Expected flat FFT

1. What does amplitude in FFT mean?
2. What the FFT analysis of a signal tells us about the signal?
3. What is FFT spectrum analysis?

What does amplitude in FFT mean?

The amplitude of the FFT is related to the number of points in the time-domain signal. Use the following equation to compute the amplitude and phase versus frequency from the FFT. where the arctangent function here returns values of phase between –π and +π, a full range of 2π radians.

What the FFT analysis of a signal tells us about the signal?

The output of the FFT is a complex vector containing information about the frequency content of the signal. The magnitude tells you the strength of the frequency components relative to other components. The phase tells you how all the frequency components align in time.

What is FFT spectrum analysis?

The FFT spectrum analyzer samples the input signal, computes the magnitude of its sine and cosine components, and displays the spectrum of these measured frequency components. Why Look at a Signal's Spectrum? For one thing, some measurements which are very hard in the time domain are very easy in the frequency domain.