Quantitative method for evaluation of the state of piano hammer

Details Quantitative method for evaluation of the state of piano hammer Quantitative method for evaluation of the state of piano hammer

1992-10-05

1995-06-13

Gellner, Michael L.

Music

Accessories

Tuning devices

84DIG18, 73 82, G10G 702, G01N 348

Patent

active

054232414

ABSTRACT:
A method for measuring dynamic hardness of elastic materials is applied particularly to determining the state of tonal quality for a piano hammer. The method includes selecting a piano hammer of predetermined type from a set of piano hammers, causing the selected piano hammer to strike against an impact surface having the form of a piano string or string grouping appropriate to a piano hammer of the predetermined type, measuring one or more elements of force and motion of the piano hammer striking the impact surface, e.g. force, determining, e.g., the cut-off frequency of the power spectrum for the selected piano hammer striking upon the impact surface, and comparing the determined cut-off frequency of the power spectrum for the selected piano hammer against a predetermined range of cut-off frequencies of power spectrum acceptable for piano hammer of the predetermined type. An apparatus for testing is also described.

REFERENCES:
patent: 465505 (1891-12-01), Weser
patent: 4080863 (1978-03-01), Groeschel
patent: 5079728 (1992-01-01), Adams et al.

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