In this paper, the effect of differentialfilter on joint power spectrum has been analyzed and so-called power spectrum differentialfilter is introduced.
分析了微分滤波对联合变换功率谱的影响，得到了一种称之为功率谱形式的微分滤波器。
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Particle filters should include (or pressure differential gauge display), so as to explain when should change the filter medium, when filter service life to also shall be replaced.
The toroidal core was excited by sharp pulse current. The sensor circuit is composed of peak value detector, Butterworth low-pass filter and differential amplifier.