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公开(公告)号：US4002971A
公开(公告)日：1977-01-11
申请号：US652446
申请日：1976-01-26
摘要： A wide operating frequency range transmission line discriminator uses an imum length transmission line which permits near carrier frequency modulation to be measured on a carrier frequency in a broad range from approximately two megahertz to one gigahertz. A hybrid junction, balanced phase detector, power dividers, attenuators and a variable transmission line coupled with the optimum length transmission line provide a wide frequency range discriminator with only a minimum exchange in selected components being necessary for changes in carrier frequency. This near carrier analyzer operates over the wide frequency range with the only component changes being an input bandpass filter, the optimum length transmission line, and the variable length transmission line used as a variable or adjustable phase shift device. The transmission line sections are easily changed by simply selecting proper line lengths which may be previously established. When optimum detection is not essential in a particular measurement, the optimum length transmission line can effectively operate and accomplish its function over several octaves of frequency range with minimal analyzer degradation, on the order of three decibels. In measuring frequency modulation noise, carrier nulling in excess of 60 decibels is accomplished. After this carrier null has been accomplished, the discriminator circuit rejects incidental amplitude modulation on the test signal, and is not restricted by burnout power ratings of crystals within the phase detector.
摘要翻译： 宽工作频率范围传输线鉴别器使用最佳长度传输线，其允许在载波频率上从大约2兆赫到1千兆赫的宽范围内测量近载波调制。 混合结，平衡相位检测器，功率分配器，衰减器和与最佳长度传输线耦合的可变传输线提供宽频率范围鉴别器，在选择的分量中只需要对载波频率变化所需的最小交换。 这种近载波分析仪在宽频率范围内工作，其中唯一的分量变化是用作可变或可调相移装置的输入带通滤波器，最佳长度传输线和可变长度传输线。 通过简单地选择可以预先建立的适当的线路长度来容易地改变传输线路段。 当最佳检测在特定测量中不是必需的时，最佳长度传输线可以有效地操作，并且在三分贝数量级的最小分析仪退化的频率范围的几个八度的范围内实现其功能。 在测量频率调制噪声中，完成了超过60分贝的载波零位。 在该载波空值已经完成之后，鉴频器电路拒绝对测试信号的附带的幅度调制，并且不受相位检测器内的晶体的烧坏功率额定值的限制。
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42.发明授权Tracking filter for frequency measurement in a Doppler type navigation guidance system or the like 失效用于多普勒型导航系统等中的频率测量的跟踪滤波器
公开(公告)号：US3977002A
公开(公告)日：1976-08-24
申请号：US547598
申请日：1975-02-06
申请人： Paul Barton
发明人： Paul Barton
摘要： A Doppler type radio navigation system in which each element of a linear array is energized discretely and sequentially to produce a simulated Doppler effect at a remote location such as an aircraft on landing approach. A reference signal is also transmitted, and a receiver at the remote location "sees" a Doppler frequency shift proportional to the sine of the angle subtended by the receiver normal to the axis of the array by processing of the commutated data against the received reference signal to obtain a beat. A sum and difference transversal tracking filter arrangement is included for tracking the desired beat signal to exclude multi-path spurious beat signals. The tracking arrangement includes a voltage controlled oscillator, the detected beat signal being taken therefrom. Low noise bandwidth is obtained and performance under severe multipath conditions is improved.
摘要翻译： 一种多普勒型无线电导航系统，其中线性阵列的每个元件被离散地和顺序地通电，以在诸如着陆方法的飞机的远程位置处产生模拟多普勒效应。 参考信号也被发送，并且远程位置处的接收机通过根据接收到的参考信号处理换向数据来“看到”与由阵列的垂直方向垂直的接收器的角度的正弦成比例的多普勒频移 获得节拍。 包括和差和横向跟踪滤波器装置，用于跟踪期望的节拍信号以排除多径杂散节拍信号。 跟踪装置包括压控振荡器，从中取出检测到的拍频信号。 获得低噪声带宽，改善在恶劣条件下的性能。
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43.发明授权Spectrum analyzer establishing a nonlinear frequency distribution of power-density spectra 失效频谱分析仪建立功率密度谱的非线性频率分布
公开(公告)号：US3932737A
公开(公告)日：1976-01-13
申请号：US412786
申请日：1973-11-05
申请人： Pierre Delepine
发明人： Pierre Delepine
摘要： Precalculated samples of a power-density spectrum, taken at equispaced frequencies, are converted into modified samples with a nonlinear (e.g. logarithmic) distribution by being selectively weighted with the aid of several groups of coefficients defining a series of overlapping windows of mutually different widths. The system determines the weighting coefficient whose position in the frequency band of any window is closest to that of a precalculated sample appearing within that window; for each window, any sample appearing therein is multiplied by its closest coefficient and the sum of the resulting products is then divided by a factor proportional to the width of the window.
摘要翻译： 以等间隔频率拍摄的功率密度谱的预先计算的样本通过借助于限定相互不同宽度的一系列重叠窗口的几组系数被选择性地加权而被转换成具有非线性（例如对数）分布的经修改的样本。 该系统确定任何窗口的频带中的位置最接近出现在该窗口内的预先计算的样本的加权系数; 对于每个窗口，其中出现的任何样本乘以其最接近的系数，然后将得到的乘积的和除以与窗口的宽度成比例的因子。
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44.发明授权Fully digital spectrum analyzer using time compression and discrete fourier transform techniques 失效全数字频谱分析仪采用时间压缩和离散傅里叶变换技术
公开(公告)号：US3881097A
公开(公告)日：1975-04-29
申请号：US36009873
申请日：1973-05-14
发明人： LEHMANN JOSEPH L , LYNCH FRANK
CPC分类号： G06F17/141 , G01R23/00
摘要： A fully digital spectrum analyzer accepting as an input either an analog signal or a series of digital numbers and using time compression and DFT (Discrete Fourier Transform) techniques to provide the spectral component values of the input signal. Novel techniques and means are used in obtaining the power values for selected spectral lines and in averaging these power values. Statistically controlled noise is added to the input of the spectrum analyzer to enhance its resolutin beyond the resolution which would be otherwise available. Advanced and efficient techniques are used for generating and applying trigonometric functions in the course of finding the real and imaginary part of Fourier transforms, and for providing running averages of the power spectra.
摘要翻译： 全数字频谱分析仪接收模拟信号或一系列数字数字的输入，并使用时间压缩和DFT（离散傅里叶变换）技术提供输入信号的频谱分量值。 在获得所选光谱线的功率值和平均这些功率值时使用新的技术和手段。 将统计控制的噪声添加到频谱分析仪的输入端，以增强其解析度，超出分辨率，否则可用。 在找到傅里叶变换的实部和虚部的过程中，使用高级和高效的技术来产生和应用三角函数，并提供功率谱的运行平均值。
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公开(公告)号：US3876936A
公开(公告)日：1975-04-08
申请号：US39802773
申请日：1973-09-17
申请人： MOTOROLA INC
发明人： LESTER THEODORE V , RYON DONALD C
摘要： A system for determining the frequency relationship between two notes of a musical instrument includes a split screen display device, and bar generating means connected to the instrument and display device for generating a first plurality of bars representative of the frequency of the first note on one portion of the display device and a second plurality of bars representative of the frequency of the second note on another portion of the display device. The vertical sweep circuit of the display device is synchronized to the frequency of one of the notes.
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公开(公告)号：US3831088A
公开(公告)日：1974-08-20
申请号：US38477573
申请日：1973-08-01
申请人： US NAVY
CPC分类号： G01R23/00
摘要： Apparatus for measuring the spectral purity of a low duty cycle pulsed signal. A continuous wave (CW) reference signal is mixed with the pulsed signal forming an IF signal that is applied to one input of a phase detector. The output of the phase detector is amplified and applied to a sample and hold circuit which compresses the pulse spectrum of the pulse signal under test. After a time delay the sample and hold circuit provides an output to a voltage controlled oscillator which supplies a variable frequency CW signal to a second input of the phase detector to complete a phase locked loop allowing FM sideband detection. The sample and hold circuit output is passed, for example, to wave analyzers or through a threshold detector arranged to drive an indicator.
摘要翻译： 用于测量低占空比脉冲信号的光谱纯度的装置。 连续波（CW）参考信号与形成施加到相位检测器的一个输入端的IF信号的脉冲信号混合。 相位检测器的输出被放大并施加到采样和保持电路，其压缩被测脉冲信号的脉冲频谱。 在延时之后，采样和保持电路向压控振荡器提供输出，该压控振荡器向相位检测器的第二输入端提供可变频率CW信号，以完成允许FM边带检测的锁相环。 采样和保持电路输出例如通过波分析器或通过布置成驱动指示器的阈值检测器。
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公开(公告)号：US3828169A
公开(公告)日：1974-08-06
申请号：US41013473
申请日：1973-10-26
发明人： FLUET F
摘要： Apparatus for digital frequency multiplication having a first AND logic gate adapted to receive an input pulse train having a frequency fin, each pulse width defining one iteration. A numerator shift register with digital contents N, is connected to the input of the first AND logic gate, the latter gate, when enabled by the signal fin, having the digital output N. A denominator shift register, having digital contents D is connected to the input of a second AND logic gate. An accumulator register coupled to the outputs of both AND gates, having digital contents R, is applied to a comparator, which compares the contents R with a datum level. The comparator delivers an output signal fo when R
摘要翻译： 用于数字倍频的装置，具有适于接收具有频率fin的输入脉冲串的第一AND逻辑门，每个脉冲宽度限定一次迭代。 具有数字内容N的分子移位寄存器连接到具有数字输出N的第一AND逻辑门的输入端，后门通过信号fin使能。具有数字内容D的分母移位寄存器连接到 第二个AND逻辑门的输入。 耦合到具有数字内容R的两个AND门的输出的累加器寄存器被施加到将内容R与基准电平进行比较的比较器。 当R <基准电平时，比较器输出一个输出信号fo，并且向第二个与逻辑门输出一个使能信号，然后该逻辑门具有输出D，累加器寄存器的内容变为：Rn + 1 = Rn-N + D，其中Rn =第n次迭代的累加器寄存器的内容，其中n> / = 0,1,2,3。 。 。
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48.发明授权
公开(公告)号：US3808370A
公开(公告)日：1974-04-30
申请号：US27906472
申请日：1972-08-09
发明人： JACKSON L , BERTRAND J
IPC分类号： H03H11/04 , G01R23/00 , G01R23/16 , G10L11/06 , G10L19/02 , H03H17/06 , H03H21/00 , G10L1/02
CPC分类号： H03H21/0012 , G01R23/00 , G10L19/02 , G10L25/93 , H03H17/06
摘要： An adaptive filter system for determining characteristics of an electrical input signal, such as resonant frequencies, antiresonant frequencies, etc. which includes a plurality of antiresonance circuits and/or resonance circuits coupled to an input signal, means for developing indicator signals indicate the deviation of the anti-resonant and/or resonant frequencies of the circuits from the anti-resonant and/or resonant frequencies of the input signal, and means for cross-correlating the output from at least one of the circuits with the indicator signals, and for generating correction signals as a function of the crosscorrelation. The correction signals are fed to the circuits to vary the anti-resonant and/or resonant frequencies thereof so that the frequencies correspond to the respective resonant and/or anti-resonant frequencies in the input signal.
摘要翻译： 一种用于确定诸如谐振频率，反谐振频率等的电输入信号的特性的自适应滤波器系统，其包括耦合到输入信号的多个反谐振电路和/或谐振电路，用于开发指示符信号的装置 指示电路的反谐振和/或谐振频率与输入信号的反谐振和/或谐振频率的偏差，以及用于将来自至少一个电路的输出与指示符信号互相关的装置 并且用于产生作为互相关函数的校正信号。 校正信号被馈送到电路以改变其反谐振和/或谐振频率，使得频率对应于输入信号中的相应谐振和/或反谐振频率。
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公开(公告)号：US3792351A
公开(公告)日：1974-02-12
申请号：US3792351D
申请日：1972-03-10
申请人： IRELAND F
发明人： IRELAND F
摘要： An absorption frequency meter having a high-Q circuit comprising a resonant circuit having variably adjustable concentric capacitive plates, electrically in series with an inductance means and an indicating means, said capacitive plates providing electromagnetic shielding for said inductance means.
摘要翻译： 一种具有高Q电路的吸收频率计，包括具有与电感装置串联的可变可调同心电容板的谐振电路和指示装置，所述电容板为所述电感装置提供电磁屏蔽。
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公开(公告)号：US3775681A
公开(公告)日：1973-11-27
申请号：US3775681D
申请日：1972-07-14
申请人： KONRAD L
发明人： KONRAD L
CPC分类号： G01R23/00
摘要： A frequency measuring means comprising a network having input means for receiving a signal which is to have its frequency measured and output means delivering signals transmitted therethrough, said network providing a signal transfer characteristic which is a function of frequency for the range of frequencies to be measured, first means deriving signals reflected from the input means of said network, second means deriving from the output means signals transmitted by said network, and third means receiving and comparing signals from said first and second means for providing an indication of the frequency of a signal delivered to the input of the network.
摘要翻译： 一种频率测量装置，包括一个具有输入装置的输入装置的接收装置，该信号具有测量和输出其频率的信号，意味着传送通过其传输的信号，所述网络提供信号传递特性，该信号传输特性是待测频率范围的频率的函数 ，第一装置导出从所述网络的输入装置反射的信号，从输出装置导出的第二装置，由所述网络发送的信号;以及第三装置，用于接收和比较来自所述第一和第二装置的信号，以提供信号频率的指示 传递到网络的输入。
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