The upper image shows the wave form. The lower images indicates which frequencies were associated with the greatest intensities and their evolution over time (y-axis: frequency, x-axis: time, colour map: intensity with blue = max intensity, yellow = min low intensity) ....so the bird sang at mostly only one frequency.
Now compare to the images below...this is the "voice" of another animal...intensities are spread over a wider range of frequencies and the frequencies at which this animal expresses itself decrease with time (again: click to enlarge!)...
any guesses?
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