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(上接本刊 2 0 0 1年第 2期第 47页 )7 从无限连续到有限离散前面已经讨论了有关连续时间 L TI系统的一些概念。然而 ,在用计算机软件实际进行处理时使用的是离散的数字序列。必须清楚离散系统和连续系统之间的一些重要差别。7.1 连续周期信号的傅里叶级数首先从傅里叶分析的
(Continued from issue 2, 2001, p. 47) 7 From Infinite Consecutive to Finite Discrete Some concepts of continuous-time LTI systems have been discussed earlier. However, discrete numerical sequences are used when actually processing with computer software. Some important differences between discrete systems and continuous systems must be clear. 7.1 The Fourier series of continuous-period signals are first analyzed from Fourier