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用网络函数描述网络特性的方法,是网络分析和综合中经常采用的经典方法。网络函数和网络的状态无关,适合在频域中求解。称为近代方法的状态变量法,把高阶微分方程化成一阶的微分方程,采用矩阵运算:特别适于用数字计算机求解。它适于直接在时域中求解,又较容易推广到多端网络、非线性网络和时变网络。它们之间虽有本质的区别,但也有密切的联系。
The method of describing network characteristics with network functions is a classic method often used in network analysis and synthesis. Network functions have nothing to do with the state of the network and are suitable for solving in the frequency domain. The state variable method, called the modern method, converts high-order differential equations into first-order differential equations and uses matrix operations: it is especially suitable for solving with a digital computer. It is suitable for solving directly in the time domain, but also easier to be extended to multi-terminal networks, nonlinear networks and time-varying networks. Although there are essential differences between them, but there are close ties.