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%
% Copyright 2004 Free Software Foundation, Inc.
%
% This file is part of GNU Radio
%
% SPDX-License-Identifier: GPL-3.0-or-later
%
%
function plot_cic_decimator_response (R, N, M)
%% R = decimation rate
%% N = number of stages (4)
%% M = 1
gain = (R*M)^N
npoints = 1024;
w = 0:1/npoints:1-1/npoints;
w = w * 1 * pi;
%% w = w * R;
length(w);
num = sin (w*R*M/2);
length (num);
%% H = sin (w*R*M/2) ./ sin (w/2)
denom = sin(w/2);
length (denom);
H = (num ./ denom) .^ N;
H(1) = gain;
H = H ./ gain;
plot (R*w/(2*pi), 10 * log10 (H));
%% plot (R*w/(2*pi), H);
endfunction
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