Music – Instruments
Patent
1985-04-05
1986-09-16
Adams, Russell E.
Music
Instruments
84 119, G10H 100, G06F 102
Patent
active
046115226
ABSTRACT:
A tone wave synthesizing apparatus comprises a phase address generator; a time frame generator; an elementary wave generator; an incremental wave generator; and an adder. The phase address generator generates a phase address signal which designates phase addresses for phase angles of a waveform to be produced progressively and repetitively. The time frame generator generates a time frame signal which sequentially designates a series of time frames one after another. The elementary wave generator repeatedly generates, for each designated time frame, a period of elementary tone wave in the form of a series of wave sample values in accordance with the phase address signal, which elementary tone wave represents a tone wave at a beginning of the designated time frame. The incremental wave generator generates progressively changing incremental waves each in the form of a series of wave sample values in accordance with the phase address signal, which progressively changing incremental waves exhibit successive changes of waveform from one period to another by an amount predetermined for the designated time frame. The adder adds, in each time frame of the successive time frames, the elementary tone wave and the progressively changing incremental waves from one period to another. Thus a tone wave which changes its form with the lapse of time is synthesized by means of a small sized waveform generators.
REFERENCES:
patent: 4471681 (1984-09-01), Nishimoto
patent: 4483229 (1984-11-01), Tsukamoto et al.
patent: 4498364 (1985-02-01), Ezawa
patent: 4536853 (1985-08-01), Kawamoto et al.
patent: 4539884 (1985-09-01), Aoki
Adams Russell E.
Nippon Gakki Seizo Kabushiki Kaisha
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