。 可以在隔离屏障的一侧采用时钟恢复电路，从跨屏障通信的数字信号提取定时信息，并且滤除在屏障处引入的相位噪声的影响。 Δ-Σ转换器可以设置在隔离屏障的两侧以在模拟和数字域之间转换信号。 隔离电源也可以设置在屏障的隔离侧上，由此响应于穿过隔离屏障接收的数字数据产生直流电流。 最后，提供双向隔离系统，由此使用单对隔离电容器实现数字信号的双向通信。 在优选实施例中，跨屏障通信的数字数据由与其他数字控制，信令和成帧信息在时间上多路复用的数字delta-sigma数据信号组成。

    Apparatus for ring-back constriction
    100.
    发明授权
    Apparatus for ring-back constriction 有权

    公开(公告)号：US07155005B2

    公开(公告)日：2006-12-26

    申请号：US10091451

    申请日：2002-03-07

    申请人： Chi Chang ,  Chin-Hsien Yen

    发明人： Chi Chang ,  Chin-Hsien Yen

    IPC分类号： H03K17/16

    CPC分类号： H04M1/76 ,  B60R16/03

    摘要： An apparatus for ring-back constriction is provided. The apparatus includes a comparator, a termination controller, a termination variable resistor, a constriction controller, and a constriction variable resistor. The comparator is coupled to the transmission line, for comparing the line signal with a reference voltage, and accordingly outputting a comparison signal. The termination controller is coupled to the comparator, for outputting a termination control signal to adjust the resistance of the termination variable resistor. The constriction controller is coupled to the comparator for outputting a constriction signal to adjust the resistance of the constriction variable resistor. The ring-back effect is constricted due to impedance matchtermination voltage when an undershot occurs.