Number of periods of signal required when doing an FFT

1. How many periods do I need for FFT?
2. How many samples do I need for FFT?
3. How do you find the period of a signal using FFT?
4. How many points do you need for FFT?

How many periods do I need for FFT?

Number of periods of signal required when doing an FFT: 1

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How many samples do I need for FFT?

The number of samples (N) in the FFT must be an integer power of 2. Therefore, N = 2^p, where p is a positive integer. This rule minimizes the number of multiplications—and therefore the computation time—needed to compute the coefficients of the Fourier series.

How do you find the period of a signal using FFT?

The peak in an FFT magnitude result represents frequency, which is the reciprocal of the period. Multiply the frequency index reciprocal by the FFT window length to get the period result in the same units at the window length.

How many points do you need for FFT?

Because the FFT function uses a base 2 logarithm by definition, it requires that the range or length of the time series to be evaluated contains a total number of data points precisely equal to a 2-to-the-nth-power number (e.g., 512, 1024, 2048, etc.).