Shepard's tones (spectrogram and video)

The spectrogram of Shepard's tones reveals the interlacing of rising tones, with an octave shift down (indicated by yellow arrows).  A perfect example of a group theoretic idea (that pitch classes -- pitches separated by octaves -- are members of the "clock time" group Z_12).

Play video:  AVI   RAR   MPEG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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