Vertical

Why are there vertical lines in the power spectrum?

Why are there vertical lines in the power spectrum?
  1. What are the vertical lines on a spectrogram?
  2. What is the Fourier transform of a line?

What are the vertical lines on a spectrogram?

The vertical lines are not part of the spectrogram but are present to indicate equal intervals of frequency. Time is indicated at the left side of the plot in local Pacific time and at the right side in Universal (or Greenwich) time.

What is the Fourier transform of a line?

The Fourier transform of a constant sequence is an impulse sequence, so the vertical cross-sections of the Fourier transform are impulses. The impulses all line up each other, resulting in the appearance of a horizontal line.

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