Azzera filtri
Azzera filtri

xcorr lag input to time?

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FsC il 23 Mag 2023
Modificato: FsC il 24 Mag 2023
I am trying to find the cross-correlation of two 1x180000 vectors (sigX and sigY). The sampling frequency is fs=1000. I am trying to find the xcorr with a lag of 30 s. How do I input the lag of -30:30 sec to the xcorr function given the sampling rate?
[c,lags] = xcorr(x,y,LAGS,'normalized');
The input 'm asking about is LAGS. Is this input in samples or time? If time, what unit of time?
Thank you

Risposta accettata

David Goodmanson
David Goodmanson il 24 Mag 2023
Modificato: David Goodmanson il 24 Mag 2023
Hi Carly,
lags is a dimensionless index, so it's in samples (it has to be samples since xcorr has no way of knowing what fs might be). Since sampling frequency times a time interval is the number of samples, the input to xcorr is LAGS = (-30:30)*fs, a dimensionless index.
(This is assuming that 30* fs is exactly an integer, otherwise some rounding will be involved).

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