Structural contributions to phantom partial generation in the piano
Thomas R. Moore, Lauren M. Neldner, Eric Rokni · The Journal of the Acoustical Society of America · 2018
The results of experiments designed to determine the origin of the anomalous frequency components in the sound of the piano commonly referred to as phantom partials are reported. It is shown that these overtones, which occur at the sum and difference frequencies associated with the transverse string motion, are produced by nonlinearities in both the string and the wooden components of the piano. However, the contribution from the string is significantly smaller than the contributions from other components.