dfdv.m

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

function u = dfdv(v)

% dfdv.m  DFD v(v)
%
%   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

global ELLIP_ML ELLIP_EPSILON;
mL = ELLIP_ML;
e = ELLIP_EPSILON;

[s,c] = ellipj(v,mL);
u = abs( 1/sqrt(1+e^2) - c/e );