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一、概述由网络理论可知,滤波器的频响特性可用下式传递函数H(s)表示H(s)=V_0(s))/(V_4(s)=a_ms~m+a_(m-1)s~(m-1)+…+a_1s+a_0/b_ns~n+b_(n-1)s~(n-1)+…+b_1s+b_0 式中a、b为实常数;m、n=1,2,…(m≤n);s为复频率(s=jw);V_0(s)代表输出信号,它的每个根值代表一个零点;V_i(s)代表输入信号,每个根对应一个极点。一个n阶传递函数可分解成H_1,H_2,…,H_n各因式的乘积,每一因式可计算得一个滤波节,将各滤波节电路级联后就成为具有n阶传递函数特性的滤波器。现代网络理论已获得一系列各具特色的、标准传递函数。
I. Overview From the network theory shows that the frequency response characteristics of the filter can use the following transfer function H (s) that H (s) = V_0 (s)) / (v_4 (s) = a_ms ~ m + a_ ) s ~ (m-1) + ... + a_1s + a_0 / b_ns ~ n + b_ (n-1) s ~ (n-1) + ... + b_1s + b_0 where a and b are real constants; m, n = 1,2, ... (m≤n); s is the complex frequency (s = jw); V_0 (s) represents the output signal and each of its roots represents a zero; V_i (s) represents the input signal, Root corresponds to a pole. An n-th transfer function can be decomposed into the product of H_1, H_2, ..., H_n each factor, each factor can be calculated as a filter node, cascaded filter nodes become n order Transfer function characteristics of the filter. Modern network theory has been a series of distinctive, standard transfer function.