Electronic musical instrument of fixed formant synthesis type

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

1981-08-25

1983-09-27

Isen, F. W.

Music

Instruments

84 101, G10H 102

Patent

active

044062044

ABSTRACT:
A musical tone is synthesized by controlling harmonic components of a note selected in a keyboard in accordance with a desired fixed formant. A parameter computation circuit detects a harmonic frequency which is nearest to a center frequency of the fixed formant and produces FM computation parameters using the nearest harmonic frequency as a carrier frequency and a fundamental or harmonic frequency of the selected note as a modulating frequency. A frequency modulation circuit performs an FM computation on the basis of these parameters and, as a result, a tone whose harmonic components have been controlled in accordance with a formant having the nearest harmonic frequency as a central component is synthesized. The parameter computation circuit computes frequency difference between the nearest harmonic frequency and the center frequency of the fixed formant for controlling the level of a formant synthesized in a frequency modulation circuit in accordance with this frequency difference. This level control is achieved by controlling an amplitude coefficient of a tone or a modulation index in the FM computation. A subformant having as its central component another harmonic frequency in the vicinity of the nearest harmonic frequency may be formed in a relatively low level for reinforcing the formant with this subformant.

REFERENCES:
patent: 3809786 (1974-05-01), Deutsch
patent: 4018121 (1977-04-01), Chowning
patent: 4192210 (1980-03-01), Deutsch
patent: 4211138 (1980-07-01), Deutsch
patent: 4267761 (1981-05-01), Deutsch
patent: 4300434 (1981-11-01), Deutsch

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