Real time digital additive synthesizer

Details Real time digital additive synthesizer Real time digital additive synthesizer

1988-11-25

1990-03-20

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84659, G01H 108, G01H 700

Patent

active

049091182

ABSTRACT:
A digital synthesizer includes an input transducer for accepting input signals from a musician representing at least the desired fundamental pitch and timbre. The synthesizer has timbre storing circuitry for storing data representing a plurality of selectable timbres, including relative pitch data for a plurality of sets of partials and a plurality of sets of amplitude data, the partials and the amplitudes being independently selectable. Waveform determining circuitry determines sequential values of the musical waveform in real time from the timbre data, from the timbre selected by the musician, and from the pitch selected by the musician. The waveform determining circuitry includes a first adder for additively determining the phase of each partial of the selected timbre and is responsive to the relative partial pitch data to determine that phase. It also includes a second adder for summing the magnitudes of all the partials for the selected timbre at each predetermined time interval to generate the magnitude of the musical waveform at that instant.

REFERENCES:
patent: 3908504 (1975-09-01), Deutsch
patent: 4150600 (1979-04-01), Deutsch
patent: 4300432 (1981-11-01), Deutsch
patent: 4300434 (1981-11-01), Deutsch
patent: 4471681 (1984-09-01), Nishimoto
patent: 4638709 (1987-01-01), Nagashima et al.
patent: 4700603 (1987-10-01), Takauji et al.
patent: 4735123 (1988-04-01), Deutsch
patent: 4800794 (1989-01-01), Deutsch

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