Electronic tuner for a musical instrument

Details Electronic tuner for a musical instrument Electronic tuner for a musical instrument

1989-11-27

1991-06-18

Hix, L. T.

Music

Instruments

Stringed

84455, G10D 314, G10G 702

Patent

active

050241320

ABSTRACT:
An electronic tuner generates a pulse train signal from an analog signal transduced from vibrations on a selected one of several strings of a musical instrument. The pulse train signal has a plurality of successive pulses, each of the pulses having a pulse width which may vary between successive pulses. Two of the pulses have a longest pulse width of all pulses in the pulse string are identified. The tuner then computes a current fundamental frequency on the selected string as a function of a ratio between a numerical count of the pulses occurring between these two pulses, the count including one of these pulses, and a sum of the pulse width of each of the pulses included in the count. The two of the pulses have a longest pulse width of all pulses in the pulse string. A difference signal is developed as a function of a difference between the current fundamental frequency and a known in-tune frequency associated with the selected string being tuned. The difference signal may then be used to visually display the difference whereby the selected one of the strings can be tuned to minimize the difference.

REFERENCES:
patent: 4252048 (1981-02-01), Pogoda
patent: 4297938 (1981-11-01), Kirby
patent: 4312044 (1982-01-01), Baba
patent: 4338846 (1982-07-01), Pagoda
patent: 4354418 (1982-10-01), Moravec et al.
patent: 4434697 (1984-03-01), Roses
patent: 4523506 (1985-06-01), Holliman
patent: 4688464 (1987-08-01), Gibson
patent: 4732071 (1988-03-01), Deutsch
patent: 4803908 (1989-02-01), Skinn et al.

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