Did Cross Correlation Function Go Away?

[captquin]

New to REW and one of the guides I'm following mentions cross correlation. I don't see it in the controls menu. Did it move? Will time alignment serve the same function?

Thanks!

 

[John Mulcahy]

That is in the 5.20.14 early access builds.

 

[captquin]

Thanks. For us new folks, how does it differ from time alignment?

 

[John Mulcahy]

From the All SPL graph help in that build:

Time align, which brings all the currently selected measurements into time alignment. If the measurements have been made with a timing reference (a loopback connection or an acoustic timing reference) the impulse response is shifted according to the measurement delay value, taking into account any IR timing offsets which have been applied since the measurement delay was calculated. Measurements which have been made without a timing reference are shifted according to the estimated IR delay. Time alignment can only be applied to measurements that have an impulse response.

Cross corr align, which time aligns the currently selected measurements by cross correlation of their windowed impulse responses, using the measurement which appears first in the list of those selected as the reference (the order of measurements can be changed by dragging them up or down the list). This may be useful to align measurements from a mic array or measurements of the same source from different positions prior to vector averaging.