Music – Instruments
Patent
1984-08-23
1987-04-07
Witkowski, Stanley J.
Music
Instruments
84 122, 84DIG10, G10H 108, G10H 114
Patent
active
046551158
ABSTRACT:
In a musical tone synthesizer in which an amplitude-modulated carrier wave delivered from an amplitude modulator is used to form a musical tone signal, the amplitude-modulated carrier wave is fed back to the input side of the amplitude modulator as a modulation signal, a portion thereof, a portion of a carrier wave or a composite signal of the modulation signal and the carrier wave. The amount of feedback may be controlled by multiplying the amplitude-modulated carrier wave with a predetermined modulation index. Furthermore, the modulation index may be charged with time so that the control of spectrum construction of the musical tone signal is readily performed. According to a modified embodiment, a plurality of amplitude-modulators are provided which are connected in a ring form feedback loop in which the modulated outputs of preceding amplitude modulators are supplied respectively to succeeding amplitude modulators.
REFERENCES:
patent: 2221188 (1940-11-01), Hammond et al.
patent: 3007361 (1961-11-01), Wayne, Jr.
patent: 3157725 (1964-11-01), Wayne, Jr.
patent: 4114498 (1978-09-01), Chibana et al.
patent: 4135424 (1979-01-01), Okamoto
patent: 4189972 (1980-02-01), Yamada et al.
patent: 4281574 (1981-08-01), Deutsch
Nippon Gakki Seizo Kabushiki Kaisha
Witkowski Stanley J.
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