Realtime spectrum trigger system on realtime oscilloscope
一种滤波器、发生器的技术,应用在仪器、数字变量显示、数字变量/波形显示等方向,能够解决未考虑相位谱等问题
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[0014] now refer to figure 2 , a real-time spectrum trigger system on a real-time oscilloscope with features such as image 3 A user input portion 10 of the user interface is shown where the user may enter a desired trigger frequency 12, an amplitude threshold at the trigger frequency 14, and a phase crossing 16 at the trigger frequency. Based on user input, setup section 20 calculates filter parameters 22 from user-selected frequencies, square thresholds 24 from user-input magnitude thresholds, and quadrature I / Q ratios and quadrature I / Q ratios from user-selected phase crossings. Sign of the I component. In the setup section 20, the real-time oscilloscope performs several calculations and then uses the results of said calculations in the oscilloscope hardware. A discrete Fourier transform (DFT) is performed to obtain the spectrum at the desired trigger frequency.
[0015] (DFT)X(k)=∑ m=0-(N-1) ×(m)W N km =W N -kN ∑ m=0-(N-1) ×(m)W N km =∑ m=0-(N-1) ×(m)W N -k(...
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