I have time data for 10000 points. What is the optimum value of Nfft to view frequency spectrum using FFT in signal processing tool box ?

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Elango Paulchamy
Elango Paulchamy 2016-5-22
回答： Star Strider 2016-5-22
I have time data for 10000 points. What is the optimum value of Nfft to view frequency spectrum using FFT in signal processing tool box ?

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Image Analyst
Image Analyst 2016-5-22
Star Strider
Star Strider 2016-5-22
The NFFT can be anything greater than 10000 for your signal. The fft is most efficient if it has a vector with the length of a power-of-two to work with. The next highest power-of-two should work.
See the nextpow2 function.

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