Tuning device for musical instruments

Details Tuning device for musical instruments Tuning device for musical instruments

1978-04-17

1980-06-03

Hix, L. T.

Music

Accessories

Tuning devices

84DIG18, 324 79D, G10G 702

Patent

active

042055849

ABSTRACT:
A tuning device for musical instruments, which includes: harmonic filters for the prevention of zero transits of the tone frequency voltage extraneous to the fundamental tone oscillation or to the second or fourth harmonic, a Schmitt-trigger for the conversion of the filtered tone frequency voltage into a digital oscillation, an oscillation counter with decoder and display means to the input of which the digital oscillation signal together with the reference period signal is fed via an AND-gate and which is reset by the signal for lacking amplitude of the tone frequency voltage, a reference frequency source, a reference period generator, triggering means for triggering the reference period generator, a flip-flop for the generation of an oscillation period signal, and a synchronizing device for synchronizing the beginning of the counting period with the reference frequency voltage.

REFERENCES:
patent: 3144802 (1964-08-01), Faber
patent: 3948140 (1976-04-01), Ichioka

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