Thread: FFT with unevenly sampled data in SAC

This question has no simple answer, and is the subject of current research.
As a starting point you might look at the following papers:
I. M. Fodor and P. B. Stark, Multitaper Spectral Estimation for Time
Series with Gaps,
IEEE transactions on Signal Processing, Vol 48, No 12 December, 2000
and
www.congrex.nl/09c24/S3_Posters/S3_P05_Smith_paper.pdf

Hope this helps.
LeRoy Dorman

LeRoy M. Dorman
Professor Scripps Institution of Oceanography, MC0220
University of California, San Diego
9500 Gilman Drive, La Jolla, CA 92093-0220
voice: +1 858 534-2406 fax: +1 858 534-6849 inet: ldorman<at>ucsd.edu
http://www.mpl.ucsd.edu/people/ldorman/index.html

Physical address:
436 Ritter Hall
8635 Charles Kennel Way (formerly Discovery Way)
La Jolla, CA 92037


Mac Green wrote:

Hi all,

I am using data collected with labview and saved as text files. I have
to sets of data,
the amplitude data set and a set of time intervals which are not even.

I use readtable to import the data into sac and then write it as a sac
file. If my data
was evenly sampled, I would use delta in the header to give the time
interval. Does anyone
know how I can get the FFT of data whose delta is not constant, it I
have a second file with
time intervals?

Thanks.