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61. 发明授权

US07129757B2 Clock frequency detect with programmable jitter tolerance 失效
公开(公告)号：US07129757B2
公开(公告)日：2006-10-31
申请号：US11000439
申请日：2004-11-30
申请人： Charles Porter Geer , Robert Allen Shearer
发明人： Charles Porter Geer , Robert Allen Shearer
IPC分类号： G01R25/00
CPC分类号： G01R23/005 , H03D13/00
摘要： An apparatus and method is disclosed for programmable determination of frequency, phase, and jitter relationship of a first clock and a second clock in an electronic system. In a first, initialization, mode, a first register and a second register are initialized with a first bit pattern and a second bit pattern, respectively. In a second, normal, mode, the first clock is coupled to the first register and the second clock is coupled to the second register. A compare unit observes the bit patterns of the first and second registers and reports when one or more predetermined relationships between the first clock and the second clock occur.

62. 发明授权

US06879187B2 Signal detect circuit for high speed data receivers 失效
标题翻译：用于高速数据接收机的信号检测电路
公开(公告)号：US06879187B2
公开(公告)日：2005-04-12
申请号：US10609802
申请日：2003-06-30
申请人： Robert X. Jin , Kathy L. Peng , Stephen F. Dreyer
发明人： Robert X. Jin , Kathy L. Peng , Stephen F. Dreyer
IPC分类号： G01R23/00 , H03K5/08 , H03K5/153 , H03K5/26 , H03K5/22
CPC分类号： G01R23/005 , H03K5/08 , H03K5/153 , H03K5/26
摘要： In accordance with one embodiment of the present invention, a signal detect circuit may analyze an input signal before passing it on to a receiver. The analysis may be done outside of the data path to avoid affecting the data path speed or adding distortion or jitter. The positive and negative thresholds of the data may be checked to see if the numbers of positive and negative crossings are comparable. Random and bursty noise can be detected since such noise normally does not have comparable positive and negative crossings.
摘要翻译：根据本发明的一个实施例，信号检测电路可以在输入信号传送到接收器之前分析输入信号。分析可以在数据路径之外进行，以避免影响数据路径速度或增加失真或抖动。可以检查数据的正和负阈值以查看正和负交叉的数量是否可比。可以检测到随机和突发噪声，因为这种噪声通常不具有可比的正负交叉。

63. 发明授权

US06614271B1 Signal detect circuit for high speed data receivers 失效
标题翻译：用于高速数据接收机的信号检测电路
公开(公告)号：US06614271B1
公开(公告)日：2003-09-02
申请号：US10171071
申请日：2002-06-13
申请人： Robert X. Jin , Kathy L. Peng , Stephen F. Dreyer
发明人： Robert X. Jin , Kathy L. Peng , Stephen F. Dreyer
IPC分类号： H03K5153
CPC分类号： G01R23/005 , H03K5/08 , H03K5/153 , H03K5/26
摘要： In accordance with one embodiment of the present invention, a signal detect circuit may analyze an input signal before passing it on to a receiver. The analysis may be done outside of the data path to avoid affecting the data path speed or adding distortion or jitter. The positive and negative thresholds of the data may be checked to see if the numbers of positive and negative crossings are comparable. Random and bursty noise can be detected since such noise normally does not have comparable positive and negative crossings.
摘要翻译：根据本发明的一个实施例，信号检测电路可以在输入信号传送到接收器之前分析输入信号。分析可以在数据路径之外进行，以避免影响数据路径速度或增加失真或抖动。可以检查数据的正和负阈值以查看正和负交叉的数量是否可比。可以检测到随机和突发噪声，因为这种噪声通常不具有可比的正负交叉。

64. 发明授权

US5483201A Synchronization circuit using a high speed digital slip counter 失效
标题翻译：同步电路采用高速数字打滑计数器
公开(公告)号：US5483201A
公开(公告)日：1996-01-09
申请号：US129537
申请日：1993-09-30
申请人： James R. Bortolini
发明人： James R. Bortolini
IPC分类号： G06F1/12 , G01R23/00 , G06F1/04 , G06F1/08 , H03D13/00 , H03L7/00 , H03L7/06 , H03L7/085 , H04L7/033 , H04Q11/04
CPC分类号： H03L7/085 , G01R23/005 , H03D13/001
摘要： Simplifying measurement equipment so that any two frequency sources can be accurately and quantitatively compared to each other. With this simplified measurement equipment, calibration can be performed on an oscillator using an external reference signal, while the oscillator is being used in an active system. By simplifying the measurement equipment, the equipment can be built into a time base unit allowing recalibration to be performed at relatively short time intervals. A frequency difference detector based on ring counters and an existing controller in a telecommunication switching system compare an accurate external reference against an oscillator of the time base unit for calibration in the field. Within the telecommunication switching system, a highly accurate external reference signal is normally available from an interconnected telecommunication network. The use of ring counters in the frequency difference detector allows for simple measurement equipment which adds little to the cost of the time base unit. Further, since measurement equipment is all digital, no tuning of the equipment is necessary as is required of measurement equipment having analog components.
摘要翻译：简化测量设备，使任何两个频率源可以准确和定量地相互比较。使用这种简化的测量设备，可以在使用外部参考信号的振荡器上进行校准，同时振荡器在有源系统中使用。通过简化测量设备，设备可以内置在时基中，允许在相对较短的时间间隔内进行重新校准。基于环形计数器和电信交换系统中的现有控制器的频差检测器将准确的外部参考与用于现场校准的时基单元的振荡器进行比较。在电信交换系统内，通常可以从互连电信网络获得高度精确的外部参考信号。在频差检测器中使用环形计数器允许简单的测量设备，这增加了时基单元的成本。此外，由于测量设备都是数字式的，所以不需要对具有模拟部件的测量设备进行调谐。

65. 发明授权

US5367266A Frequency discriminator of horizontal synchronizing signal for multi-mode monitor 失效
标题翻译：多模监视器水平同步信号鉴频器
公开(公告)号：US5367266A
公开(公告)日：1994-11-22
申请号：US991862
申请日：1992-12-15
申请人： Keehyun Kang
发明人： Keehyun Kang
IPC分类号： G01R23/00 , H03L7/087 , H04N5/12 , H04N5/46 , H03L7/00 , H03K9/06
CPC分类号： H03L7/087 , G01R23/005 , H04N5/126 , H04N5/46
摘要： A frequency discriminator of the horizontal synchronizing signal for a multi-mode monitor has a plurality of filter capacitors connected to horizontal synchronizing signal lines for rejecting noises of a direct current component of the horizontal synchronizing signal. The frequency discriminator also includes a plurality of phase comparator means respectively connected to the filter capacitors for comparing local oscillating frequencies set differently according to each mode with the inputted horizontal synchronizing signal to output one signal representative of the mode of the monitor.
摘要翻译：用于多模式监视器的水平同步信号的鉴频器具有连接到水平同步信号线的多个滤波电容器，用于抑制水平同步信号的直流分量的噪声。鉴频器还包括分别连接到滤波电容器的多个相位比较器装置，用于将根据每个模式不同地设置的本地振荡频率与输入的水平同步信号进行比较，以输出表示监视器模式的一个信号。

66. 发明授权

US4859933A Narrowband signal recognition for EMI measurement 失效
标题翻译：用于EMI测量的窄带信号识别
公开(公告)号：US4859933A
公开(公告)日：1989-08-22
申请号：US211517
申请日：1988-06-24
申请人： John B. Taylor , Michael K. Ellis
发明人： John B. Taylor , Michael K. Ellis
IPC分类号： G01R23/00 , G01R23/167 , G01R31/00
CPC分类号： G01R23/167 , G01R23/005 , G01R31/001
摘要： A test method and apparatus to aid a site operator in discriminating between signals measured at different times, as well as enabling a level of automation which is appropriate using state-of-the-art instrumentation for performing EMI measurements, such as open-site EMI measurements. Preferably, discrimination between the two signals is based on the two signals being separated by at least a frequency E defined as:E=2(frequency span/N)+K * RBWwhere:E=possible frequency error of a signal; frequency span=frequency range swept by a measuring receiver, for example, a spectrum analyzer;N=number of points measured;RBW=resolution bandwidth of a resolving bandpass filter of the measuring receiver; andK=constant less than or equal to one to account for unknown signal characteristics.With the specific application to open-site EMI measurements, preferably signals are allowed to be falsely detected as separate signals in order to take into account unknown signal characteristics, i.e., 1 RBW.fwdarw.K * RBW.
摘要翻译：一种测试方法和设备，用于帮助现场操作员区分在不同时间测量的信号，以及实现适合使用最先进的仪器进行EMI测量的自动化程度，例如开放场所EMI 测量。优选地，两个信号之间的区别基于两个信号被至少被定义为E = 2（频率跨度/ N）+ K * RBW的频率E分开，其中：E =信号的可能的频率误差; 频率跨度=由测量接收机扫描的频率范围，例如频谱分析仪; N =测量点数; RBW =测量接收机的分辨率带通滤波器的分辨率带宽; 并且K =常数小于或等于1以考虑未知信号特性。通过具体应用于开放式EMI测量，优选信号被错误地检测为单独的信号，以便考虑未知信号特性，即1 RBW→K * RBW。

67. 发明授权

US4634955A Malfunction detector for detecting open-circuit condition at DC generator output terminal 失效
标题翻译：用于检测直流发电机输出端子的开路状态的故障检测器
公开(公告)号：US4634955A
公开(公告)日：1987-01-06
申请号：US659476
申请日：1984-10-10
申请人： Hifumi Wada
发明人： Hifumi Wada
IPC分类号： H02H7/06 , G01R23/00 , G01R31/00 , H02J7/14 , H02J7/16 , H02P9/04 , H02P9/00
CPC分类号： H02J7/166 , G01R23/005 , G01R31/007
摘要： A malfunction detector for detecting an open-circuit condition at the output terminal of a vehicular DC generator is disclosed. The frequency of a signal derived from one of the armature windings of the generator, for instance, at an end or neutral terminal, is compared with the control frequency of the voltage regulator, which may be derived from a field winding of the generator. If the latter is equal to the former, an indication of an open-circuit condition is given.
摘要翻译：公开了一种用于检测车辆直流发电机的输出端的开路状态的故障检测器。将来自发电机的一个电枢绕组（例如，端部或中性端子）的信号的频率与可以从发电机的励磁绕组导出的电压调节器的控制频率进行比较。如果后者等于前者，则给出开路条件的指示。

68. 发明授权

US4599580A Circuit for comparing two or more frequencies 失效
标题翻译：用于比较两个或更多个频率的电路
公开(公告)号：US4599580A
公开(公告)日：1986-07-08
申请号：US672478
申请日：1984-11-16
申请人： Akira Yamaguchi , Hiroshi Shigehara , Hidemi Iseki
发明人： Akira Yamaguchi , Hiroshi Shigehara , Hidemi Iseki
IPC分类号： G01R23/00 , G10L19/02 , H03K3/0231 , H03K4/02 , H03L7/08
CPC分类号： H03K4/023 , G01R23/005 , G10L19/02 , H03K3/0231
摘要： According to a frequency comparing circuit of the present invention, there is provided a negative switched capacitor circuit having negative equivalent resistance, the value of which is determined according to the reference frequency and the frequency to be compared, and a positive switched capacitor circuit having positive equivalent resistance, the value of which is determined according to the reference frequency. A constant DC voltage is supplied in parallel to one terminal of the two switched capacitor circuits. The respective terminals of the switched capacitor circuits are commonly connected in order to produce the composite current of both output currents of the two switched capacitor circuits. The composite current is integrated by an integrator. Further, there is provided a Schmitt-type oscillating circuit. The oscillating frequency signal from the Schmitt-type oscillating circuit is supplied to the negative switched capacitor circuit. The higher level threshold voltage of the Schmitt-type oscillating circuit is determined according to the composite current of both output currents of the two switched capacitor circuits, thereby adjusting the frequency of the oscillating signal of the Schmitt-type oscillating circuit. The oscillating signal is supplied to the positive switched capacitor circuit. The lower level threshold voltage of the Schmitt-type oscillating circuit is determined according to the composite current of both output currents of the two switched capacitor circuits. Therefore, the frequency of the oscillating signal of the Schmitt-type oscillating circuit is adjusted.

69. 发明授权

US4321547A Electronic discrimination circuitry for the highest frequency of a plurality of input signals 失效
标题翻译：用于多个输入信号的最高频率的电子鉴别电路
公开(公告)号：US4321547A
公开(公告)日：1982-03-23
申请号：US105132
申请日：1979-12-19
申请人： Gordon W. Pickard , Ian Hayward
发明人： Gordon W. Pickard , Ian Hayward
IPC分类号： G01P3/54 , G01R23/00 , H03K5/26
CPC分类号： G01R23/005 , G01P3/54 , H03K5/26
摘要： In electronic discrimination circuitry each of a plurality of at least three analog input signals is converted to respective digital pulse output signals and to a number of multi-phase clocking signals equal in number to the plurality of input signals are also generated such that each of the plurality of at least three analog input signals is synchronized in response to a respective one of the multi-phase clocking signals, whereby at least the leading edge of each of the digital output signals is positioned into a time slot corresponding to the multi-phase clocking signals. Selected pairs of the synchronized digital output signals are sequentially compared to determine within each compared pair that digital output signal having a higher frequency and comparing that digital output signal with another digital output signal until the digital output signal having the highest frequency is selected.
摘要翻译：在电子鉴别电路中，多个至少三个模拟输入信号中的每一个被转换为相应的数字脉冲输出信号，并且还生成与多个输入信号相等数量的多个多相时钟信号，使得多个至少三个模拟输入信号响应于多相时钟信号中的相应时钟信号同步，由此至少每个数字输出信号的前沿位于对应于多相时钟的时隙信号。顺序地比较所选择的同步数字输出信号对，以确定每个比较对中的数字输出信号具有较高的频率，并将该数字输出信号与另一数字输出信号进行比较，直到选择具有最高频率的数字输出信号为止。

70. 发明授权

US4215280A Phase responsive frequency detector 失效
标题翻译：相位响应频率检测器
公开(公告)号：US4215280A
公开(公告)日：1980-07-29
申请号：US939048
申请日：1978-09-01
申请人： Joseph Mahig
发明人： Joseph Mahig
IPC分类号： G01R23/00 , G01R23/175 , H03K1/16 , H03K3/72
CPC分类号： G01R23/175 , G01R23/005
摘要： A detector for detecting the presence of selected frequency components of an input signal and operative to deliver output responsive thereto by providing two separate signal paths in the detector, at least one path including filter circuitry having a distinct cross-over point operative to pass frequencies on one side of the cross-over point with one phase relative to the input and to pass frequencies on the other side of the cross-over point substantially 180.degree. out of phase relative to the input, and the detector further including a coincidence circuit receiving the signals from the two paths and generating one level of output for signals which are substantially in phase and generating another lower level of output for signals substantially out of phase. The coincidence circuit may have provisions for establishing an input threshold level which the signals must overcome.
摘要翻译：一种检测器，用于检测输入信号的选定频率分量的存在并且通过在检测器中提供两个分离的信号路径来操作以对其输出输出，至少一个路径包括具有不同交叉点的滤波器电路，所述交叉点的一侧具有相对于所述输入的一个相位，并且使所述交叉点的另一侧上的频率相对于所述输入基本上相差180度，并且所述检测器还包括接收来自两条路径的信号，并为基本上同相的信号产生一个输出电平，并为基本上异相的信号产生另一较低输出电平。符合电路可以具有用于建立信号必须克服的输入阈值电平的规定。

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