how do you detemine the gain factor using matlab. In this code they multipled a gain factor by y(n) the signal

subplot(3,1,3);
plot(m,y);
title('Filtered Signal');
xlabel('n');
ylabel('x');

n = n +1;
end

figure(n);
subplot(3,1,1);
plot(m,C);
xlabel('n');
ylabel('x');
title('ecg3.wav');
subplot(3,1,2);
plot(m,X);
xlabel('n');
ylabel('x');
title('ecg3.plushum');

b=[1 -.6 1];
a=[1 0 0];
y1=(1.432174).*filter(b,a,X); 
subplot(3,1,3);
plot(m,y1);
xlabel('n');
ylabel('x');
title('Filtered Signal with Gain');

Answer 1

[Image Analyst]

I fixed your formatting but read this for next time.

There is no way for us to determine why the authors wanted a gain of 1.432174 because we don't know what they want to do with it afterwards. You may not need to multiply by anything so don't worry about it. If you need a gain, then you'll probably know you do and you will know the amplitude of the gain you need, just like they did.