Optimal looping for wavetable synthesis

Details Optimal looping for wavetable synthesis Optimal looping for wavetable synthesis

1999-09-08

2000-07-04

Donels, Jeffrey

Music

Instruments

Electrical musical tone generation

84607, G10H 700, G11C 700

Patent

active

060841702

ABSTRACT:
In accordance with the present invention, a method and apparatus are provided wherein loop discontinuities are eliminated. In the case of amplitude discontinuities, the harmonic amplitudes contained in the loop are progressively scaled over the duration of the loop, so that for each harmonic the loop end amplitude matches the loop beginning amplitude. In the case of phase discontinuities, the harmonic phases are progressively shifted over the duration of the loop, so that for each harmonic the loop end phase matches the loop beginning phase. Shifting the phase is accomplished by slightly altering the frequency of the harmonics to produce the desired amount of phase-shift at the loop end. In accordance with the present invention, the method also provides a technique to select loop begin and end points to minimize the amount of phase adjustment.

REFERENCES:
patent: 5194681 (1993-03-01), Kudo
patent: 5466882 (1995-11-01), Lee
patent: 5637821 (1997-06-01), Izumisawa et al.

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