Musical sound generating system including pseudo-sinusoidal wave operator
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United States of America Patent
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May 26, 1998
Issued Date -
N/A
app pub date -
Apr 25, 1997
filing date -
Jul 28, 1994
priority date (Note) -
Expired
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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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