Electronic musical instrument of a formant synthesis type

Details Electronic musical instrument of a formant synthesis type Electronic musical instrument of a formant synthesis type

1981-09-10

1983-12-27

Witkowski, S. J.

Music

Instruments

84 12, 84 122, 84 124, G10H 106, G10H 700

Patent

active

044223625

ABSTRACT:
A musical tone is synthesized by frequency modulation which realizes a desired fixed formant. A first accumulator repeatedly adds a constant corresponding to a center frequency of the fixed formant at a regular time interval to generate phase angle data of a carrier. A second accumulator repeatedly adds a constant corresponding to a fundamental frequency of a selected note at a regular time interval to output a carry out signal each time the accumulated value has exceeded a predetermined modulo number. By resetting the first accumulator repeatedly by this carry out signal, the phase angle data of the carrier is brought into a harmonic relation with the fundamental frequency. By effecting frequency modulation using this phase angle data of the carrier and the fundamental or harmonic frequency of a selected note, a musical tone in which harmonic components of the selected note are controlled in accordance with the desired fixed formant is synthesized. A third accumulator repeatedly adds a constant corresponding to a modulating frequency peculiar to the desired fixed formant at a regular time interval. Contents of the third accumulator are repeatedly reset by a carry out signal from the second accumulator. As a result, the output of the third accumulator is brought into a harmonic relation with the selected note and therefore is suitable for use as phase angle data of a modulating frequency in the frequency modulation.

REFERENCES:
patent: 4018121 (1977-04-01), Chowning
patent: 4135422 (1979-01-01), Chibana
patent: 4253367 (1981-03-01), Hiyoshi et al.
patent: 4301704 (1981-11-01), Nagai et al.

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