Remove steps of adjacent points
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Hi,
I have a signal which shows repeating lower peaks due to end point and new starting point being on a different level. What is the fastest and easiest way to remove the step/peak and lift all points to the right in such a way that the two connecting points are on the same level and the rest of the signal is lifted with the same amount.
Thanks.
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Matt J
2021-9-10
编辑:Matt J
2021-9-10
Perhaps as follows:
threshold=0.5;
t=0:0.01:3;
signal=log(mod(t,1)+1);
D=diff(signal(:).');
D(abs(D)>threshold)=0;
signal2=cumsum([signal(1),D]);
plot(t,signal, '-x',t,signal2); legend('Original','Modified')
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Image Analyst
2021-9-10
You said you have "lower peaks due to end point". So it's always the last point that drops. So the last point is bogus and should basically be ignored? Are you obtaining a sequence of signals, And then you just stitch on the next signal onto the master, growing signal? So you could do
allSignals = [];
for k = 1 : numberOfSignalsToStitch
thisSignal = HoweverYouGetIt();
% Crop off/ignore last element.
thisSignal(end) = [];
if k == 1
allSignals = thisSignal;
else
% Put first point where last point is
thisSignal = thisSignal - thisSignal(1) + allSignals(end);
% This will "lift" the current signal to the end of the last signal.
allSignals = [allSignals, thisSignal]
end
end
If you need more help, attach your signal(s) in a .mat file.
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