dfdncheb.m

来自「AFD - Advanced Filter Design using MATLA」· M 代码 · 共 24 行

function ncheb = dfdncheb(Fp,Fs,Kp,Ks)

% dfdncheb.m  ADFD minimum Chebyshev order
%
% 16:47  17/2/99
%
%   Authors: Dejan V. Tosic, Miroslav D. Lutovac, 1999.02.08
%                 [e-mail]
%                 [e-mail]
%
%   Copyright (c) 1999 by Tosic & Lutovac
%   $Revision: 1.0 $  $Date: 1999/02/08 03:07:42 $
%
%   References:
%        Miroslav D. Lutovac, Dejan V. Tosic, Brian L. Evans
%           Advanced Filter Design for Signal Processing
%                   Using MATLAB and Mathematica

k      = tan(pi*Fp)/tan(pi*Fs);
L     = Ks/Kp;
num   = acosh(L);
den   = acosh(1/k);
ncheb = ceil(num/den);