Exporting Excess Group Delay data

[AlejandroIDS]

Dear All: Do you know if REW allows exporting the excess group delay spectrum data? How? Thank you!

 

[John Mulcahy]

There aren't any options to export group delay data yet, sorry. A feature to export data for any of the graphs is on the todo list though.

 

[AlejandroIDS]

Thank you for the fast answer.
I have another question:
To find the Excess Delay Group, I understand REW does this: Calculates the "minimum phase RIR" through the Hilbert transform of the "original RIR", then calculates the Group Delay of the "original RIR" and of the "minimum phase RIR", and finally calculates the Excess Group Delay by subtracting both Group Delays.
Am I right?
Thank you in advance.
Best!

 

[John Mulcahy]

Yes, though the minimum phase IR is calculated via the real Cepstrum.

 

[AlejandroIDS]

Thank you John for your fast answer.
Why did you use real Cepstrum instead of FFT ( Analytic (RIR;Hilbert(RIR))) to find the minimum phase RIR?
Thank you in advance.
Alejandro.

 

[John Mulcahy]

I tried a few different methods using different Hilbert transform algorithms and the real Cepstrum, they gave pretty much the same result so just used real Cepstrum.

 

[AlejandroIDS]

Thank you John for your fast answer.
Probably I´ll contact you in the near future with more questions.
Thank you!
And thank you for REW.