Electronic musical instrument having plural different tone gener

Details Electronic musical instrument having plural different tone gener Electronic musical instrument having plural different tone gener

1990-01-03

1992-03-10

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84624, 84627, G10H 1057, G10H 114, G10H 702

Patent

active

050941364

ABSTRACT:
Two tone generators having different tone generation systems, e.g., PCM type and FM type, are provided. There are tone generation modes designating combination of tone generation in these tone generators and one can be selected from among them. There are, for example, a simple mixing mode, a delay mode in which start of tone generation in one tone generator is delayed from that in the other and a crossfade mode in which a tone signal is generated first in one tone generator and tone generation is switched to the other tone generator and envelope levels of output tone signals of the two tone generators are crossfaded during a switching period. Delay time in the delay mode and switching time in the crossfade mode can be variably controlled in accordance with a key scaling and/or other factors. A tone may be generated at a sampling frequency synchronized with a pitch in one tone generator and at a sampling frequency which is not synchronized with the pitch in the other tone generator. A phase of one cycle may be divided into plural sections and a complex waveform can be generated by converting the phase address signal in accordance with a function peculiar to each phase section and accessing a waveform memory with the converted address signal.

REFERENCES:
patent: 4389915 (1983-06-01), Bione
patent: 4395931 (1983-08-01), Wachi
patent: 4726276 (1988-02-01), Katoh et al.
patent: 4766795 (1988-08-01), Takeuchi
patent: 4909121 (1990-03-01), Usa et al.

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