Digitally filtered data that has been decimated yields a FID whose first n
points are zero. FT of this FID gives a spectrum requiring thousands of
degrees of linear phase correction.
Years back, Milo Westler was kind enough to share his solution to this,
which is to do a cyclic rotation of n points, where n is obtained from a
lookup table based on decimation number and dsp firmware version.
We've now encountered data with
DECIM = 432
DSPFVS = 20
The info we have doesn't extend to this firmware version. Wondering if
anyone has extended Milo's table to higher firmware versions, and might be
willing to share.
many thanks!
******************************************************
Virginia W. Miner, Ph.D. gina_at_acornnmr.com
Acorn NMR Inc. (925) 456-1020
7670 Las Positas Rd. (925) 456-1024 fax
Livermore, CA 94551
http://www.acornnmr.com
Received on Wed Mar 29 2006 - 09:30:59 MST