EllipFilt.m

% MATLAB Code
% Generated by MATLAB(R) 9.9 and Signal Processing Toolbox 8.5.
% Generated on: 14-Dec-2020 15:39:25

% Elliptic Lowpass filter designed using FDESIGN.LOWPASS.

% All frequency values are in Hz.
Fs = 250;  % Sampling Frequency

Fpass = 3;       % Passband Frequency
Fstop = 5;       % Stopband Frequency
Apass = 0.5;     % Passband Ripple (dB)
Astop = 40;      % Stopband Attenuation (dB)
match = 'both';  % Band to match exactly

% Construct an FDESIGN object and call its ELLIP method.
h  = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd = design(h, 'ellip', 'MatchExactly', match);

% flatten coefficients for ARM
coeffs = reshape(Hd.sosMatrix(:,[1 2 3 5 6])' .* [1 1 1 -1 -1]',[],1);
% create string for copy/paste, cut off last ,\n
coeffStr = sprintf('%1.10ff,\n',coeffs);
disp(coeffStr(1:end-2));