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1. 发明专利

JP2013074628A Precise clock synchronization over optical fiber 审中-公开
标题翻译：精密时钟同步在光纤上
公开(公告)号：JP2013074628A
公开(公告)日：2013-04-22
申请号：JP2012212784
申请日：2012-09-26
申请人： Symmetricom Inc , シンメトリコム・インコーポレイテッドSymmetricom, Inc.
发明人： SANJAY MANI
IPC分类号： H04L7/00 , H04B10/075
CPC分类号： H04J14/0272 , H04J3/0667
摘要： PROBLEM TO BE SOLVED: To realize precise clock synchronization over an optical fiber.SOLUTION: A clock at a first network element that is connected to a second network element over a first optical link and a second optical link that are physically distinct from each other is aligned using optical timing signals having wavelengths different from each other. Transit delays between the first and second network elements may be determined using the same optical timing signals.
摘要翻译：要解决的问题：通过光纤实现精确的时钟同步。解决方案：使用具有彼此不同的波长的光学定时信号来对准在第一光学链路上连接到第二网络元件的第一网络时钟和物理上彼此不同的第二光学链路。可以使用相同的光学定时信号来确定第一和第二网络元件之间的传输延迟。版权所有（C）2013，JPO＆INPIT

2. 发明专利

TW200847697A 在已編碼環境之基於封包的視訊廣播系統中空間與時間之損失之決定 SPATIAL AND TEMPORAL LOSS DETERMINATION IN PACKET BASED VIDEO BROADCAST SYSTEM IN AN ENCRYPTED ENVIRONMENT 审中-公开
简体标题：在已编码环境之基于封包的视频广播系统中空间与时间之损失之决定 SPATIAL AND TEMPORAL LOSS DETERMINATION IN PACKET BASED VIDEO BROADCAST SYSTEM IN AN ENCRYPTED ENVIRONMENT
公开(公告)号：TW200847697A
公开(公告)日：2008-12-01
申请号：TW097106314
申请日：2008-02-22
申请人：聯合對稱有限公司 SYMMETRICOM, INC.
发明人：帕福恩A 馬漢達斯 MOHANDAS, PRAVEEN A.
IPC分类号： H04L , H04N
CPC分类号： H04L12/1868 , H04N7/165 , H04N21/2221 , H04N21/2381 , H04N21/2402 , H04N21/2404
摘要：一種用於在一已加密環境之一基於封包的視訊廣播系統中決定空間與時間之損失之方法,其涉及測量在一視訊流之一未加密頭端之視訊編碼層資訊及在同一視訊流之一已加密下游端之網路層資訊。視訊編碼層資訊與具有一對應時戳之網路層資訊相關聯以計算該空間與時間之損失。從包括存取單元、片或巨集區塊之該視訊流之離散片段接受視訊編碼層資訊及網路層資訊。使用該計算之空間與時間之損失來決定在該視訊流中之減損。
简体摘要：一种用于在一已加密环境之一基于封包的视频广播系统中决定空间与时间之损失之方法,其涉及测量在一视频流之一未加密头端之视频编码层信息及在同一视频流之一已加密下游端之网络层信息。视频编码层信息与具有一对应时戳之网络层信息相关联以计算该空间与时间之损失。从包括存取单元、片或宏区块之该视频流之离散片段接受视频编码层信息及网络层信息。使用该计算之空间与时间之损失来决定在该视频流中之减损。

3. 发明申请

WO2003084132A1 SYSTEM AND METHOD FOR GENERIC REPRESENTATION OF NETWORK ELEMENTS 审中-公开
标题翻译：网络元素一般表示的系统与方法
公开(公告)号：WO2003084132A1
公开(公告)日：2003-10-09
申请号：PCT/US2003/008752
申请日：2003-03-25
申请人： SYMMETRICOM, INC. , DHANDA, Dilip, S.
发明人： DHANDA, Dilip, S.
IPC分类号： H04L12/24
CPC分类号： H04L41/0213 , H04L41/022 , H04L41/0226
摘要： Systems and methods are provided for interfacing between an element management system and a network management system in a network. The network management system includes a first data structure and a second data structure.
摘要翻译：提供了系统和方法，用于在网络中的元件管理系统和网络管理系统之间进行接口连接。网络管理系统包括第一数据结构和第二数据结构。

4. 发明申请

WO2003047107A2 CORE SYNC MODULE 审中-公开
标题翻译：核心同步模块
公开(公告)号：WO2003047107A2
公开(公告)日：2003-06-05
申请号：PCT/US2002/036985
申请日：2002-11-15
申请人： SYMMETRICOM, INC. , ZAMPETTI, George P. , HAMILTON, Robert
发明人： ZAMPETTI, George P. , HAMILTON, Robert
IPC分类号： H03L
CPC分类号： H03L7/07 , H04J3/0688
摘要： Systems and methods are described for a core sync module. A method includes receiving a pair of input clock signals; utilizing a stratum clock state machine to control a multiplexer; utilizing the multiplexer to switch an input of a main clock between each of the pair of input clock signals; inducing a phase build-out activity; and transmitting an output clock signal. An apparatus includes a first input clock digital phase-locked loop; a second input clock digital phase-locked loop; a stratum clock state machine coupled to the first input clock digital phase-locked loop and to the second input clock digital phase-locked loop; and a main clock phase-locked loop coupled to the first input clock digital phase-locked loop, to the second input clock digital phase-locked and to the stratum clock state machine.
摘要翻译：为核心同步模块描述了系统和方法。一种方法包括：接收一对输入时钟信号; 利用层时钟状态机来控制多路复用器; 利用多路复用器在一对输入时钟信号中的每一个之间切换主时钟的输入; 引发相位活动; 并发送输出时钟信号。一种装置包括：第一输入时钟数字锁相环; 第二输入时钟数字锁相环; 层时钟状态机耦合到第一输入时钟数字锁相环和第二输入时钟数字锁相环; 以及耦合到第一输入时钟数字锁相环的主时钟锁相环，到第二输入时钟数字锁相和层时钟状态机。

5. 发明申请

WO0177705A3 GLOBAL POSITIONING SYSTEM RECEIVER CAPABLE OF FUNCTIONING IN THE PRESENCE OF INTERFERENCE 审中-公开
标题翻译：全球定位系统接收机可以在干扰存在的情况下进行功能化
公开(公告)号：WO0177705A3
公开(公告)日：2002-07-04
申请号：PCT/US0111431
申请日：2001-04-04
申请人： SYMMETRICOM INC , SHENOI KISHAN , HEINZL JOHANN , JACOBSEN GARY , YANG JINING
发明人： SHENOI KISHAN , HEINZL JOHANN , JACOBSEN GARY , YANG JINING
IPC分类号： G01S1/00 , H03J1/00 , H03J3/08 , G01S1/02 , G01S1/04 , H04B1/707
CPC分类号： G01S19/37 , G01S19/21 , H03J1/0008 , H03J3/08 , H04B1/7102
摘要： Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies; computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus, comprising: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.
摘要翻译：为能够在存在干扰的情况下起作用的GPS接收机描述系统和方法。一种方法包括检测干扰信号，包括：在频率范围上调谐带通滤波器; 并且在多个增量频率中的每一个处; 计算一组带通滤波器系数; 将一组带通滤波器系数发送到数字滤波器; 将具有超过2位的量化级的模数转换器输出反复变换为与数字滤波器一起输出的带通滤波器，以获得多个采样; 计算所述多个样本的平均值; 并将平均值与阈值进行比较以检测超过阈值的峰值。一种装置，包括：模拟射频电路; 耦合到所述模拟射频电路的模数转换器，所述模数转换器提供超过2位的量化级; 耦合到所述模数转换器的数字滤波器; 以及耦合到数字滤波器的数字电路。

6. 发明申请

WO0150727A3 DIGITAL SUBSCRIBER LOOP REPEATERS AND ASSOCIATED METHODS 审中-公开
标题翻译：数字订阅者循环重复和相关方法
公开(公告)号：WO0150727A3
公开(公告)日：2001-12-13
申请号：PCT/US0035714
申请日：2000-12-28
申请人： SYMMETRICOM INC , SHENOI KISHAN
发明人： SHENOI KISHAN
IPC分类号： H04M19/00 , H04L25/20
CPC分类号： H04M19/006
摘要： Systems and methods are described for digital subscriber loop repeaters. A method of transforming a digital subscriber loop signal includes providing the digital subscriber loop signal; and increasing a gain of the digital subscriber loop signal with a digital subscriber loop repeater. The systems and methods provide advantages because DSL can be provided over long loops and/or over coil loaded loops.
摘要翻译：为数字用户环路中继器描述了系统和方法。一种变换数字用户环路信号的方法包括提供数字用户环路信号; 并用数字用户环路中继器增加数字用户环路信号的增益。系统和方法提供了优点，因为DSL可以在长环路和/或线圈负载环路上提供。

7. 发明申请

WO1997037401A2 RADIO COMMUNICATION APPARATUS 审中-公开
标题翻译：无线电通信设备
公开(公告)号：WO1997037401A2
公开(公告)日：1997-10-09
申请号：PCT/GB1997000841
申请日：1997-03-26
申请人： SYMMETRICOM, INC. , LEISTEN, Oliver, Paul
发明人： SYMMETRICOM, INC.
IPC分类号： H01Q11/12
CPC分类号： H01Q11/08 , H01Q5/357
摘要： In a radio communication system operating in at least two spaced-apart frequency bands above 200 MHz, a quadrifilar helical antenna (1) having an elongate dielectric core with a relative dielectric constant greater than 5 has a conductive sleeve surrounding a proximal part of the core and a longitudinal feeder structure (1A) extending through the core to a connection with the helical antenna elements at a distal end of the core. The antenna (1) is operated in a first frequency band in which it exhibits a first, balanced mode of resonance characterised by current maxima and voltage minima at the connections of the helical elements to the feeder structure and at their junctions with the rim of the sleeve, and in a lower or higher second frequency band in which the antenna (1) exhibits a second, single-ended mode of resonance characterised by current maxima and voltage minima generally at the ends of the core and current minima and voltage maxima at one or more intermediate locations. To permit dual mode operation, the system includes an impedance-matching coupling stage (2) which may be a diplexer having filters coupled between a common port for the antenna (1) and further ports for connection to radio signal processing equipment such as a GPS receiver (4) and a mobile telephone (5) operating in the two frequency bands. The filters and impedance matching elements may be formed as microstrip elements on a single substrate.
摘要翻译：在高于200MHz的至少两个间隔开的频带中操作的无线电通信系统中，具有大于5的相对介电常数的细长介质芯的四极螺旋天线（1）具有包围芯的近端部分的导电套筒以及纵向进给结构（1A），其延伸穿过所述芯到与所述芯的远端处的所述螺旋天线元件的连接。天线（1）在第一频带中操作，其中它呈现出第一平衡谐振模式，其特征在于在螺旋元件到馈线结构的连接处的电流最大值和电压最小值，以及在与并且在较低或更高的第二频带中，其中天线（1）呈现第二单端谐振模式，其特征在于通常在芯的端部处的电流最大值和电压最小值，并且电流最小值和电压最大值在一个或更多的中间位置。为了允许双模式操作，该系统包括阻抗匹配耦合级（2），其可以是具有耦合在用于天线（1）的公共端口之间的滤波器的另一端口和用于连接到诸如GPS的无线电信号处理设备接收器（4）和在两个频带中操作的移动电话（5）。滤波器和阻抗匹配元件可以在单个衬底上形成为微带元件。

8. 发明申请

WO2008103170A1 ASSISTED WALL-CLOCK 审中-公开
标题翻译：辅助墙壁时钟
公开(公告)号：WO2008103170A1
公开(公告)日：2008-08-28
申请号：PCT/US2007/062452
申请日：2007-02-20
申请人： SYMMETRICOM, INC. , SHENOI, Kishan , ZAMPETTI, George, P.
发明人： SHENOI, Kishan , ZAMPETTI, George, P.
IPC分类号： H04J3/06
CPC分类号： H04L12/413 , G06F1/14 , H04J3/0664 , H04J3/0667
摘要： One embodiment of the present invention sets forth a method for extracting a frequency reference carried in the physical layer of the incoming signal, using it to stabilize the local oscillator, and generating a suitable estimate of the clock correction to obtain an accurate time-of-day information from the client wall-clock of a computing device. The enhanced Jam-Sync method includes the steps of performing iterations to derive the estimates of the time offset between the true time-of-day and the System Time Clock (STC) in the forward and reverse directions of data transmission and calculating an estimate of the overall clock correction value. With these steps, the negative effects of packet delay variation may be mitigated and a value necessary for correcting the STC within the client wall-clock is determined. Consequently, quality control of the client wall-clock is achieved at significantly reduced cost and decreased level of complexity relative to the prior art approaches.
摘要翻译：本发明的一个实施例提出了一种用于提取输入信号的物理层中承载的频率参考的方法，使用它来稳定本地振荡器，并且产生适当的时钟校正估计以获得准确的时间 - 来自计算设备的客户端时钟的日间信息。增强的Jam-Sync方法包括以下步骤：执行迭代以得出数据传输的正向和反向方向上的真实时间与系统时间时钟（STC）之间的时间偏移的估计，并且计算估计值整体时钟校正值。通过这些步骤，可以减轻分组延迟变化的负面影响，并且确定用于校正客户端挂钟内的STC所需的值。因此，相对于现有技术的方法，以显着降低的成本和降低的复杂程度来实现客户端时钟的质量控制。

9. 发明申请

WO2007137085A2 NETWORK TIME PROTOCOL PRECISION TIMESTAMPING SERVICE 审中-公开
标题翻译：网络时间协议精确时间服务
公开(公告)号：WO2007137085A2
公开(公告)日：2007-11-29
申请号：PCT/US2007/069066
申请日：2007-05-16
申请人： SYMMETRICOM, INC. , DOWD, Gregory, Louis
发明人： DOWD, Gregory, Louis
CPC分类号： H04J3/0673 , H04J3/0697 , H04L69/28
摘要： Embodiments of the present invention set forth a method and system for reducing uncertainty in receive and transmit timestamps created by an NTP server. The uncertainty in the receive timestamps is removed by recording the time-of-arrival in the hardware clock of the NTP server before the incoming packets may be delayed by traversing the various layers of software in a timestamping system. The uncertainty in the transmit timestamps is removed by giving the outgoing packets a timestamp in the future using an estimate of the transmission latency calculated by the latency estimator filter. Subsequently, the actual time-of-departure is used to re-calculate and update the estimate of the transmission latency. In this fashion, superior control of the timestamping function may be implemented in existing NTP servers in a manner that retains interworking compatibility with the current NTP standards.
摘要翻译：本发明的实施例提出了一种用于减少由NTP服务器创建的接收和发送时间戳的不确定性的方法和系统。通过在进入的分组可能通过遍历时间戳系统中的各种软件来延迟输入分组之前，通过记录到NTP服务器的硬件时钟的到达时间来消除接收时间戳的不确定性。通过使用由等待时间估计器滤波器计算的传输延迟的估计，在未来给出输出分组时间戳来消除传输时间戳中的不确定性。随后，实际的出发时间用于重新计算和更新传输延迟的估计。以这种方式，可以以保持与当前NTP标准的互通兼容性的方式在现有NTP服务器中实现对时间戳功能的优越控制。

10. 发明申请

WO9749171A2 DSP IMPLEMENTATION OF A CELLULAR BASE STATION RECEIVER 审中-公开
标题翻译：蜂窝基站接收机的DSP实现
公开(公告)号：WO9749171A2
公开(公告)日：1997-12-24
申请号：PCT/US9710497
申请日：1997-06-16
申请人： SYMMETRICOM INC
发明人： SHENOI KISHAN
IPC分类号： H03D3/00 , H04B1/30 , H04L27/14 , H04B1/10
CPC分类号： H03D3/007 , H04B1/30
摘要： Demodulating FM signals using digital signal processing extracts a carrier signal from digitized channel signals, multiplies the digital channel signal with this extracted carrier signal, and further filters out the carrier signal to produce the demodulated signal. The DSP technique first down converts a group of channels to baseband which are then processed through an A/D converter to produce a digitized composite signal. A bank of bandpass filters, typically based on FFT processors, applied to the composite signal produce (a group of) digitized channel signal(s). The digitized channel signal is then demodulated by recovering a carrier signal by digitally filtering, for example, using a Hilbert bandpass filter, the channel signal and digitally filtering the product of the carrier signal and the channel signal to recover the modulating voice signals.
摘要翻译：使用数字信号处理解调FM信号从数字信道信号中提取载波信号，将数字信道信号与该提取的载波信号相乘，并进一步滤除载波信号以产生解调信号。 DSP技术首先将一组通道转换为基带，然后通过A / D转换器处理基带，以产生数字化的复合信号。通常基于FFT处理器的一组带通滤波器应用于复合信号产生（一组）数字化的信道信号。然后通过例如使用希尔伯特带通滤波器，信道信号和数字滤波载波信号和信道信号的乘积进行数字滤波来恢复载波信号来解调数字化信道信号，以恢复调制语音信号。

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