Music – Instruments
Patent
1980-05-30
1981-12-29
Witkowski, Stanley J.
Music
Instruments
84 119, 84DIG2, 84DIG10, G10H 100, G10H 500
Patent
active
RE0308340
ABSTRACT:
The musical instrument is of a waveform memory device read out type and comprises a frequency information generator for generating a plurality of sets of frequency informations each set consisting of a subplurality of frequency informations and corresponding to each of the tone pitches of the depressed keys in a keyboard, a selector for selecting one, at a time and one after another, of the subplurality of frequency informations generated by the frequency information generator for each one key depressed, an accumulator for repeatedly accumulating the frequency information selected by the selector to produce an increasing accumulated value, a waveform memory device for storing the amplitude values at successive sampling points in one period of a sine wave utilized to form a desired musical waveform, a comparator for comparing the accumulated value with a preset value and controlling the selecting operation of the selector during the operation of the accumulator. The increasing accumulated value is used to address the waveform memory device to read out therefrom amplitude samples to form a desired musical tone wave form. The output of the waveform memory means is imparted with a volume envelope generated by an envelope waveform generator and then produced as a performance tone by a sound system.
REFERENCES:
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patent: 4130043 (1978-12-01), Niimi
patent: 4132140 (1979-01-01), Chibana
patent: 4138915 (1979-02-01), Nagai et al.
Kato Mitsumi
Niimi Koji
Nippon Gakki Seizo Kabushiki Kaisha
Witkowski Stanley J.
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