Musical sound generating system including pseudo-sinusoidal wave

Details Musical sound generating system including pseudo-sinusoidal wave Musical sound generating system including pseudo-sinusoidal wave

1997-04-25

1998-05-26

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84696, 84697, 84DIG10, G10H 108, G10H 502

Patent

active

057569193

ABSTRACT:
A musical sound generating system not requiring a memory unit or interpolation device for generating a tone having a tone color including a large number of harmonic components. The tone is generated with few operations and ready predictability of tone color. The musical sound generating system includes an adder for phase modulating a carrier wave by adding modulating wave data to carrier wave phase angle data; a pseudo-sinusoidal wave operator for outputting a pseudo-sinusoidal wave in response to phase-modulated carrier wave phase angle data from the adder; and a multiplier for generating a tone signal by multiplying the pseudo-sinusoidal wave by amplitude coefficient data. The pseudo-sinusoidal wave operator controls modulation of the pseudo-sinusoidal wave in accordance with a function modulation coefficient that is supplied to the operator as an external parameter. The pseudo-sinusoidal wave operator may include an operator for generating a triangular wave, an operator for squaring the triangular wave, and an operator for producing a substantially sinusoidal wave from a combination of the triangular wave and the squared triangular wave.

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patent: 4643066 (1987-02-01), Oya
patent: 4813326 (1989-03-01), Hirano et al.
patent: 5164530 (1992-11-01), Iwase

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