Align and subtract similar signals

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Ni Wi
Ni Wi 2018-3-3
评论： Jyotish Robin 2018-3-19
I have two signals (T0 and T1) and want to subtract them from each other:
This code using cross-correlation works for me nearly every time, except in this example:
% find cross-correlation
[acor,lag] = xcorr(T1,T0);
[~,I] = max(abs(acor));
lagDiff = lag(I);
% shift T0 to T1
T0_shifted = circshift(T0,lagDiff);
% stretch T0, so that it meets the height of T1
T0_shifted = T0_shifted * max(T1)/max(T0_shifted);
The signal is shifted to the wrong position, because xcorr() returns a maximum at an unwanted position:
Are there any ways to 'tweak' xcorr() or any alternative methods for aligning graphs?
  1 个评论
Jyotish Robin
Jyotish Robin 2018-3-19
I am not quite able to understand why do you think the two signals are similar. From what I see in your figure, the orange signal has an extra heavy bump around x=125. What is your expected shift needed to align the two signals?

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