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Structural contributions to phantom partial generation in the piano.

Thomas R Moore1, Lauren M Neldner1, Eric Rokni1

  • 1Department of Physics, Rollins College, Winter Park, Florida, 32789, USA.

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Phantom partials in piano sound originate from nonlinearities in the instrument. Both the piano string and wooden parts contribute, but the wood

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Area of Science:

  • Acoustics and Musical Instrument Physics

Background:

  • Piano sound exhibits anomalous frequency components known as phantom partials.
  • These partials are related to the complex vibrational modes of the instrument.

Purpose of the Study:

  • To investigate the origin of phantom partials in piano acoustics.
  • To identify the specific components responsible for generating these anomalous frequencies.

Main Methods:

  • Experimental analysis of piano sound.
  • Measurement of frequency components related to transverse string motion.
  • Assessment of nonlinearities in piano components.

Main Results:

  • Phantom partials arise from nonlinearities in both the piano string and wooden components.
  • The wooden components contribute significantly more to phantom partials than the string itself.
  • Observed overtones occur at sum and difference frequencies of string motion.

Conclusions:

  • Nonlinearities in the piano's construction are the primary source of phantom partials.
  • Understanding these nonlinearities is crucial for piano sound synthesis and analysis.
  • The study elucidates the physical mechanisms behind complex piano sound characteristics.