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ship spectrogramClick on spectrogram for full-sized image.

809K wav file(The recorded signal has been sped up 10 times) 

  Unidentified ship sound  

A banded spectrogram is indicative of the sound produces by a ship's screw. The location of the frequency bands and other characteristics of the sound can be used to infer the style of ship. This spectrogram probably represents a relatively small vessel moving at high speed.