Method and apparatus for tuning musical instruments

Details Method and apparatus for tuning musical instruments Method and apparatus for tuning musical instruments

G - Physics

01

R

324/38

G01R 23/02 (2006.01)

Patent

CA 1081786

A B S T R A C T A musical tuning aid. The tuning aid generates a digital pulse train at the frequency of a selected harmonic of a note being sounded and combines this pulse train and a four-phase digital clock output having a reference frequency to produce four phase signals which low-pass filters con- vert to dc output signals. Each output signal indicates the instantaneous phase difference between the note and a respective one of the clocking signals. Each dc output signal controls the light from a pair of lamps. Individual lamps in each pair are diametrically opposed on a circle with all the pairs being equiangularly spaced. The lamps pairs reach maximum brightness in sequence, providing the illusion of a rotating light bar. The direction of rotation indicates whether the note being tuned is flat or sharp and the speed of rotation is proportional to the frequency deviation from the reference.

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