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Re: FFT and 'uneven' time data

From: macy
Subject: Re: FFT and 'uneven' time data
Date: Tue, 21 Apr 2009 08:54:38 -0700 (PDT)
User-agent: SquirrelMail/1.4.13

> On Apr 21, 2009, at 4:45 PM, address@hidden wrote:
>> How do I easily handle obtaining an FFT when the data is NOT evenly
>> spaced
>> in time?
>> I wrote my own program to create a new variable with evenly spaced
>> data
>> using linear interpolation, which works fine, except it does not
>> decimate,
>> it only adds in so the smallest step becomes the final step [obviously
>> creating a huge data base], plus with data that has jitter, does not
>> work
>> as well.
>> Is there some way to obtain an FFT directly given the time base of the
>> data is not evenly spaced *and* contains jitter?
>> Robert
> The simple and somewhat dirty solution is to interpolate your original
> data using a smooth interpolation to evenly spaced times. Otherwise,
> take a look at this:
> Cheers
> Matthias


Thank you for this URL.  Opened up a whole new area in looking for "Lomb


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