For the convenience of time -domain convolution, the vector fitting method is adopted to approach the characteristic impedance and delay function in complex frequency-domain.
为了便于时域卷积，对不同模量上的特征阻抗和延时函数在复频域采用矢量匹配法进行拟合。
Convolution integral is a mathematical method applied to calculus the zero state response of continuous-time systems.
卷积积分是计算连续时间系统零状态响应的数学工具。
Secondly, a SLM method based on the DFT property of the time domain circular convolution is studied.
然后重点分析了基于DFT的时域循环卷积性质的选择映射（SLM）方法，提出了一种基于SLM的改进方法。
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