Frequency detecting apparatus

Details Frequency detecting apparatus Frequency detecting apparatus

1977-10-11

1980-10-14

Hix, L. T.

Music

Accessories

Tuning devices

321 79D, G10G 702

Patent

active

042274370

ABSTRACT:
A detecting apparatus for tuning musical instruments receives an input signal from a sound transducer and removes second harmonic content therefrom by means of a filter responsive to a note and octave selection. A phase lock pulse generator receives the filtered output and generates a signal in step with the input sound signal. The generated signal is counted by a note counter during a gating period derived by counting a predetermined number of output cycles of an oscillator started in step with the input signal. Three outputs indicating "on-frequency", "sharp" or "flat" are supplied in the alternative at the end of the gating period in accordance with the count in the note counter at that time.

REFERENCES:
patent: 3144802 (1964-08-01), Faber
patent: 3766818 (1973-10-01), Prohofsky
patent: 4014242 (1977-03-01), Sanderson
patent: 4120229 (1978-10-01), Ota

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