How Can I correct amplitude and smoothness of FFT?

1. What is the amplitude of an FFT?
2. How is amplitude calculated for FFT?
3. Does Fourier Transform give amplitude?
4. What causes harmonics FFT?

What is the amplitude of an FFT?

The frequency axis is identical to that of the two-sided power spectrum. The amplitude of the FFT is related to the number of points in the time-domain signal.

How is amplitude calculated for FFT?

1) Division by N: amplitude = abs(fft (signal)/N), where "N" is the signal length; 2) Multiplication by 2: amplitude = 2*abs(fft(signal)/N; 3) Division by N/2: amplitude: abs(fft (signal)./N/2);

Does Fourier Transform give amplitude?

Figure 7: Time domain signals (left) and their corresponding Fourier Transforms (left). A sine wave is the most fundamental component of a Fourier Transform. A Fourier Transform of a sine wave produces a single amplitude value with corresponding phase (not pictured) at a single frequency.

What causes harmonics FFT?

Harmonics "happen" when your input to an FFT isn't a pure unmodulated sine wave. Any unexpected distortion in your input waveform generation (from being exactly identical to mix of sin(wt) + cos(wt)) can be the cause of harmonics appearing in an FFT result (above the noise floor and any windowing artifacts).