Music – Accessories – Tuning devices
Patent
1975-11-25
1977-08-16
Weldon, Ulysses
Music
Accessories
Tuning devices
324 79R, G10G 702
Patent
active
040418324
ABSTRACT:
A musical instrument tuning aid includes a stable source of reference signals. Those signals are divided by a selected amount to produce a given tone signal. A note produced by an instrument under test or measurement is detected and used to develop a corresponding sensed signal. Variations in phase between successive time increments of the sensed signal desirably are averaged so as to produce a measurement signal. The sensed or measurement signal is compared in frequency with the tone signal for the purpose of producing an indication signal. In response to that comparison, a display indicates whether the instrument is sharp, flat, or on-tune. A signal presence detector may be included for the purpose of disabling the display in the absence of a signal to be tested. Also preferably included is an arrangement for causing the on-tune display to flicker at a rate representative of the nearness to an exact match.
REFERENCES:
patent: 3509454 (1970-04-01), Gossel
patent: 3861266 (1975-01-01), Whitaker
patent: 3879684 (1975-04-01), Sanderson
patent: 3901120 (1975-08-01), Youngquist
Drake Hugh H.
Weldon Ulysses
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