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带通滤波器和低通滤波器的阶跃响应上升时间τ_d与带宽B乘积等于常数的结论,对分析滤波器的动态特性,合理选用频率分析时滤波器参数等方面都很重要。但在测试技术教学中,用数学方式推导证明这个结论的必要性就不大。而用实验的方法来验证这个结论,则事半功倍,一目了然。并可求出滤波器的具体上升时间τ_d。
It is very important to analyze the dynamic characteristics of the filter and choose the filter parameters in the frequency analysis reasonably when the product of the step response rise time τ_d and the bandwidth B of the band-pass filter and the low-pass filter is constant. However, in the teaching of testing techniques, it is not necessary to prove this conclusion mathematically. The experimental method to verify this conclusion, then a multiplier, at a glance. And can find the concrete rise time τ_d of the filter.