The convolution sum and integral 回旋和与回旋积分
By using the property of the separative matrices, a new approach to the convolution integral is presented.
应用分离矩阵的性质，得到了一类求解卷积的新方法。
There are two difficult points in convolution integral: how to determine the limit of the integral, and the integrands on the convolution integral.
确定卷积积分的积分限和在相应区间上的被积函数是计算卷积积分的两个难点。
The zero state response to an arbitrary excitation in a fist order circuit can be solved by either the convolution integral or the three element method.
一阶电路在任意激励下的零状态响应，既可以用卷积积分法，也可以用三要素法进行分析与计算。
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