Frequencies

How should this fft output be intepreted?

How should this fft output be intepreted?
  1. What does the output of an FFT represent?
  2. How do you read frequencies in FFT?

What does the output of an FFT represent?

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.

How do you read frequencies in FFT?

The first bin in the FFT is DC (0 Hz), the second bin is Fs / N , where Fs is the sample rate and N is the size of the FFT. The next bin is 2 * Fs / N . To express this in general terms, the nth bin is n * Fs / N .

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