Howtosignalprocessing
What is STFT spectrogram?
s = spectrogram( x ) returns the Short-Time Fourier Transform (STFT) of the input signal x . Each column of s contains an estimate of the short-term, time-localized frequency content of x . The magnitude squared of s is known as the spectrogram time-frequency representation of x [1].
What is STFT in Matlab?
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.
Why do we use STFT?
STFT is widely used in audio feature extraction for time-frequency decomposition. This can be observed from the signatures in Tables V–VII. However, STFT provides only a suboptimal tradeoff between time and frequency resolution since the frequency resolution of the STFT is the same for all locations in the spectrogram.
