Signal

FFT for real signals

FFT for real signals
  1. Is the FFT of a real signal real?
  2. Where FFT is used in real life?
  3. What is a real FFT?
  4. How is FFT useful to represent a signal?

Is the FFT of a real signal real?

Most real-world signals are real-valued. Therefore, you can use the real fast Fourier transform (FFT) for most applications. You also can use the complex FFT by setting the imaginary part of the signal to zero.

Where FFT is used in real life?

It is used in designing electrical circuits, solving differential equations , signal processing ,signal analysis, image processing & filtering.

What is a real FFT?

The real portion of an FFT result is how much each frequency component resembles a cosine wave, the imaginary component, how much each component resembles a sine wave.

How is FFT useful to represent a signal?

The FFT algorithm is used to convert a digital signal (x) with length (N) from the time domain into a signal in the frequency domain (X), since the amplitude of vibration is recorded on the basis of its evolution versus the frequency at that the signal appears [40].

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