signal processing

how to take a auto correlation of signal?what is the difference between auto correlation and cross correlation? if we take auto correlation of a signal what do we infer from this?please help me,,, thank in advance....

[Daniel Shub]

As it stands this isn't a MATLAB question.

Answer 1

[Honglei Chen]

You can us xcorr to do both auto and cross correlation, e.g.,

xcorr(x,x)
xcorr(x,y)
doc xcorr

Auto correlation is the correlation between one signal and itself while cross correlation is the correlation between two different signals. The autocorrelation can tell you, for example, whether there is periodic component in the signal.