Music – Accessories – Tuning devices
Patent
1975-02-18
1976-04-27
Hix, L. T.
Music
Accessories
Tuning devices
84 101, 84DIG18, 324 79D, G10G 702, G01R 2314
Patent
active
039526259
ABSTRACT:
An Electronic Tuning Device for tuning musical instruments employes a single radio frequency oscillator. Frequency dividers are used to divide the frequency of the radio frequency oscillator (clock) by various divisors so as to produce a series of notes that approximate a desired musical scale. A note selector selects a particular note for use as a reference frequency against which a musical instrument to be tuned can be compared. The note selector also controls means for shifting the frequency of the master oscillator slightly so as to place the frequency of the selected note exactly at its proper position in the desired musical scale. A vernier control is provided by means of which the master oscillator can be altered so as to cause all of the notes to be sharped and flated up to about a half semitone. The generated note, or a sub octave of same, can be used for direct audible comparison with an instrument to be tuned or the selected tone can be divided to a low frequency and used as a frequency reference for deriving a voltage to drive a synchronous motor which is in turn used to drive a stroboscopic disc. In this mode of operation an audio amplifier picks up a signal from the instrument to be tuned and causes a lamp to flash at the frequency that the instrument is sounding, and when the instrument is in exact tune with the selected note, the tone wheel will appear to be standing still.
REFERENCES:
patent: 2584277 (1952-02-01), Long
patent: 2806953 (1957-09-01), Krauss
patent: 3509454 (1970-04-01), Gossel
patent: 3861266 (1975-01-01), Whitaker
patent: 3879684 (1975-04-01), Sanderson
Hix L. T,.
Witkowski Stanley J.
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