How do i implement a gain of 10 inside my filter MAtlab?

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In MAtlab i have a filter with transfer functions coefficients A and B and then i use the 'filter' funtion syntax to implement the filter in our input signal.
Now i also need to implement a gain of 10 or 20 inside my filter so that i get an amplified signal.How do i do that?
ANy help will be appreciated

Accepted Answer

Jan
Jan on 16 May 2019
Edited: Jan on 16 May 2019
See this:
t = 1:30;
x = rand(1, 30); % Some test data
[b, a] = butter(3, 0.8); % A Butterworth filter
x1 = filter(b, a, x) * 4; % Filter and amplify
x2 = filter(b * 4, a, x); % Amplify internally
plot(t, x1, 'ro', t, x2, 'c-')
max(abs(x1-x2)) % 0.0, but some rounding error can be expected
  2 Comments
sachin narain
sachin narain on 16 May 2019
Thanks for the response so i should do b*4 (that is the denominator *4) right??

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