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Mystery Signal of the Month   Mar 10 2006
We've got signal, but what the heck is it?
That's your mission.  Analyze this bébé.
 

mystery spectrogram                                                                                                                                                          

download the audio file 15.wav.bz2

hints :

  • No need to bunzip2 this file since baudline can automatically uncompress bzip2 files.
  • Setup baudline to be a Web Browser helper application as described in the FAQ.
  • Listen to the whole 11 second audio file because there are a number of different clinks, clunks, and dings.  Notice how the cadence changes.
  • Slow down the audio with the Play Deck's speed control and listen for sonic details that would otherwise be missed.
  • Use the Color Aperture window to focus and maximize the color resolution.  An upper -20 dB and lower -110 dB range is a good starting point.
  • Use the Kaiser or Gaussian windows with a high beta value to improve the time resolution in the spectrogram display.
  • Use the periodicity bars to make an accurate time measurement between the clicks.  How constant and repetitive is the mystery signal?



What is it?

Click here for the answer.

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