Semi-Live Image (IR)

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Wednesday 30 June 2010

Spectrograms...

Some of you may recall that I looked into the frequencies of the Great Tit, Blue Tit and of the Eurasian Tree Sparrow. Here below is the spectrogram of the Eurasian Tree Sparrow (click to enlarge!)...



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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