dfdxmax.m

AFD - Advanced Filter Design using MATLABMiroslav D. Lutovac, Dejan V. Tosicversion 1.00 released 15

function amax = dfdxmax(n, Fp, Fs, Kp, Ks)

% dfdxmax.m  DFD Maximum selectivity
%
%   Authors: Dejan V. Tosic, Miroslav D. Lutovac, 1999.03.08
%                 [e-mail]
%                 [e-mail]
%
%   Copyright (c) 1999 by Tosic & Lutovac
%   $Revision: 1.0 $  $Date: 1999/03/08 03:07:42 $
%
%   References:
%        Miroslav D. Lutovac, Dejan V. Tosic, Brian L. Evans
%           Advanced Filter Design for Signal Processing
%                   Using MATLAB and Mathematica

%  calls:
%% dfdrx.m

nxkskp = [n tan(pi*Fs)/tan(pi*Fp) Ks Kp];
global DFD_n_x_Ks_Kp;
DFD_n_x_Ks_Kp = nxkskp;

mm = fmins('dfdrx',sqrt(tan(pi*Fs)/tan(pi*Fp)-1));
amax = 1+mm^2;