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    • 43. 发明授权
    • Apparatus and method for detecting frame synchronization pattern/word in
bit-stuffed digital data frame
    • 用于检测位填充数字数据帧中的帧同步模式/字的装置和方法
    • US5757869A
    • 1998-05-26
    • US508996
    • 1995-07-28
    • Jeffrey J. SandsMichael D. Turner
    • Jeffrey J. SandsMichael D. Turner
    • H04J3/06H04J3/07H04L7/00
    • H04J3/073H04J3/0608
    • A frame sync acquisition mechanism accurately locates a frame synchronization word within successive selectively bit-stuffed frames of data by not only looking for the frame sync word in the two expected alternative frame sync word locations based upon either the addition of stuff bits or the lack of such stuff bits, but also selectively examining a pair of additional potential locations, one of which precedes and the other of which succeeds the two expected alternative frame sync word locations. If an exact match with the frame sync word is located in either of the expected locations, that location is selected as the reference for the next succeeding frame. During the search of the next successive frame and for every succeeding frame, an attempt is made to initially match the frame sync word with in either of these expected locations. If unable to do so, the search is expanded to encompass the entire window of location uncertainty, so as to include the two additional locations. During this expanded search, that location which yields the smallest number of bit errors is declared as the reference location for the next succeeding frame. If there is a failure to find an exact match over the course of a plurality of successive frames, an out-of-sync condition is declared, and the frame sync acquisition of mechanism is re-initialized.
    • 帧同步获取机制通过不仅在两个预期的备选帧同步字位置中寻找帧同步字,而是基于填充位的添加或缺少 这样的填充位,而且还选择性地检查一对附加的潜在位置,其中一个位于两个预期的替代帧同步字位置之前和另一个之后。 如果与帧同步字的精确匹配位于预期位置中的任意一个位置,则选择该位置作为下一个后续帧的参考。 在搜索下一个连续的帧期间,并且对于每个后续的帧,尝试使帧同步字与这些预期位置中的任一个初始匹配。 如果不能这样做,搜索扩展到包含整个位置不确定性窗口,以便包括两个附加位置。 在这个扩展搜索期间,产生最小数量位错误的位置被声明为下一个后续帧的参考位置。 如果在多个连续帧的过程中找不到精确匹配的失败,则声明不同步状态,并重新初始化机制的帧同步获取。
    • 44. 发明授权
    • Method and apparatus for reducing waiting time jitter in pulse stuffing
synchronized digital communications
    • 减少脉冲填充同步数字通信中等待时间抖动的方法和装置
    • US5619506A
    • 1997-04-08
    • US429950
    • 1995-04-27
    • Richard A. BurchKevin W. SchneiderMichael D. Turner
    • Richard A. BurchKevin W. SchneiderMichael D. Turner
    • H04J3/07
    • H04J3/073
    • A jitter/wander reduction mechanism monitors the ratio of pulse stuffing, to detect whenever the pulse stuffing ratio is proximate a prescribed undesirable ratio of stuffs per stuffing opportunity, which causes the wander to be a large number of unit intervals. A stuffing pulse accumulator-controlled frequency shift control circuit monitors the signal produced by a multiplexer (and demultiplexer for full duplex mode) control logic circuit and incrementally adjusts, as necessary, the frequency of a synchronized clock signal input to the multiplexer (and demultiplexer). The magnitude of the incremental frequency shift is sufficient to drive the synchronized clock away from the frequency associated with the undesired stuff ratio to a frequency that is sufficiently separated from the undesired value to produce a stuffing ratio other than the undesired value and reduce the jitter/wander.
    • 抖动/漂移减少机制监测脉冲填充的比率,以便每当脉冲填充比接近于每个填充机会的填充物的规定的不期望比例时检测,这导致漂移是大量的单位间隔。 填充脉冲累加器控制的频移控制电路监视由多路复用器(和全双工模式的解复用器)控制逻辑电路产生的信号,并根据需要递增地调整输入到多路复用器(和解复用器)的同步时钟信号的频率, 。 增量频移的大小足以将同步时钟从与不需要的填充比相关联的频率驱动到与不期望值充分分离的频率,以产生除了不需要的值之外的填充比,并减少抖动/ 漫步。
    • 47. 发明授权
    • Systems and methods for unobtrusively testing optical fibers
    • 用于不引人注目的测试光纤的系统和方法
    • US08606117B1
    • 2013-12-10
    • US12783999
    • 2010-05-20
    • Michael D. TurnerLeif J. SandstromJohn Gordon BrooksKevin W. SchneiderDaniel M. Joffe
    • Michael D. TurnerLeif J. SandstromJohn Gordon BrooksKevin W. SchneiderDaniel M. Joffe
    • H04B10/04
    • G01M11/3118H04B10/071
    • A correlation optical time domain reflectometer (OTDR) system embeds an OTDR signal in a digital data signal that is to be converted into an optical signal and transmitted across an optical fiber to a remote receiver. In particular, the digital data signal is amplitude modulated with the OTDR signal, which is based on a pseudo noise (PN) sequence, such as an M-sequence. The amplitude modulation is relatively small, for example, less than about 10% of the digital data signal's peak amplitude in an effort to limit the OTDR signal's effect on communication performance. A sequence recovery element receives reflections from the optical fiber and converts the reflections to digital samples. Each digital sample from the sequence recovery element is correlated by correlators that respectively correspond to delays and, hence, locations along the optical fiber, and accumulators accumulate the correlation values from the correlators. Based on the accumulated values, the correlation OTDR system unobtrusively identifies anomaly locations along the optical fiber while payload data is being communicated across the fiber.
    • 相关光时域反射计(OTDR)系统将OTDR信号嵌入到要转换为光信号并通过光纤传输到远程接收器的数字数据信号中。 特别地,数字数据信号用OTDR信号进行幅度调制,OTDR信号基于诸如M序列的伪噪声(PN)序列。 幅度调制相对较小,例如小于数字数据信号峰值幅度的10%,以努力限制OTDR信号对通信性能的影响。 序列恢复元件从光纤接收反射并将反射转换成数字样本。 来自序列恢复元件的每个数字样本由分别对应于延迟的相关器和因此沿着光纤的位置相关联,并且累加器累积来自相关器的相关值。 基于累积值,相关性OTDR系统在通过光纤传送有效载荷数据的同时,明确地识别沿着光纤的异常位置。