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Topic: is it necessary to taper the begin and the end of a time series before fft?
Replies: 3   Last Post: May 15, 2014 9:04 PM

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Derek Goring

Posts: 3,919
Registered: 12/7/04
Re: is it necessary to taper the begin and the end of a time series
before fft?

Posted: May 15, 2014 6:14 AM
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On Thursday, May 15, 2014 7:41:08 PM UTC+12, Ha wrote:
> Someone told me that if the value of the beginning is quite different from the value of the end of the time series, some unexpected results may rise.
>
>
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> Is it necessary to taper the begin and end to zero when using the built-in fft function of matlab?


Yes.
Google this: Gibbs Phenomenon



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