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公开(公告)号：US20100309805A1
公开(公告)日：2010-12-09
申请号：US12793643
申请日：2010-06-03
IPC分类号： H04L12/26
CPC分类号： H04L12/2801 , H04L43/50
摘要： In order to measure the performance of a DOCSIS upstream channel as well as to locate impairments, a special test signal is transmitted in a time slot of the upstream channel by a test instrument positioned anywhere within the CATV plant. A second test instrument, located at the termination point of the upstream plant, then detects, recovers, and processes the test signal in order to complete the measurement. The typical methods used to detect and recover bursted signals within a DOCSIS upstream channel use precise timing information transmitted in a corresponding DOCSIS downstream channel. Unfortunately, the downstream channel and thus the precise timing information are not always available to the secondary test instrument. The present invention also describes an apparatus and method for detecting a bursted test signal without the use of the DOCSIS upstream channel timing.
摘要翻译： 为了测量DOCSIS上行信道的性能以及定位损伤，通过位于CATV工厂内任何地方的测试仪器，在上游信道的时隙中发送特殊测试信号。 位于上游工厂终端的第二个测试仪器，然后检测，恢复和处理测试信号，以完成测量。 用于检测和恢复DOCSIS上行信道中的突发信号的典型方法使用在相应DOCSIS下行信道中发送的精确定时信息。 不幸的是，下游通道和精确的定时信息并不总是适用于二次测试仪器。 本发明还描述了一种用于在不使用DOCSIS上行信道定时的情况下检测突发测试信号的装置和方法。
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公开(公告)号：US08762088B2
公开(公告)日：2014-06-24
申请号：US13361763
申请日：2012-01-30
摘要： Systems and methods for quantifying the suitability of a coax network segment to support MoCA communications, comprising: transmitting a test signal associated with MoCA communications through the segment's first end; receiving the test signal through the segment's second end; determining a response function; determining a channel degradation reference based on the highest power level of the response function and a predetermined reference; calculating subcarrier degradation for each MoCA subcarrier, in accordance with the difference between the channel degradation reference and the subcarrier response function; and quantifying the suitability of the segment to support MoCA communications from the first end to the second end in accordance with the subcarrier degradation of all subcarriers in the response function.
摘要翻译： 用于量化同轴电缆网段以支持MoCA通信的适用性的系统和方法包括：通过该段的第一端发送与MoCA通信相关的测试信号; 通过该段的第二端接收测试信号; 确定响应函数; 基于所述响应函数的最高功率电平和预定参考来确定信道劣化参考; 根据信道劣化参考与子载波响应函数之间的差异，计算每个MoCA副载波的副载波劣化; 并且根据响应函数中的所有子载波的子载波劣化，量化该段的适用性以支持从第一端到第二端的MoCA通信。
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公开(公告)号：US08558552B2
公开(公告)日：2013-10-15
申请号：US12889969
申请日：2010-09-24
IPC分类号： G01R31/11
摘要： A method of characterizing a wiring network is implemented in a system which includes a test controller and at least two probes. On commands from the test controller, at least one of the probes changes its impedance between the nominal impedance of the wiring network and a mismatch impedance. Reflectometry measurements are performed before and after of switching the impedance of the second probe. At the first probe, an RF signal is generated and a reflected signal is measured. Then, the impedance of the second probe is changed, and again an RF signal is generated and a reflected signal is measured at the first probe. Additionally, a frequency response may be measured at the second probe. The results of the measurements are used for characterization of a transmission line between the first and second probes.
摘要翻译： 一种表征布线网络的方法在包括测试控制器和至少两个探针的系统中实现。 在来自测试控制器的指令中，至少有一个探头改变其在布线网络的标称阻抗和失配阻抗之间的阻抗。 在切换第二探针的阻抗之前和之后进行反射测量。 在第一次探测时，产生RF信号并测量反射信号。 然后，改变第二探针的阻抗，并且再次产生RF信号，并且在第一探针处测量反射信号。 另外，可以在第二探针处测量频率响应。 测量结果用于表征第一和第二探针之间的传输线。
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公开(公告)号：US08310940B2
公开(公告)日：2012-11-13
申请号：US12793643
申请日：2010-06-03
CPC分类号： H04L12/2801 , H04L43/50
摘要： In order to measure the performance of a DOCSIS upstream channel as well as to locate impairments, a special test signal is transmitted in a time slot of the upstream channel by a test instrument positioned anywhere within the CATV plant. A second test instrument, located at the termination point of the upstream plant, then detects, recovers, and processes the test signal in order to complete the measurement. The typical methods used to detect and recover bursted signals within a DOCSIS upstream channel use precise timing information transmitted in a corresponding DOCSIS downstream channel. Unfortunately, the downstream channel and thus the precise timing information are not always available to the secondary test instrument. The present invention also describes an apparatus and method for detecting a bursted test signal without the use of the DOCSIS upstream channel timing.
摘要翻译： 为了测量DOCSIS上行信道的性能以及定位损伤，通过位于CATV工厂内任何地方的测试仪器，在上游信道的时隙中发送特殊测试信号。 位于上游工厂终端的第二个测试仪器，然后检测，恢复和处理测试信号，以完成测量。 用于检测和恢复DOCSIS上行信道中的突发信号的典型方法使用在相应DOCSIS下行信道中发送的精确定时信息。 不幸的是，下游通道和精确的定时信息并不总是适用于二次测试仪器。 本发明还描述了一种用于在不使用DOCSIS上行信道定时的情况下检测突发测试信号的装置和方法。
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公开(公告)号：US20150009795A1
公开(公告)日：2015-01-08
申请号：US14323071
申请日：2014-07-03
CPC分类号： H04B3/46 , H04L43/0847 , H04L43/0858 , H04L43/106 , H04L43/50 , H04L69/22 , H04W24/08
摘要： Apparatus and method are provided for obtaining an upstream signal spectrum as it was during a time of transmission of a received upstream data packet. The apparatus includes an analog-to-digital converter (ADC), a packet detector coupled to ADC, and a spectrum calculation unit coupled to the ADC and the packet detector. In operation, the spectrum calculation unit computes a spectrum of the digitized upstream signal as it was between the start and end times of the first packet. As a result, the obtained spectrum is representative of a condition of the transmission path during transmission of the upstream data packet.
摘要翻译： 提供装置和方法，用于在接收到的上行数据分组的传输时间内获得上行信号频谱。 该装置包括模数转换器（ADC），耦合到ADC的分组检测器以及耦合到ADC和分组检测器的频谱计算单元。 在操作中，频谱计算单元计算数字化的上行信号的频谱，就像在第一分组的开始和结束时间之间一样。 结果，所获得的频谱表示上行数据分组的发送期间的传输路径的条件。
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公开(公告)号：US08189651B2
公开(公告)日：2012-05-29
申请号：US12413086
申请日：2009-03-27
CPC分类号： H04B17/309 , H04B17/21
摘要： The invention relates to a method for measuring Hum on a digital QAM carrier using a testing device for testing digital TV signals including a QAM demodulator therein, and to a testing device implementing the method. A micro-controller is used to sample a register associated with an AGC circuit in the QAM demodulator, and to process the collected register values to obtain one or more Hum characteristics.
摘要翻译： 本发明涉及一种使用测试装置测量数字QAM载波的方法，该测试装置用于测试其中包括QAM解调器的数字电视信号，以及实施该方法的测试装置。 微控制器用于对与QAM解调器中的AGC电路相关联的寄存器进行采样，并处理收集的寄存器值以获得一个或多个Hum特性。
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公开(公告)号：US6041076A
公开(公告)日：2000-03-21
申请号：US982831
申请日：1997-12-02
CPC分类号： H04B17/327
摘要： A signal power measurement apparatus for measuring the power of a first signal, with the first signal comprising a carrier signal modulated by an information signal. One embodiment of the present invention includes a signal power measurement apparatus comprising a RF receiver, an A/D converter, and a digital signal processing circuit. The RF receiver is operable to receive a first signal and generate an intermediate signal, with the intermediate signal comprising at least a portion of the first signal and having a bandwidth and a cutoff frequency. The A/D converter is operably connected to the RF receiver to receive the intermediate signal. The A/D converter generates a digital intermediate signal based on the intermediate signal, the digital intermediate signal having a sample rate less than twice the cutoff frequency. The digital signal processing circuit is operable to perform a power measurement on the digital intermediate signal, with the power measurement being representative of the power of at least a portion of the first signal.
摘要翻译： 一种用于测量第一信号的功率的信号功率测量装置，其中第一信号包括由信息信号调制的载波信号。 本发明的一个实施例包括一个包括RF接收机，A / D转换器和数字信号处理电路的信号功率测量装置。 RF接收器可操作以接收第一信号并产生中间信号，其中中间信号包括第一信号的至少一部分并具有带宽和截止频率。 A / D转换器可操作地连接到RF接收器以接收中间信号。 A / D转换器基于中间信号产生数字中间信号，数字中间信号的采样率小于截止频率的两倍。 数字信号处理电路可操作以对数字中间信号执行功率测量，功率测量代表第一信号的至少一部分的功率。
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公开(公告)号：US20080298270A1
公开(公告)日：2008-12-04
申请号：US12131700
申请日：2008-06-02
申请人： Daniel K. Chappell , David Hering , Michael J. Kunczt , Kelly Watts , Adam D. Gray , David W. Jones
发明人： Daniel K. Chappell , David Hering , Michael J. Kunczt , Kelly Watts , Adam D. Gray , David W. Jones
IPC分类号： H04L12/26
CPC分类号： H04L12/2801 , H04L43/045 , H04L43/0847 , H04L43/16
摘要： The problem is that a measurement of the average signal quality (average modulation error ratio), does not identify poor quality signals that may be originating from an individual cable modem. The device of the present invention displays the modulation error ratio (MER) for each packet received. Since the media access control (MAC) address is associated with a packet received from an individual cable modem, a graph displaying the MER for each packet received is also displaying the MER for signals from the individual cable modems. Thus a technician viewing the display will be able to identify whether a low MER is a result of an impairment in the network or the from an individual cable modem.
摘要翻译： 问题在于平均信号质量（平均调制误差比）的测量不能识别可能源自个别电缆调制解调器的质量差的信号。 本发明的装置显示接收的每个分组的调制误差率（MER）。 由于媒体访问控制（MAC）地址与从单个电缆调制解调器接收到的分组相关联，所以显示接收到的每个分组的MER的图形也显示来自各个电缆调制解调器的信号的MER。 因此，观看显示器的技术人员将能够识别低MER是否是网络损坏或来自单个电缆调制解调器的结果。
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公开(公告)号：US06961370B2
公开(公告)日：2005-11-01
申请号：US09821582
申请日：2001-03-29
申请人： Daniel K. Chappell
发明人： Daniel K. Chappell
CPC分类号： H04B3/46
摘要： An apparatus, system, and method, for determining the total frequency response of a communication system, include one or more testers each having a tuner, digital demodulation circuitry, and a controller that measures an absolute power level at the tester location for a particular channel and that measures a relative frequency response for the channel based on the tap weight coefficients from the digital demodulation circuitry. The absolute and relative measurements are combined and then recorded by each tester. The combined values of two or more testers are compared to determine the total frequency response of the communication system. The relative response measurements are converted from time domain to frequency domain by fast Fourier transformation. The controllers maintain a channel plan for sequencing the sweeping of consecutive channels.
摘要翻译： 用于确定通信系统的总频率响应的装置，系统和方法包括一个或多个测试器，每个测试器都具有调谐器，数字解调电路和控制器，该测试器测量测试器位置处的特定信道的绝对功率电平 并且基于来自数字解调电路的抽头权重系数来测量信道的相对频率响应。 将绝对和相对测量结合在一起，然后由每个测试仪记录。 比较两个或多个测试仪的组合值，以确定通信系统的总频率响应。 相对响应测量通过快速傅里叶变换从时域转换到频域。 控制器保持用于顺序扫描连续通道的通道计划。
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10.发明授权Method and apparatus for direct detection of communication system leakage signals 失效用于直接检测通信系统泄漏信号的方法和装置公开(公告)号：US06313874B1
公开(公告)日：2001-11-06
申请号：US08971906
申请日：1997-11-17
IPC分类号： H04N1702
CPC分类号： H04N17/00 , H04B17/309
摘要： A receiver circuit, which may be used in a leakage detector, includes an RF input, a narrow band filter, and a direct demodulator. The leakage detector in which the receiver circuit may be used is operable to measure leakage in a communication system, the communication system operable to transmit broadband communication signals comprising one or more radio frequency carrier signals modulated by one or more baseband communication signals, wherein each radio frequency carrier signal has a channel frequency. Essentially, the exemplary receiver circuit according to the present invention is operable to generate a baseband leakage signal. To this end, the RF input is coupled to a source of broadband communication signals and receives a broadband communication signal therefrom, the broadband comnunication signal including a first signal associated with a first channel frequency. The narrow band filter is operably coupled to the RF input to receive at least a portion of the broadband communication signal and producing a filtered first signal therefrom, the narrow band filter having a Q value at least on the order of 1000 and further having a pass band that includes the first channel frequency. The direct demodulator is coupled to the narrow band filter, and is operable to generate a baseband leakage signal from the filtered first signal.
摘要翻译： 可用于泄漏检测器的接收器电路包括RF输入，窄带滤波器和直接解调器。 可以使用接收器电路的泄漏检测器可操作以测量通信系统中的泄漏，该通信系统可操作以发送包括由一个或多个基带通信信号调制的一个或多个射频载波信号的宽带通信信号，其中每个无线电 频率载波信号具有信道频率。 本质上，根据本发明的示例性接收机电路可操作以产生基带泄漏信号。 为此，RF输入耦合到宽带通信信号源并从其接收宽带通信信号，该宽带通信信号包括与第一信道频率相关联的第一信号。 窄带滤波器可操作地耦合到RF输入端以接收宽带通信信号的至少一部分并从其产生经滤波的第一信号，窄带滤波器具有至少大约1000级的Q值，并且还具有通 包含第一个频道的频段。 直接解调器耦合到窄带滤波器，并且可操作以从滤波的第一信号产生基带泄漏信号。
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