Forums

order of autocorrelation/ASDF and interpolation?

Started by Unknown January 16, 2004
I asked this before under another subject line, but perhaps it got lost.

Assume I want the autocorrelation peak or best least squares fit of
sampled data for non-integer sample offsets (e.g. the periods of the
frequencies of interest are not a multiple of the sample interval).

Should I interpolate the data for the autocorrelation/ASDF?  Or should
I do the autocorrelation for integer sample offsets and interpolate the
result?  The former is a lot more computationally intensive, but does
it give any better result than the latter?

Thanks.

-- 
Ron Nicholson   rhn AT nicholson DOT com   http://www.nicholson.com/rhn/ 
#include <canonical.disclaimer>        // only my own opinions, etc.
In article bu9i7q$tvp$1@blue.rahul.net, Ronald H. Nicholson, Jr. at
rhn@nojunk.rahul.net wrote on 01/16/2004 15:40:

> I asked this before under another subject line, but perhaps it got lost. > > Assume I want the autocorrelation peak or best least squares fit of > sampled data for non-integer sample offsets (e.g. the periods of the > frequencies of interest are not a multiple of the sample interval). > > Should I interpolate the data for the autocorrelation/ASDF? Or should > I do the autocorrelation for integer sample offsets and interpolate the > result? The former is a lot more computationally intensive, but does > it give any better result than the latter?
ooops. sometimes i forget to watch threads that i have posted in. i'm posting a response on that thread "Re: Detecting the period of a signal", just to keep it easier for anyone following it or any progeny googling in some years later.
> Thanks.
r b-j