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.
order of autocorrelation/ASDF and interpolation?
Started by ●January 16, 2004
Reply by ●January 17, 20042004-01-17
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