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    • 2. 发明授权
    • Solid state relay
    • 固态继电器
    • US4431871A
    • 1984-02-14
    • US341266
    • 1982-01-21
    • Vinita Gupta
    • Vinita Gupta
    • H04M3/02H03K17/687H03K17/693H04M19/00
    • H03K17/693Y10T307/658
    • A solid state relay provides for a discontinuous transfer contact function. The solid state relay includes a first field effect transistor (FET) in a first switch, and second and third FETs in a second switch. The first and second FETs are each connected with AC responsive bias circuits for biasing the respective FETs into a non conductive condition. A control circuit operates the first and second switches to provide a transfer contact function. In a switching transition between a supply of a talking battery via the second switch, to a telephone line, to a supply of a ringing battery line via the first switch to the telephone line, the third FET is operated to increase impedance between the talking battery supply and the second FET, to permit AC voltage from the ringing battery supply to bias the second FET OFF.
    • 固态继电器提供不连续的转移接触功能。 固态继电器包括第一开关中的第一场效应晶体管(FET),以及第二开关中的第二和第三FET。 第一和第二FET各自与AC响应偏置电路连接,用于将各个FET偏置成非导通状态。 控制电路操作第一和第二开关以提供转移接触功能。 在通过第二开关供电的通话电池与电话线之间的切换转换中,通过第一开关向电话线提供振铃电池线,第三FET被操作以增加通话电池之间的阻抗 电源和第二FET,以允许来自振铃电池电源的AC电压将第二FET偏置。
    • 3. 发明申请
    • Method and apparatus for detecting and compensating for jitter in a communications network
    • 用于检测和补偿通信网络中的抖动的方法和装置
    • US20080225898A1
    • 2008-09-18
    • US11811723
    • 2007-06-12
    • David A. DeLewVinita GuptaRobert S. LarvenzJoseph Golja
    • David A. DeLewVinita GuptaRobert S. LarvenzJoseph Golja
    • H04J3/06H04J14/08
    • H04J3/0652H04J3/14H04L7/0083H04Q11/0067H04Q2011/0045H04Q2011/0083
    • Jitter in a clock signal can cause communications faults in communications networks, such as in networks in which downstream nodes use recovered clock signals as timing for upstream communications. An embodiment of the present invention detects and compensates for jitter in a network by recovering a reference clock associated with communications signals between nodes, such as an Optical Line Terminal (OLT) and Optical Network Terminal (ONT) in a Passive Optical Network (PON). A local clock is synchronized with the reference clock. Jitter induced faults may be detected and compensated for by increasing the synchronization rate, then decreasing the synchronization rate until jitter induced faults begin to occur. A loss or change in a rate of communications errors occurring as a function of the synchronization rate may be monitored and reported to a system operator. Compensating for jitter by adjusting the synchronization rate provides for robust communications between network nodes.
    • 时钟信号中的抖动可能导致通信网络中的通信故障,例如在下游节点使用恢复的时钟信号作为上行通信定时的网络中。 本发明的实施例通过恢复与无源光网络(PON)中的光线路终端(OLT)和光网络终端(ONT)等节点之间的通信信号相关联的参考时钟来检测和补偿网络中的抖动, 。 本地时钟与参考时钟同步。 可以通过增加同步速率来检测和补偿抖动引起的故障,然后降低同步速率,直到抖动引起的故障开始发生。 作为同步速率的函数发生的通信错误的速率的丢失或改变可以被监视并被报告给系统操作者。 通过调整同步速率来补偿抖动提供网络节点之间的稳健通信。
    • 7. 发明授权
    • Method and apparatus for detecting and compensating for jitter in a communications network
    • 用于检测和补偿通信网络中的抖动的方法和装置
    • US07660333B2
    • 2010-02-09
    • US11811723
    • 2007-06-12
    • David A. DeLewVinita GuptaRobert S. LarvenzJoseph Golja
    • David A. DeLewVinita GuptaRobert S. LarvenzJoseph Golja
    • H04J3/06H04J3/00H04L7/00
    • H04J3/0652H04J3/14H04L7/0083H04Q11/0067H04Q2011/0045H04Q2011/0083
    • Jitter in a clock signal can cause communications faults in communications networks, such as in networks in which downstream nodes use recovered clock signals as timing for upstream communications. An embodiment of the present invention detects and compensates for jitter in a network by recovering a reference clock associated with communications signals between nodes, such as an Optical Line Terminal (OLT) and Optical Network Terminal (ONT) in a Passive Optical Network (PON). A local clock is synchronized with the reference clock. Jitter induced faults may be detected and compensated for by increasing the synchronization rate, then decreasing the synchronization rate until jitter induced faults begin to occur. A loss or change in a rate of communications errors occurring as a function of the synchronization rate may be monitored and reported to a system operator. Compensating for jitter by adjusting the synchronization rate provides for robust communications between network nodes.
    • 时钟信号中的抖动可能导致通信网络中的通信故障,例如在下游节点使用恢复的时钟信号作为上行通信定时的网络中。 本发明的实施例通过恢复与无源光网络(PON)中的光线路终端(OLT)和光网络终端(ONT)等节点之间的通信信号相关联的参考时钟来检测和补偿网络中的抖动, 。 本地时钟与参考时钟同步。 可以通过增加同步速率来检测和补偿抖动引起的故障,然后降低同步速率,直到抖动引起的故障开始发生。 作为同步速率的函数发生的通信错误的速率的丢失或改变可以被监视并被报告给系统操作者。 通过调整同步速率来补偿抖动提供网络节点之间的稳健通信。
    • 9. 发明授权
    • Square root circuit
    • 平方根电路
    • US4617427A
    • 1986-10-14
    • US701288
    • 1985-02-13
    • Mathew P. VeaVinita Gupta
    • Mathew P. VeaVinita Gupta
    • H04Q1/457H04M1/50G06F15/31
    • H04Q1/457
    • In a telephone signalling detector of the cross-correlation type, samples from a selected communications channel are multiplied with sine and cosine coefficients of different frequencies. The resulting sine and cosine products for each frequency are separately accumulated over a period of time after which the accumulated results are each squared and then summed for the individual frequencies. A series of sums of squares is compared in accordance with predetermined tone detection parameters to determine the presence or absence of a signalling tone defined by the coefficients. In a telephone signalling detector intended to detect any of a large family of specified signalling tones in any of a plurality of channels, the square root value of each of the sums of squares is typically provided by digital circuitry for subsequent use in a processor which is operated to complete the tone detection function in accordance with program instructions. A cost reduced square root circuit provides the square root values from a look-up ROM (read-only-memory) on a prompt and regular basis. In the square root circuit a large sum of squares is shifted toward lesser significance and a smaller sum of squares is shifted toward greater significance by means of a logic controlled shift register. Thereafter only a central portion of the shift register content is used along with a corresponding shift record to periodically address the look-up ROM.
    • 在互相关类型的电话信令检测器中,来自所选择的通信信道的采样与不同频率的正弦和余弦系数相乘。 每个频率的所得到的正弦和余弦乘积在一段时间内分别累积,之后累积结果各自平方,然后针对各个频率求和。 根据预定的音调检测参数来比较一系列平方和,以确定由系数定义的信令音的存在或不存在。 在旨在检测多个通道中的任何一个中的任何特定信令音调的任何一个的电话信令检测器中,每个平方和的平方根通常由数字电路提供,用于随后在处理器中使用 根据程序指令操作完成音调检测功能。 成本降低的平方根电路在快速和定期的基础上从查找ROM(只读存储器)提供平方根值。 在平方根电路中,通过逻辑控制的移位寄存器,大的平方和向着较小的显着性移动并且较小的平方和向着更大的显着性移动。 此后,只有移位寄存器内容的中心部分与相应的移位记录一起使用以周期性地寻址查找ROM。