公开(公告)号：US06310646B1

公开(公告)日：2001-10-30

申请号：US08979104

申请日：1997-11-26

申请人： Pingnan Shi ,  Andrew E. Bowyer ,  Qin Zhang

发明人： Pingnan Shi ,  Andrew E. Bowyer ,  Qin Zhang

IPC分类号： H04N1702

CPC分类号： H04N17/00 ,  H04B17/23 ,  H04B17/309 ,  H04N5/4446 ,  H04N5/455 ,  H04N21/44209 ,  H04N21/6118

摘要： Disclosed are method and apparatus which measure signal level of an RF signal. The measured RF signal includes a baseband signal modulated onto a first carrier signal having a first frequency and the baseband signal includes program information and control information. The method and apparatus digitize the RF signal which includes the baseband control information and determine a signal level measurement from the baseband control information in the digitized RF signal. Furthermore, method and apparatus are disclosed which determine from the digitized RF signal whether a tagging signal is present in the RF signal.

摘要翻译： 公开了测量RF信号的信号电平的方法和装置。 测量的RF信号包括调制到具有第一频率的第一载波信号的基带信号，并且基带信号包括节目信息和控制信息。 该方法和装置对包括基带控制信息的RF信号进行数字化，并根据数字化RF信号中的基带控制信息确定信号电平测量。 此外，公开了从数字化RF信号确定RF信号中是否存在标记信号的方法和装置。

公开(公告)号：US5982165A

公开(公告)日：1999-11-09

申请号：US767991

申请日：1996-11-29

申请人： Andrew E. Bowyer ,  Adam A. Nowotarski ,  Pingnan Shi ,  Qin Zhang

发明人： Andrew E. Bowyer ,  Adam A. Nowotarski ,  Pingnan Shi ,  Qin Zhang

IPC分类号： G01R19/00 ,  G01R23/04

CPC分类号： G01R19/0007

摘要： An RF circuit for use as a front end for a combined leakage signal detector and signal level monitor includes a shared frequency conversion stage utilized for both leakage signals and signal level monitoring ("SLM") signals. One embodiment of the present invention includes an RF circuit comprising a first RF input, a second RF input, a frequency conversion circuit and a coupling device. The first RF input is operable to receive first signals to be monitored, the first signals being in a first frequency range. The second RF input is operable to receive leakage signals to be detected, the leakage signals also being in a first frequency range. The frequency conversion circuit is operable to convert signals in the first frequency range to signals in a second frequency range, the frequency conversion circuit operable to receive unconverted first signals and unconverted leakage signals and produce output signals therefrom. The output signals produced by the frequency conversion stage have a frequency in the second frequency range. The coupling device alternately connects the first RF input to the frequency conversion circuit and the second RF input to the frequency conversion circuit. The output signal may then be provided to a suitable measurement circuit that performs leakage signal detection or signal level monitoring using known methods.

摘要翻译： 用作组合泄漏信号检测器和信号电平监视器的前端的RF电路包括用于泄漏信号和信号电平监视（“SLM”）信号的共享变频级。 本发明的一个实施例包括包括第一RF输入，第二RF输入，频率转换电路和耦合装置的RF电路。 第一RF输入可操作以接收待监视的第一信号，第一信号处于第一频率范围。 第二RF输入可操作以接收待检测的泄漏信号，泄漏信号也处于第一频率范围内。 频率转换电路可操作以将第一频率范围内的信号转换为第二频率范围内的信号，该频率转换电路可操作以接收未转换的第一信号和未转换的泄漏信号并从其产生输出信号。 由变频级产生的输出信号具有第二频率范围内的频率。 耦合装置将第一RF输入交替地连接到频率转换电路，将第二RF输入交替地连接到频率转换电路。 然后可以将输出信号提供给使用已知方法进行泄漏信号检测或信号电平监视的合适的测量电路。

公开(公告)号：US06600515B2

公开(公告)日：2003-07-29

申请号：US10046449

申请日：2001-10-22

申请人： Andrew E. Bowyer ,  Pingnan Shi

发明人： Andrew E. Bowyer ,  Pingnan Shi

IPC分类号： H04N700

CPC分类号： H04N17/00 ,  H04N7/087

摘要： A method of transmitting a leakage tagging signal includes inserting a tagging signal into a CATV television signal only during portions of the television signal in which control information is present. A method according to the present invention is a method of transmitting a tagging signal in a communication system, the communication system transmitting television signals comprising control information and program information. One step of the method includes generating a tagging signal that is detectable by corresponding leakage detecting equipment. The method also includes the step of identifying a portion of a television signal in which control information is present. Finally, the method of the present invention encompasses inserting the tagging signal into the television signal only during the portion of the television signal in which control information is present.

公开(公告)号：US06307593B1

公开(公告)日：2001-10-23

申请号：US08943652

申请日：1997-10-03

申请人： Andrew E. Bowyer ,  Pingnan Shi

发明人： Andrew E. Bowyer ,  Pingnan Shi

IPC分类号： H04N700

CPC分类号： H04N17/00 ,  H04N7/087

摘要： A method of transmitting a leakage tagging signal includes inserting a tagging signal into a CATV television signal only during portions of the television signal in which control information is present. A method according to the present invention is a method of transmitting a tagging signal in a communication system, the communication system transmitting television signals comprising control information and program information. One step of the method includes generating a tagging signal that is detectable by corresponding leakage detecting equipment. The method also includes the step of identifying a portion of a television signal in which control information is present. Finally, the method of the present invention encompasses inserting the tagging signal into the television signal only during the portion of the television signal in which control information is present.

摘要翻译： 发送泄漏标签信号的方法包括仅在存在控制信息的电视信号的部分期间将标记信号插入到CATV电视信号中。 根据本发明的方法是在通信系统中发送标记信号的方法，所述通信系统发送包括控制信息和节目信息的电视信号。 该方法的一个步骤包括产生可由相应的泄漏检测设备检测的标记信号。 该方法还包括识别其中存在控制信息的电视信号的一部分的步骤。 最后，本发明的方法包括仅在存在控制信息的电视信号的部分期间将标记信号插入电视信号。

公开(公告)号：US06313874B1

公开(公告)日：2001-11-06

申请号：US08971906

申请日：1997-11-17

申请人： Andrew E. Bowyer ,  Daniel K. Chappell

发明人： Andrew E. Bowyer ,  Daniel K. Chappell

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。

公开(公告)号：US06278485B1

公开(公告)日：2001-08-21

申请号：US08980959

申请日：1997-12-01

申请人： Douglas J. Franchville ,  Andrew E. Bowyer

发明人： Douglas J. Franchville ,  Andrew E. Bowyer

IPC分类号： H04N1700

CPC分类号： H04N17/00 ,  H04B17/309

摘要： An exemplary embodiment of the present invention is an apparatus for receiving sweep testing signals and generating frequency response values therefrom. The apparatus includes a test input, a controller, a receiver circuit and a measurement circuit. The test input has a first connection arrangement for connecting to a test output of the sweep transmitter and also has a second connection arrangement for connecting to a terminal of the communication system to be tested. The controller is operable to generate a sweep control signal responsive to a sweep plan. The receiver circuit has a control input connected to receive the sweep control signal from the controller, and is operable to tune to a plurality of frequencies responsive to the sweep control signal. The measurement circuit is coupled to the receiver circuit and is operable to generate measurement signals corresponding to the plurality of frequencies. In accordance with the present invention, the controller is further operable to: receive a first set of measurement signals from the measurement circuit when said test input is connected in the first connection arrangement; receive a second set of measurement signals from the measurement circuit when said test input is connected in the second connection arrangement; and generate a frequency response based on the first set of measurement signals and the second set of measurement signals.

摘要翻译： 本发明的示例性实施例是一种用于接收扫描测试信号并从其产生频率响应值的装置。 该装置包括测试输入，控制器，接收器电路和测量电路。 测试输入具有用于连接到扫描发射器的测试输出的第一连接装置，并且还具有用于连接到要测试的通信系统的终端的第二连接装置。 控制器可操作以响应扫描计划产生扫描控制信号。 接收器电路具有连接用于接收来自控制器的扫描控制信号的控制输入，并且可操作以响应于扫描控制信号调谐到多个频率。 测量电路耦合到接收器电路并且可操作以产生对应于多个频率的测量信号。 根据本发明，控制器还可操作用于：当所述测试输入连接在第一连接装置中时，从测量电路接收第一组测量信号; 当所述测试输入连接在第二连接装置中时，从测量电路接收第二组测量信号; 并且基于第一组测量信号和第二组测量信号产生频率响应。

公开(公告)号：US6118975A

公开(公告)日：2000-09-12

申请号：US982935

申请日：1997-12-02

申请人： Andrew E. Bowyer ,  Douglas J. Franchville

发明人： Andrew E. Bowyer ,  Douglas J. Franchville

IPC分类号： H04N7/10 ,  H04N17/00 ,  H04N7/16

CPC分类号： H04N7/102 ,  H04N17/00

摘要： An exemplary leakage tagging signal generator according to the present invention is intended for use in connection with a leakage tagging signal detector that detects signal leakage in a communication system. In particular, the leakage tagging signal generator is intended for use with a leakage tagging signal detector that identifies leakage tagging signals based on the detection of a characteristic leakage tagging frequency component. The leakage tagging signal generator includes an RF signal source, an output, a switch, and a pulse signal source. The RF signal source is operable to generate an RF carrier signal having a first frequency. The output connects to the communication system. The pulse signal source is a device operable to generate a pulse signal having a first state and a second state, said pulse signal having a pulse period. The pulse period of the pulse signal includes a first portion in which the pulse signal is in the first state and a second portion in which the pulse signal is in the second state. The pulse period futhermore corresponds to the characteristic tagging frequency. The switch is connected to the pulse signal source. The switch is operable to provide a first discrete signal level of the RF carrier signal to the output responsive to the pulse signal being in the first state, and to provide a second discrete level of the RF carrier signal to the output responsive to the pulse signal being in the second state, thereby producing a pulsed RF signal having the pulse period.

摘要翻译： 根据本发明的示例性泄漏标签信号发生器旨在用于检测通信系统中的信号泄漏的泄漏标签信号检测器。 特别地，泄漏标记信号发生器旨在与泄漏标签信号检测器一起使用，该检测器基于特征泄漏标记频率分量的检测识别泄漏标记信号。 泄漏标签信号发生器包括RF信号源，输出端，开关和脉冲信号源。 RF信号源可操作以产生具有第一频率的RF载波信号。 输出连接到通信系统。 脉冲信号源是用于产生具有第一状态和第二状态的脉冲信号的装置，所述脉冲信号具有脉冲周期。 脉冲信号的脉冲周期包括其中脉冲信号处于第一状态的第一部分和脉冲信号处于第二状态的第二部分。 脉冲周期更加对应于特征标记频率。 开关连接到脉冲信号源。 所述开关可操作以响应于所述脉冲信号处于所述第一状态而向所述输出端提供所述RF载波信号的第一离散信号电平，并且响应于所述脉冲信号向所述输出提供所述RF载波信号的第二离散电平 处于第二状态，从而产生具有脉冲周期的脉冲RF信号。