low_mul_d.m

信号处理－滤波器设计（基于matlab和Mathmatica的设计方法）中关于无乘法器椭圆IIR滤波器设计的原创程序。

function [Dp,Ds]=Low_Mul_D(Ap,As)
%  Low_Mul_D.m 计算Dp和Ds
%  $date 11/10/2005
%
%   作者：赵泽平
%      [e-mail]
%   
%
%   References:
%        Miroslav D. Lutovac, Dejan V. Tosic, Brian L. Evans
%           Advanced Filter Design for Signal Processing
%                   Using MATLAB and Mathematica
Dp=acos(1-10^(-Ap/20));
Ds=pi/2-acos(10^(-As/20));