I want to remove the noise of this Signal

Hi there,

I have the following signal, i need to calculate it derivative but it is full of noise.

what should i use to get rid of the noise

Answer 1

[Star Strider]

If you have R2017a or later, use the smoothdata function:

D = load('matlab.mat');
Temperature = D.Temperature;

ys = smoothdata( Temperature, 'movmean', 100);                   % R2017a

figure
plot(Temperature, '-b')
hold on
plot(ys, '-r')
hold off
grid

That appears to work well.

EDIT — (24 Apr 2020 at 16:55)

If you have an earlier version/release, this works about as well:

N = 15;
ys = filter(ones(1,N), N, Temperature - Temperature(1), zeros(1,N-1)) + Temperature(1);

Use those two assignments instead of smoothdata.