Fft resolution bandwidth

1. What is the resolution of the FFT?
2. What is FFT bandwidth?
3. How is FFT resolution calculated?
4. How is FFT bandwidth calculated?

What is the resolution of the FFT?

Frequency resolution is 10 Hz. The time waveform with length of 0.1 seconds is used for an FFT analysis. The spectrum values are obtained by performing FFT every 10 Hz. The spectrum cannot be obtained with the fractional frequency component values, such as 995, 1001 Hz.

What is FFT bandwidth?

The bandwidth of the FFT is divided into bins, the number of which is 1/2 the FFT length. The bin width (also called line spacing) defines the frequency resolution of the FFT. The FFT provides amplitude and phase values for each bin. The bin width is stated in hertz.

How is FFT resolution calculated?

The frequency resolution is equal to the sampling frequency divided by FFT size. For example, an FFT of size 256 of a signal sampled at 8000Hz will have a frequency resolution of 31.25Hz. If the signal is a sine wave of 110 Hz, the ideal FFT would show a sharp peak at 110Hz.

How is FFT bandwidth calculated?

To calculate the measurement bandwidth for a given sampling frequency, multiply the sampling frequency by 0.464 for the ±0.1 dB flatness. Also, the larger the FFT, the larger the number of frequency lines.