Output of fft

1. What is the output of an FFT?
2. What is the output of FFT in Matlab?
3. What does FFT function return?
4. What is the output of a DFT?

What is the output of an FFT?

These frequencies actually represent the frequencies of the two sine waves which generated the signal. The output of the Fourier transform is nothing more than a frequency domain view of the original time domain signal. For more information and background on the Fourier transform, take a look at this link.

What is the output of FFT in Matlab?

The Discrete Fourier Transform, which an FFT algorithm computes quickly, assumes the input data of length N is one period of a periodic signal. The period is 2*pi rad . The frequency of the output points is given by 2*n*pi/N rad/sec , where n is the index from 0 to N-1 .

What does FFT function return?

The FFT function returns a result equal to the complex, discrete Fourier transform of Array. The result of this function is a single- or double-precision complex array.

What is the output of a DFT?

All DFT outputs for a real N-sample input sequence with even N follow this pattern: 1 real value, N/2-1 complex values, 1 real value, N/2-1 conjugates. A diagram of the 64-point example is shown below, where blue squares indicate non-redundant information.