u_elipap.m

the file contain many matlab signal source code and many example .

function [b,a]=u_elipap(N,Rp,As,OmegaC);
% Unormalized Elliptic Analog Lowpass Filter Prototype
% -------------------------------
% [b,a]=u_elipap(N,Rp,As,OmegaC)
% b=numberator polynomial coefficients
% a=denominator polynomial coefficients
% N=Order of the Elliptic Filter 
% Rp=Passband Ripple in dB;Rp>0
% As=Stopband Attenuation in dB;As>0
% OmegaC=Cutoff frequency in radians/sec
% 
[z,p,k]=ellipap(N,Rp,As);
a=real(poly(p));
aNn=a(N+1);
p=p*OmegaC;
a=real(poly(p));
aNu=a(N+1);
b=real(poly(z));
M=length(b);
bNn=b(M);
z=z*OmegaC;
b=real(poly(z));
bNu=b(M);
k=k*(aNu*bNn)/(aNn*bNu);
b0=k;
b=k*b;