What is the best Algorithm to estimate the frequency for Almost-Periodic Data or complex periodic data?

1. What is the main advantage of FFT?
2. How do you find the frequency of FFT?
3. What is FFT formula?

What is the main advantage of FFT?

The main advantage of an FFT is speed, which it gets by decreasing the number of calculations needed to analyze a waveform.

How do you find the frequency of FFT?

Let X = fft(x) . Both x and X have length N . Suppose X has two peaks at n0 and N-n0 . Then the sinusoid frequency is f0 = fs*n0/N Hertz.

What is FFT formula?

The fast Fourier transform has become a major DSP tool since being popularized by Cooley and Tuckey in 1965. In the FFT formula, the DFT equation X(k) = ∑x(n)W_N^nk is decomposed into a number of short transforms and then recombined.