Time resolution of the Short Time Fourier Transform (STFT)

1. How do you calculate short-time Fourier transform?
2. What is FFT length in STFT?
3. What does short-time Fourier transform do?
4. How is STFT different from FFT?

How do you calculate short-time Fourier transform?

In practice, the procedure for computing STFTs is to divide a longer time signal into shorter segments of equal length and then compute the Fourier transform separately on each shorter segment. This reveals the Fourier spectrum on each shorter segment.

What is FFT length in STFT?

512 (default) | positive integer. FFT length, specified as a positive integer. This property determines the length of the STFT output (number of rows).

What does short-time Fourier transform do?

The short-time Fourier transform (STFT) is used to analyze how the frequency content of a nonstationary signal changes over time. The magnitude squared of the STFT is known as the spectrogram time-frequency representation of the signal.

How is STFT different from FFT?

If you look closely, there is a difference in the time frame on 3D graphs between STFT and FFT. STFT has smaller time frames, consequently, the frequency spectrum moves smoother over time, therefore it is more accurate. Block size - defines the number of real data samples to be taken for the calculating FFT.