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

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Sachin NARAIN 2019-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/462399-how-do-i-implement-a-gain-of-10-inside-my-filter-matlab

评论： Jan 2019-5-16

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

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Answer 1

Jan 2019-5-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462399-how-do-i-implement-a-gain-of-10-inside-my-filter-matlab#answer_375292

编辑：Jan 2019-5-16

在 MATLAB Online 中打开

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