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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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
le 22 Mai 2016
Study up on the Nyquist Frequency: https://en.wikipedia.org/wiki/Nyquist_frequency and Nyquist rate: https://en.wikipedia.org/wiki/Nyquist_rate
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Star Strider
le 22 Mai 2016
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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