A polyphonic acoustic vortex and its complementary chords

Details A polyphonic acoustic vortex and its complementary chords A polyphonic acoustic vortex and its complementary chords

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12b3018w&link_type=abstract

New Journal of Physics, Volume 12, Issue 2, pp. 023018 (2010).

Physics

1

Scientific paper

Using an annular phased array of eight loudspeakers, we generate sound beams that simultaneously contain phase singularities at a number of different frequencies. These frequencies correspond to different musical notes and the singularities can be set to overlap along the beam axis, creating a polyphonic acoustic vortex. Perturbing the drive amplitudes of the speakers means that the singularities no longer overlap, each note being nulled at a slightly different lateral position, where the volume of the other notes is now nonzero. The remaining notes form a tri-note chord. We contrast this acoustic phenomenon to the optical case where the perturbation of a white light vortex leads to a spectral spatial distribution.

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