Concentric

Meaning of concentric circles on the spectrogram

Meaning of concentric circles on the spectrogram
  1. What are 3 concentric circles?
  2. What is the relationship between a spectrogram and Fourier transform?

What are 3 concentric circles?

The Three Concentric Circles Model represents the spread of the English language in terms of three concentric circles: the Inner Circle, the Outer Circle and the Expanding Circle (Kachru, 1985).

What is the relationship between a spectrogram and Fourier transform?

To generate a spectrogram, a time-domain signal is divided into shorter segments of equal length. Then, the fast Fourier transform (FFT) is applied to each segment. The spectrogram is a plot of the spectrum on each segment.

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