Frequency

FFT uncertainity in frequency

FFT uncertainity in frequency
  1. What is the uncertainty of frequency?
  2. How does sampling frequency affect FFT?
  3. What is the frequency of FFT?

What is the uncertainty of frequency?

The frequency uncertainty is determined by the receiver's frequency accuracy, and is related to the frequency span in which the signal was captured or measured.

How does sampling frequency affect FFT?

The amplitude of the DFT (FFT) is proportional to the number of samples. Therefore, if you sample for twice as long at the same sampling frequency, or if you sample for the same duraiton but twice as fast, you will have twice as many data points, and the DFT amplitude will be twice as large. See examples below.

What is the frequency of FFT?

Your kth FFT result's frequency is 2*pi*k/N.

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