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

4 次查看（过去 30 天）
Add
Add 2016-8-11
评论： Pham Dang 2016-8-12
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 ??

请先登录，再回答此问题。

回答（1 个）

Pham Dang
Pham Dang 2016-8-11
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 个评论
Add
Add 2016-8-11
编辑：Add 2016-8-11
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??

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by