Electronic musical instrument with frequency modulation of a ton

Music – Instruments

Patent

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84 124, 84DIG8, G10H 104, G10H 500

Patent

active

041731646

ABSTRACT:
An electronic musical instrument comprises first and second voltage-controlled frequency-variable oscillators responsive to application of a pitch determining voltage signal from a keyboard circuit to produce first and second audible frequency signals, respectively. The second audible frequency signal is coupled to the first voltage-controlled oscillator to produce a frequency-modulated tone signal to be sounded in which the first audible frequency signal is frequency-modulated with the second audible frequency signal. The content of harmonic components in a musical tone can be increased by sideband components resulting from frequency modulation. The second audible frequency signal may be amplitude-controlled to be proportional, in amplitude, to the magnitude of pitch determining voltage signal, amplitude-modulated with a time-varying control waveform, and/or waveform-modified to provide desirable modulation effects. The mixture of the pitch determining voltage signal and the second audible frequency signal may be coupled to the first voltage-controlled oscillator through an absolute value circuit. The second audible frequency signal may be also coupled to a sound system together with the frequency-modulated tone signal.

REFERENCES:
patent: 3716647 (1973-02-01), Kameoka et al.
patent: 3794748 (1974-02-01), Deutsch
patent: 3847050 (1974-11-01), Freeman
patent: 3882751 (1975-05-01), Tomisawa et al.
patent: 3886836 (1975-06-01), Hiyoshi
patent: 3956961 (1976-05-01), Peterson
patent: 4018121 (1977-04-01), Chowning

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