I am trying to find out the time delay between two signals using crosscorrelation.

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Add 2016 年 8 月 11 日
コメント済み: Pham Dang 2016 年 8 月 12 日
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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Pham Dang
Pham Dang 2016 年 8 月 11 日
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" ?)
  2 件のコメント
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Add 2016 年 8 月 11 日
編集済み: Add 2016 年 8 月 11 日
What I have given is the sampling rate of the data. But by mistake I wrote it in milliseconds. The sampling rate is 30 seconds . What is my sampling period here in this case??
Pham Dang
Pham Dang 2016 年 8 月 12 日
Please read the definition of sampling rate and sampling period : Sampling (signal processing)

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