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公开(公告)号：US4928251A
公开(公告)日：1990-05-22
申请号：US43070
申请日：1987-04-27
摘要： Representations of signal edges of a repetitive signal are sampled without triggering, then sorted out based on frequency and sequence and then superimposed along a common time base of one period in order to reconstruct a signal. In a specific embodiment of a method according to the invention, a string of samples of a repetitive, input signal with high frequency components is captured without triggering with relatively low time resolution to determine an approximate waveform from the low resolution samples, then digital signal processing techniques in the form of a fast Fourier transform are applied to a reconstructed time record of the input signal to obtain an accurate frequency for each signal component, and finally the sampled waveform is reconstructed by overlaying sampled components with reference to a common time or phase reference. The FFT is employed to determine the frequency of each signal component very accurately. Further processing, such as bin interpolation based on a window function, may be employed to improve resolution still further.
摘要翻译： 重复信号的信号边缘的表示被采样而不触发，然后根据频率和序列进行排序，然后沿着一个周期的公共时基叠加，以便重构信号。 在根据本发明的方法的具体实施例中，捕获具有高频分量的重复输入信号的一串样本，而不以相对低的时间分辨率触发来确定来自低分辨率采样的近似波形，然后进行数字信号处理 以快速傅里叶变换形式的技术应用于输入信号的重构时间记录，以获得每个信号分量的精确频率，最后通过参考公共时间或相位参考覆盖采样分量来重构采样波形 。 采用FFT非常精确地确定每个信号分量的频率。 可以采用进一步的处理，例如基于窗口函数的分组插值，以进一步提高分辨率。
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公开(公告)号：US5162723A
公开(公告)日：1992-11-10
申请号：US654451
申请日：1991-02-11
申请人： Michael S. Marzalek , Richard C. Keiter , John A. Wendler , Stephen R. Peterson , Ronald J. Hogan
发明人： Michael S. Marzalek , Richard C. Keiter , John A. Wendler , Stephen R. Peterson , Ronald J. Hogan
CPC分类号： G01R23/16
摘要： A sampling signal analyzer in which the frequency of an input signal to be measured is initially ascertained, an appropriate sampling frequency is then determined, data needed to reconstruct the wave form of the input signal is acquired, and the input signal wave shape is reconstructed with a calibrated time axis and preferably displayed. The sampling signal analyzer synthesizes a sampler drive signal to enable continuous sampling of the input signal and therefore has the advantage over known data sampling signal measurement instruments that it is not triggered directly in response to the level of the input signal to be measured. Instead, sample timing is based on numerical analysis of the intermediate frequency (IF) signal produced by the sampler. The IF frequency can be an arbitrarily low frequency, which allows digitizing and digital signal processing for aligning measurement data from sweep to sweep with precision. The sampling signal analyzer operates so that all frequency components of the input signal will lie within plus or minus an IF bandwidth away from a comb tooth of a sampling frequency and will translate (i.e., mix) and compress into the IF. The sampling signal analyzer determines where to mix the input signal in the IF based on the frequency of the input signal and a display time range selected by the operator. The number of cycles of the wave form being displayed can be selected by the operator, and the time axis is automatically rescaled to display the selected number of cycles, notwithstanding a change in the input signal frequency. A pulse profiling method enables the recoverable modulation bandwith of the sampling signal analyzer to be as wide as a high-frequency input bandwidth so that the response of high-frequency devices stimulated by pulsed or otherwise modulated signals can be measured.
摘要翻译： 首先确定要测量的输入信号的频率的采样信号分析器，然后确定适当的采样频率，获取重建输入信号的波形所需的数据，并且用 校准的时间轴并且优选地显示。 采样信号分析仪合成采样器驱动信号以使输入信号能够连续采样，因此与已知的数据采样信号测量仪器相比，它不会直接响应待测量的输入信号的电平而被触发。 相反，采样定时是基于采样器产生的中频（IF）信号的数值分析。 IF频率可以是任意低频，可以进行数字化和数字信号处理，从而将测量数据从扫描到扫描精度对齐。 采样信号分析仪的操作使得输入信号的所有频率分量将位于远离采样频率的梳齿的正或负的IF带宽内，并且将平移（即，混合）并压缩到IF中。 采样信号分析仪基于输入信号的频率和操作者选择的显示时间范围，确定在IF中混合输入信号的位置。 显示波形的周期数可以由操作者选择，时间轴自动重新缩放以显示所选择的周期数，尽管输入信号频率发生变化。 脉冲分析方法使得采样信号分析仪的可恢复调制带宽可以与高频输入带宽一样宽，从而可以测量由脉冲或其他调制信号激励的高频器件的响应。
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