Find discontinuities and lift up or pull down the part after the discontinuity

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lena kappa
lena kappa el 13 de Dic. de 2021
Comentada: Jan el 24 de Dic. de 2021
Hi everyone i have a singal with discontinuities.Does anyone know how can i find the discontinuities and at those points lift up or pull down the remaining signal?
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lena kappa
lena kappa el 13 de Dic. de 2021
Sorry!
This is one of my datasets (my x axes is just 1:800)
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which gives me this

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Respuesta aceptada

Jan
Jan el 13 de Dic. de 2021
Ran in:
x = linspace(1, 10*pi, 200);
y = sin(x);
y(60:90) = y(60:90) + 1;
y(120:180) = y(120:180) - 1;
yOrig = y;
limit = 0.2;
dy = [0, diff(y)];
jump = strfind(abs(dy) > limit, [false, true, false]);
for ijump = 1:numel(jump)
k = jump(ijump);
y(k+1:end) = y(k+1:end) - dy(k+1);
end
figure
axes('NextPlot', 'add')
plot(x, yOrig, '-r', x, y, 'bo')
y2 = lowpass(y, 30, 200);
plot(x, y2, 'c+')
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lena kappa
lena kappa el 23 de Dic. de 2021
@Jan how did you choose the numbers 30 and 200 in
y2 = lowpass(y, 30, 200);
Jan
Jan el 24 de Dic. de 2021
@lena kappa: See the documentation of lowpass:
y = lowpass(x,fpass,fs) specifies that x has been sampled at a rate of fs hertz. fpass is the passband frequency of the filter in hertz.
The result is stable over a wide range of parameters.

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Image Analyst
Image Analyst el 13 de Dic. de 2021
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lena kappa
lena kappa el 14 de Dic. de 2021
i think i understood it! sorry to bother you again
Image Analyst
Image Analyst el 15 de Dic. de 2021
I guess those were just some parameters to cause a chunk of the waveform to shift by a reasonable amount.

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