xcorr function doesnt change its max. even i delayed the signal

Question

badr 2013-10-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/89997-xcorr-function-doesnt-change-its-max-even-i-delayed-the-signal

回答： badr 2013-10-12

Hi, Iam trying to do some stuff about calculating the delay between two signals by using the difference between the two max.'s of the correlation functions that will be calculated so, i wrote a small code:

>> a=[ones(1,5),zeros(1,5),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5)]; >> plot(a); >> plot(b); >> b=[zeros(1,26),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5)]; >> plot(b); >> c=[zeros(1,30),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5)]; >> plot(c); >> plot(xcorr(a,c)); >> plot(xcorr(a,b));

now xcorr(a,c) is the same of xcorr(a,b) despite of the predicted result of xcorr(a,c) is that it will be shifted by 3 from xcorr(a,b

PLZ, can any one help me in this ?

THNX for reading.

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Matt J 2013-10-12

Please apply the

formatting button to your code to make it readable.

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Answer 1

badr 2013-10-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/89997-xcorr-function-doesnt-change-its-max-even-i-delayed-the-signal#answer_99424

在 MATLAB Online 中打开

if true
 >> a=[ones(1,5),zeros(1,5),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5)]; >> plot(a); >> plot(b); >> b=[zeros(1,26),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5)]; >> plot(b); >> c=[zeros(1,30),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5),ones(1,5),zeros(1,5)]; >> plot(c); >> plot(xcorr(a,c)); >> plot(xcorr(a,b));
end

sorry for that

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Image Analyst 2013-10-12

You'd get more enthusiastic help if you made it easier for us, like don't have the if true stuff in there (you probably clicked {}Code before you pasted in the code instead of afterwards), and don't have >> and make it just commands like we can copy and paste into an m-file script.

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