Music – Instruments
Patent
1975-06-02
1976-05-18
Hix, L. T.
Music
Instruments
84DIG4, 84DIG10, 331 25, 331 47, G10H 102, G10H 506
Patent
active
039569616
ABSTRACT:
For use in an electronic musical instrument, such as an electronic organ, a first set of tone generators, preferably of the type where all of the notes of a musical scale are obtained by frequency division from a single frequency stable master oscillator, operates together with a second set of tone generators comprised of a plurality of individually tunable chorus oscillators for generating the notes of a musical scale in a frequency range where the sensitivity of the human ear to ensemble or chorus effect is appreciable. The chorus oscillators are individually adjusted to beat with and produce chorus effects with corresponding notes derived from the first set. In addition, the entire set of chorus oscillators is capable of being simultaneously and proportionally raised or lowered in pitch by applying a control voltage to a frequency control terminal. The effect of environmental changes, such as in temperature and humidity, on the pitch of the chorus oscillators is substantially eliminated by phase comparing the signal from a selected chorus oscillator with a selected signal from the first set of tone generators which has a frequency integrally related to the frequency of selected chorus oscillator tone, and deriving a voltage proportional to the phase comparison. This voltage is applied to the voltage control terminal of each of the chorus oscillators to simultaneously and proportionally adjust their output frequencies by an amount necessary to cause the selected tone to lock in frequency with the selected tone from the first set of tone generators. Adjustment of the tuning of the single master oscillator of the first set of tone generators results in a simultaneous raising or lowering of the pitch of all of the notes of the second set of chorus oscillators.
REFERENCES:
patent: 3361986 (1968-01-01), Catania
patent: 3397364 (1968-08-01), Crandall
patent: 3611175 (1971-10-01), Boelke
patent: 3792478 (1974-02-01), Parquier et al.
patent: 3800060 (1974-03-01), Hallman, Jr.
patent: 3828109 (1974-08-01), Morez
patent: 3828271 (1974-08-01), Schwanauer
Hix L. T,.
Olson Spencer E.
Witkowski Stanley J.
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