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81. 发明授权

US06233529B1 Frequency spectrum analyzer having time domain analysis function 失效
标题翻译：频谱分析仪具有时域分析功能
公开(公告)号：US06233529B1
公开(公告)日：2001-05-15
申请号：US09167621
申请日：1998-10-06
申请人： Tomoaki Nonaka
发明人： Tomoaki Nonaka
IPC分类号： G01R2300
CPC分类号： G01R23/173
摘要： A spectrum analyzer is provided with a continuous period measurement function which continuously measures time periods of each and every cycle of an IF signal to analyze changes in frequency and time period of an input signal in a time domain. The frequency spectrum analyzer having a sweep local oscillator includes a continuous period measurement block for continuously measuring each time period of an IF signal produced by mixing the input signal and the local oscillator signal, and a processor and display for processing the data representing the continuous time period produced by the continuous period measurement block to analyze the input signal in the time domain.
摘要翻译：频谱分析仪具有连续周期测量功能，连续测量IF信号的每个周期的时间周期，分析时域中输入信号的频率和时间周期的变化。具有扫描本地振荡器的频谱分析器包括用于连续测量通过混合输入信号和本地振荡器信号产生的IF信号的每个时间周期的连续周期测量块，以及用于处理表示连续时间的数据的处理器和显示器由连续周期测量块产生的时段分析时域中的输入信号。

82. 发明授权

US06233288B1 Spectrum analyzer 失效
标题翻译：频谱分析仪
公开(公告)号：US06233288B1
公开(公告)日：2001-05-15
申请号：US09070094
申请日：1998-04-03
申请人： Hiroaki Takaoku , Takayoshi Fukui
发明人： Hiroaki Takaoku , Takayoshi Fukui
IPC分类号： H04L2706
CPC分类号： G01R23/173
摘要： A spectrum analyzer having an improved local oscillator for use in a digital step sweep is capable of minimizing a dynamic spurious response which is inverse proportional to a unit step time in the step sweep. The local oscillator includes a random clock delay which provides a random clock to a direct digital synthesizer to incorporate random timings in a time length of the unit step time for sweeping the local oscillator. In another aspect, the local oscillator includes a sweep step number control which maximizes the number of steps in the step sweep to ultimately decrease the dynamic spurious response.
摘要翻译：具有用于数字步进扫描的改进的本地振荡器的频谱分析仪能够使与步进扫描中的单位步进时间成反比的动态杂散响应最小化。本地振荡器包括随机时钟延迟，其向直接数字合成器提供随机时钟，以在用于扫描本地振荡器的单位步进时间的时间长度内并入随机定时。在另一方面，本地振荡器包括扫频步数控制，其最大化阶梯扫描中的步数，以最终降低动态杂散响应。

83. 发明授权

US5736845A Spectrum analyzer having image frequency eliminating device 失效
标题翻译：具有图像频率消除装置的频谱分析仪
公开(公告)号：US5736845A
公开(公告)日：1998-04-07
申请号：US555759
申请日：1995-11-09
申请人： Takashi Kosuge
发明人： Takashi Kosuge
IPC分类号： G01R23/173 , G01R13/24
CPC分类号： G01R23/173
摘要： A frequency spectrum analyzer includes a display for showing frequency spectrums in a frequency domain versus power level form, a local oscillator which is driven by a sweep signal to repeatedly cause a frequency sweep of a local signal wherein the local oscillator and the display operate in synchronism with the sweep signal, an intermediate frequency filter whose center frequency is an intermediate frequency for transmitting intermediate frequency signals, a frequency mixer for mixing an input signal to be measured and the local signal and generating the intermediate frequency signals whose frequency is a difference of the input signal and fundamental and harmonic components of the local signal, a detector for rectifying the intermediate frequency signal from the intermediate frequency filter wherein an output of the detector shows frequency spectrums of a true frequency spectrum of the input signal and image spectrums produced by the mixer, a sweep offset control for alternately causing a frequency shift in the frequency sweep in the local signal wherein the frequency shift is equal to f.sub.if2 .times.2/N, where f.sub.if2 is the intermediate frequency and N is a harmonic number of the local signal, and an image removal processor for monitoring the output of the detector and identifying the true frequency spectrum of the input signal and the image spectrums on the basis of positional changes between the frequency sweep without the frequency shift and the frequency sweep involving the frequency shift in the local signal.
摘要翻译：频谱分析仪包括用于显示频域与功率电平形式的频谱的显示器，由扫描信号驱动以重复地使本地振荡器和显示器同步操作的本地信号的频率扫描的本地振荡器利用扫描信号，中心频率是用于发送中频信号的中频的中频滤波器，用于混合要测量的输入信号和本地信号的混频器，并产生频率为输入信号和本地信号的基波和谐波分量，用于对来自中频滤波器的中频信号进行整流的检波器，其中检波器的输出显示输入信号的真频率频谱和由混频器产生的图像频谱，用于交替起作用的扫掠偏移控制在本地信号中的频率扫描中的频移，其中频移等于fif2x2 / N，其中fif2是中间频率，N是本地信号的谐波数，以及图像去除处理器，用于监视检测器，并基于频率扫描与频率偏移之间的位置变化以及涉及局部信号中的频移的频率扫描来识别输入信号和图像频谱的真实频谱。

84. 发明授权

US5729145A Method and apparatus for detecting arcing in AC power systems by monitoring high frequency noise 失效
标题翻译：通过监测高频噪声来检测交流电力系统中的电弧的方法和装置
公开(公告)号：US5729145A
公开(公告)日：1998-03-17
申请号：US433717
申请日：1995-05-02
申请人： Frederick K. Blades
发明人： Frederick K. Blades
IPC分类号： G01R23/173 , G01R31/12 , H02H1/00 , H02H1/04 , G01R31/08 , G01R19/00
CPC分类号： G01R31/1272 , H02H1/0015 , G01R23/173 , H01H2071/006 , H02H1/04
摘要： Arcing in an AC power system is detected by monitoring the power waveform for wideband high-frequency noise, and examining the detected noise for patterns of variation in its amplitude synchronized to the power waveform. A narrowband, swept-frequency detector and synchronous averaging may be employed to improve discrimination of arc noise from background interference. An arcing fault interrupter for controlling a single circuit, and a whole house monitor, for detecting arcing anywhere in a house, are described.
摘要翻译：通过监控宽带高频噪声的功率波形来检测交流电源系统中的电弧，并检测检测到的噪声与其功率波形同步的振幅变化模式。可以采用窄带，扫频检测器和同步平均来改善电弧噪声与背景干扰的区分。描述了用于控制单个电路的电弧故障中断器和用于在房屋中的任何地方检测电弧放电的整体监视器。

85. 发明授权

US5543779A EMI source detector 失效
标题翻译： EMI源检测器
公开(公告)号：US5543779A
公开(公告)日：1996-08-06
申请号：US401118
申请日：1995-03-09
申请人： Marc S. Aspesi , Steven T. Nakata
发明人： Marc S. Aspesi , Steven T. Nakata
IPC分类号： G01R23/173 , G01R29/08 , G08B1/08
CPC分类号： G01R29/0814 , G01R23/173 , G01R29/0871
摘要： A scanning radio receiver for indicating the presence of operating consumer electronics by detecting the electromagnetic radiation at each scanned frequency is disclosed. The detected field strength at the antenna at each scanned frequency is compared to a first threshold of 20 .mu.v/m from 400 KHz to 88 MHz, 30 .mu.v/m from 88+ MHz to 216 MHz, and 40 .mu.v/m from 216+ MHz to 918 MHz and a first alarm is sounded should the detected field strength exceed this first threshold. The detected field strength at the antenna at each scanned frequency is also compared to a second threshold of 1 mv/m and a second alarm, distinct from the first is sounded should the detected field strength exceed this second threshold. This device is useful for detecting the unauthorized operation of electronic equipment in the vicinity of mission critical or life support electronics which may be susceptible to consumer electronics generated EMI.
摘要翻译：公开了一种扫描无线电接收机，用于通过检测每个扫描频率的电磁辐射来指示存在操作的消费者电子设备。将每个扫描频率处的天线处的检测到的场强与从400KHz到88MHz的20μv/ m的第一阈值进行比较，从88MHz到216MHz的30μV/ m，和从40MHz到/ 如果检测到的场强超过该第一阈值，则会发出第一个警报。如果检测到的场强超过该第二阈值，则将每个扫描频率处的天线处的检测到的场强也与1mv / m的第二阈值进行比较，并且与第一警报不同的第二警报响起。该设备可用于检测可能易受消费电子产生的EMI影响的关键任务或生命支持电子设备附近的电子设备的未经授权的操作。

86. 发明授权

US5519820A Waveform display apparatus for easily realizing high-definition waveform observation 失效
标题翻译：波形显示装置，用于轻松实现高清晰度波形观察
公开(公告)号：US5519820A
公开(公告)日：1996-05-21
申请号：US385555
申请日：1995-02-08
申请人： Takehiko Kawauchi , Yoshifumi Imazu , Katsuhiko Kamiyama , Mitsuyoshi Takano , Katsuhisa Iiyoshi , Takahiro Wada , Aiichi Katayama
发明人： Takehiko Kawauchi , Yoshifumi Imazu , Katsuhiko Kamiyama , Mitsuyoshi Takano , Katsuhisa Iiyoshi , Takahiro Wada , Aiichi Katayama
IPC分类号： G01R13/34 , G01R23/16 , G01R23/163 , G01R23/173 , G01R27/32 , G06T3/00
CPC分类号： G01R23/163 , G01R13/345 , G01R23/16 , G01R23/173 , G01R27/32 , Y10S715/97
摘要： A measurement unit U100 measures an input signal to be measured by sweeping frequencies in a measurement range having a predetermined frequency band so as to obtain waveform data to be developed on the frequency axis such as spectrum data in, e.g., a spectrum analyzer. The waveform data obtained by the measurement of the measurement unit U100 is displayed by a display device 500 via a display data processor U20 included in a control unit U200 to be described later to be developed on the frequency axis of the display device, i.e., in correspondence with the measurement frequencies. The control unit U200 includes a measurement controller U30 for controlling the measurement unit U100 so as to display waveform data obtained by enlarging or reducing waveform data, before a measurement frequency condition is changed, at a predetermined magnification to have a predetermined point on the frequency axis as the center on the basis of a change in measurement frequency condition set by a condition setting unit U900, and an enlargement display/stable display processor U40 for controlling the display data processor U20. The enlargement display/stable display processor U40 realizes high-definition waveform observation as the gist of this invention, and substantially has a function of controlling the display device U500 as the control unit U200.
摘要翻译：测量单元U100通过在具有预定频带的测量范围内的频率扫描来测量要测量的输入信号，以获得在频率轴上显影的波形数据，例如频谱分析仪中的频谱数据。通过测量单元U100的测量获得的波形数据由显示装置500经由包括在稍后描述的控制单元U200中的显示数据处理器U20显示在显示装置的频率轴上，即在与测量频率的对应关系。控制单元U200包括用于控制测量单元U100的测量控制器U30，以便以预定的倍率显示在测量频率条件改变之前通过放大或缩小波形数据而获得的波形数据，以在频率轴上具有预定点作为基于由条件设置单元U900设置的测量频率条件的改变的中心，以及用于控制显示数据处理器U20的放大显示/稳定显示处理器U40。放大显示/稳定显示处理器U40实现高清晰度波形观察作为本发明的要点，并且基本上具有控制显示装置U500作为控制单元U200的功能。

87. 发明授权

US5117179A Swept signal analysis instrument and method 失效
标题翻译： SWEPT信号分析仪器和方法
公开(公告)号：US5117179A
公开(公告)日：1992-05-26
申请号：US493590
申请日：1990-03-13
申请人： Jay M. Wardle , Ronald W. Potter , John A. Gibbs
发明人： Jay M. Wardle , Ronald W. Potter , John A. Gibbs
IPC分类号： G01R23/14 , G01R23/173 , G01R27/28 , G01R27/30
CPC分类号： G01R27/30 , G01R23/14 , G01R23/173
摘要： The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.

88. 发明授权

US4801873A Waveform measuring apparatus with marker zone displaying function 失效
标题翻译：具有标记区显示功能的波形测量装置
公开(公告)号：US4801873A
公开(公告)日：1989-01-31
申请号：US163020
申请日：1988-03-02
申请人： Mitsuyoshi Takano
发明人： Mitsuyoshi Takano
IPC分类号： G01R23/16 , G01D1/12 , G01R13/20 , G01R13/30 , G01R23/173 , G01R23/18
CPC分类号： G01R23/18 , G01R23/173
摘要： An input section outputs a digital signal representing a characteristic value corresponding to a measurement range of an input signal. The digital signal is then stored in a memory. A display displays the digital signal stored in the memory as an image which is developed along one of two-dimensional coordinates axes and represents the predetermined characteristic value. A zone setting section outputs zone width data for setting, as a marker zone, a portion including a desired range of the one axis for the image displayed on the display. A zone display controller causes the display to display the marker zone, in accordance with the zone width data. A detector reads out the digital signal within the desired range of the one axis, from the memory, in accordance with the zone width data, and detects the specific characteristic value in the readout digital signal. A display controller causes a display to display detected specific characteristic value data.

89. 发明授权

US4720673A Spectrum analyzer and logarithmic amplifier therefor 失效
标题翻译：频谱分析仪及其对数放大器
公开(公告)号：US4720673A
公开(公告)日：1988-01-19
申请号：US734115
申请日：1985-05-15
申请人： R. Andrew Hatfield
发明人： R. Andrew Hatfield
IPC分类号： G01R15/00 , G01R23/173 , G01R23/16
CPC分类号： G01R23/173 , G01R15/005
摘要： The spectrum analyzer comprises an input for receiving electromagnetic signals in a predetermined first frequency band and an image reject mixer for reducing the power of images of the received signals while down-converting the signals to an intermediate frequency. The image reject mixer reduces the signal power level to approximately that of the background noise of the signal. The mixer is swept through a predetermined frequency band in order to down-convert each frequency in the received signal band individually. The down-converted signals are logarithmically compressed using a multi-stage logarithmic compression circuit having variable gain amplifiers in each stage.
摘要翻译：频谱分析仪包括用于在预定的第一频带中接收电磁信号的输入端和用于在将信号下变频到中频的同时降低接收信号的图像功率的图像抑制混频器。图像抑制混频器将信号功率电平降低到信号背景噪声的近似值。混频器扫过预定的频带，以分别对接收信号频带中的每个频率进行下变频。下变频信号在每级具有可变增益放大器的多级对数压缩电路对数压缩。

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