I am trying to find out the time delay between two signals using crosscorrelation.
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Hi The sampling rate of my data is 30 milliseconds. If hd and pd are my two time series data, I use
crosscorr (hd,pd)
to compute crosscorrelation. and
D = finddelay (hd,pd)
Now the value of D is -2. What do I infer from it ?? How much is the time delay ??
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Answers (1)
Pham Dang
on 11 Aug 2016
First paragraph of
help finddelay
ends by : If Y is delayed with respect to X, D is positive. If Y is advanced with respect to X, D is negative.
Therefore your sequence pd is advanced by 2 samples with respect to hd.
The delay (in time) is equal to the number of samples multiplied by the sampling period.
(By the way, the unit of measurement of a sampling rate is "samples/seconds" or "Hz" and not "seconds" ; therefore, did you give the sampling "rate" or the sampling "period" ?)
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Pham Dang
on 12 Aug 2016
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