Stft

Normalize STFT output by magnitude

Normalize STFT output by magnitude
  1. What is the magnitude of STFT?
  2. How is STFT calculated?
  3. What is the size of short time Fourier transform window?

What is the magnitude of STFT?

STFT magnitude, specified as a matrix. s must correspond to a single-channel, real-valued signal. Example: abs ( stft ( sin (pi/2*(0:255)),'FFTLength',128)) specifies the STFT magnitude of a sinusoid. Example: abs ( stft ( chirp (0:1/1e3:1,25,1,50))) specifies the STFT magnitude of a chirp sampled at 1 kHz.

How is STFT calculated?

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 the size of short time Fourier transform window?

For computing the STFT, we use a Hann as well as a rectangular window each having a size of 62.5 msec.

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