What is baudline?
Mystery Signal
Mystery Signal of the Month   Oct 9 2000
We've got signal, but what the heck is it?
That's your mission.  Analyze this bébé.

mystery spectrogram                                                                                                                                                          

download the audio file 2.wav.gz

hints :

  • Setup baudline to be a Netscape helper application as described in the FAQ.
  • Ignore the 60 Hz AC power leakage and its harmonics (120 Hz, 180 Hz).
  • Turn on the 60 Hz notch filter in the play deck.
  • Try playing the mystery signal at different speeds, slow it down or drop it an octave.
  • Loop on the transitional points, play it again and again until you start to hear things.
  • Measure the harmonic relationships with baudline's harmonic helper bars.  Use this handy tool to determine the fundamentals.
  • Look at the major frequency rise at the start, and the fall near the end.  How are they different?  What is going on?
  • Look for clues in the four blips during the steady state part.  Model that behavior.

What is it?

Click here for the answer.

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