Digital tone generation system utilizing fixed width window...

Details Digital tone generation system utilizing fixed width window... Digital tone generation system utilizing fixed width window...

G - Physics

10

H

84/1.1

G10H 1/00 (2006.01) G10H 7/08 (2006.01)

Patent

CA 1160872

ABSTRACT A tone generation system intended primarily for use in electronic musical instruments wherein a digital representation of a harmonically rich waveform is sampled, and a musical tone is produced therefrom. The stored waveform could be the four-term Blackman-Harris window function, which has negligible sidelobes and thus greatly attenuated higher harmonics. The stored function is read out at a fixed rate, but the time periods between successive readings of the waveform are varied to thereby vary the frequency of the output signal. Harmonic content is varied by adjusting the amplitudes of successive wave- forms in the waveform train, which has the resultant effect of producing harmonics of selectable amplitudes.

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