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After aligning two signals using xcorr, how to make both signals (varying) lengths equal?

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Antonio Morales
Antonio Morales on 28 Dec 2016
Commented: Antonio Morales on 28 Dec 2016
Hello,
I am using xcorr to synchronize two signals (S1, S2; from two different devices) of the same event. The function works well and signals get aligned. However, given that signals' length are not consistently equal (sometimes numel(S1) > numel(S2) and viceversa), I am struggling to efficiently clean the longest signal (at the beginning and / or at the end) and have the two signals aligned, with equal lengths.
Here is the code I am using:
[C22, lag22] = xcorr(S1, S2);
[M22,I22] = max(C22);
t22 = lag22(I22);
figure(1), plot(1:length(S1), S1, 'b', 1+t22:length(S2)+t22, S2, 'r'), title('S1 and S2 "Synch"')
How could I follow to make both S1 and S2 lengths equal, having into account that I am not aware of which signal will be longer at each particular case?
I really appreciate any help on this.
Thanks Antonio
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Answers (1)

Star Strider
Star Strider on 28 Dec 2016
You can also use the alignsignals function. It is a recent introduction (I believe one of the R2015 releases). It give several options for the output.

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