Music – Instruments
Patent
1978-07-07
1987-02-17
Witkowski, S. J.
Music
Instruments
84 122, 84 124, G10H 108, G10H 700
Patent
active
046430660
ABSTRACT:
An electronic musical instrument capable of producing, by frequency modulation, a musical tone containing harmonic components of integer and non-integer orders at complicated ratios which change with time. In frequency modulation, amplitudes of carrier and side frequencies are preceded by a positive or negative sign depending upon a value of modulation index. By suitably setting the value of modulation index, phase inversion occurs in the side frequencies so that cancellation or augmentation of amplitude will occur between side frequencies of the same frequency. By utilizing this phenomenon and also the fact that the harmonic spectrum can be varied by varying the carrier and the modulating waves, the electronic musical instrument according to the invention produces a musical tone containing extremely complex harmonic components.
An embodiment of the invention is disclosed in which a single sinusoidal carrier is frequency modulated by a single sinusoidal modulating wave to provide the frequency modulated wave as a musical tone signal. In this embodiment, the phase component of the carrier wave, phase component of the modulating wave, modulation index and amplitude coefficient are all time-variant values. In another embodiment of the invention, a single sinusoidal carrier is frequency modulated by two sinusoidal modulating waves. Other examples are also disclosed in which function waveforms other than a sine wave and containing harmonics are used as the carrier and modulating waves.
REFERENCES:
patent: 3515039 (1970-06-01), Omura et al.
patent: 3534144 (1970-10-01), Ring
patent: 3794748 (1974-02-01), Deutsch
patent: 3882751 (1975-05-01), Tomisawa et al.
patent: 3979991 (1976-09-01), Kawamoto
patent: 4018121 (1977-04-01), Chowning
patent: 4082027 (1978-04-01), Hiyoshi et al.
B. P. Lathi, Communication Systems, Copyright .COPYRGT.1968 by John Wiley & Sons, Inc., pp. 216-227.
Thomas Wells et al., The Technique of Electronic Music, Sterling Swift Publishing Company, P.O. Box 1352, Austin, Texas, 78767, Copyright 1974, pp. 96-104.
Nippon Gakki Seizo Kabushiki Kaisha
Witkowski S. J.
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