u_chb1ap.m

来自「the file contain many matlab signal sour」· M 代码 · 共 20 行

function [b,a]=u_chb1ap(N,Rp,OmegaC);
% Unnormalized Chebyshev -1 Analog Lowpass Filter Prototype
% -------------------------
% [b,a]=u_chb1ap(N,Rp,OmegaC)
% b=numberator polynomial coefficients
% a=denominator polynomial coefficients
% N=Order of the Chebyshev -1  Filter 
% Rp=Passband Ripple in dB;Rp>0
% OmegaC=Cutoff frequency in radians/sec
% 
[z,p,k]=cheb1ap(N,Rp);
a=real(poly(p));
aNn=a(N+1);
p=p*OmegaC;
a=real(poly(p));
aNu=a(N+1);
k=k*aNu/aNn;
b0=k;
B=real(poly(z));
b=k*B;