Re: Signal smoothing

On Wed, Dec 30, 2020 at 1:42 AM Blaz <[email protected]> wrote:

> Hello again
>
> This time I have a problem of signal smoothing. I have an input signal (x)
> which I import from a .cvs file. It is in principle the combination of sine
> wave with added exponential decay. However I would like to smooth the
> signal
> with an exponential function (T is a time constant which is a setting) fro
> mlocal tops. These tops are not always the same so simply max (x) does not
> work. This is my attempt below, but it does not work properly. Any advise
> appreciated.
>
>
> function [xs] = smooth (t,x,T)
>
>   if nargin <3
>     T =0.064;                    % konstanta za glajenje Stab toka (Siemens
> 7SS52 Manual, str 94)
>   end
>   temp=0;
>   f=1;
>   AX=max(x);
>   m=length(x);
>   xs=zeros(m,1);
>   lookback=10;
>
>   for i = 1 : m
>     u(i) = exp(-(t(i))/T);
>   end
>   xs(1:lookback) = x(1:lookback);
>
>   for j = lookback : m
>
>     if AX*u(f) < x(j)
>       xs(j) = x(j);
>       f=1;
>     end
>
>     if AX*u(f) > x(j)
>       xs(j) = AX*u(f);
>       f++;
>     end
>
>   end
>
>  plot(t,x,t,xs)
> endfunction
>
>
>
>
> ex.png <https://octave.1599824.n4.nabble.com/file/t373917/ex.png>
>
>
>
> --
> Sent from:
> https://octave.1599824.n4.nabble.com/Octave-General-f1599825.html
>
>
>
Are you trying to overcome noise?

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