Music – Accessories – Tuning devices
Patent
1974-10-03
1976-07-13
Weldon, Ulysses
Music
Accessories
Tuning devices
324 79R, G10G 702
Patent
active
039687198
ABSTRACT:
A method for tuning a piano or other instrument. A characteristic stretch is measured using a tuning instrument which compares an internally generated reference signal and the corresponding partial of a note from the instrument and indicates the instantaneous phase difference between the two. A reference note in the instrument (e.g., the 440 Hz "A") is tuned to a standard frequency for the scale. Then, using the characteristic stretch, the deviation from a reference scale frequency for each successive note is determined and each note is tuned to a frequency which is the sum of the reference scale frequency and corresponding deviation for that note. In one particular embodiment, the stretch correction, Y(n,N), in cents is based upon the following:
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patent: 3509454 (1970-04-28), Gossel
patent: 3631756 (1972-01-01), Mackworth-Young
patent: 3696293 (1972-10-01), Hoffman et al.
patent: 3722353 (1971-06-01), Westhaver
patent: 3766818 (1973-10-01), Prohofsky
O. L. Railsback, "A Chromatic Stroboscope," J.A.S.A., pp. 37-42, vol. 9.
R. W. Young, "Inharmonicity of Pain Wire Piano Strings," J.A.S.A., pp. 267-273, vol. 24.
D. W. Martin et al., "Subjective Evaluation of Musical Scale Temperament in Pianos," J.A.S.A., pp. 582-585.
A. C. Van Der Woerd, "New Electronic Tuning Device for Pianos," pp. 2010-2017, J.A.S.A., vol. 51.
Inventronics, Inc.
Weldon Ulysses
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