Estimate mean amplitude in frequency range using fft

1. How is amplitude calculated for FFT?
2. How do you find amplitude and frequency in FFT?
3. How do you find the frequency range in FFT?
4. Does amplitude affect FFT?

How is amplitude calculated for FFT?

You can compute the single-sided power spectrum by squaring the single-sided rms amplitude spectrum. Conversely, you can compute the amplitude spectrum by taking the square root of the power spectrum.

How do you find amplitude and frequency in 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);

How do you find the frequency range in FFT?

The frequency range of an FFT result depends on the sample rate frequency at which the input data points were evenly sampled. The FFT results are then data points in the frequency domain spaced at the sample rate frequency divided by the FFT length, from 0 or DC up to half the sample rate.

Does amplitude affect FFT?

Such amplitudes can be pretty high and affect FFT results, (with no window function, it can be about 10% of the original values for about 10 neighbor lines). If there is another sine wave in the signal in this region, which is lower than this 10%, it will be completely hidden by the leakage effect.