Music – Instruments – Electrical musical tone generation
Patent
1995-11-01
1998-09-29
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84609, 84622, 84626, G10H 700, G10H 702
Patent
active
058147519
ABSTRACT:
A musical tone generating apparatus is capable of reproducing natural musical tones while waveform memories of a nominal capacity. The apparatus comprises a first waveform memory 1a for storing first waveform data of one period of a stationary first waveform existing after an elapse of a certain period from the beginning of generation of a musical tone and a second waveform memory 1b for storing second waveform data of one period of a second waveform representing differential spectral components derived from spectral differences between a fundamental wave component and harmonic components of the non-stationary waveform determined immediately after the beginning of generation of the musical tone and a fundamental wave component and harmonic components of the first waveform. A first multiplier generates first multiplication data by multiplying the first waveform data with a first level coefficient which varies as a function of time and a second multiplier generates second multiplication data by multiplying the second waveform data with a second level coefficient which varies as a function of time. A level coefficient generator provides the first level coefficient and the second level coefficient while an adder sums the first multiplication data and the second multiplication data.
REFERENCES:
patent: 3823390 (1974-07-01), Tomisawa et al.
patent: 4224856 (1980-09-01), Ando et al.
patent: 4679480 (1987-07-01), Suzuki
patent: 4754679 (1988-07-01), Suzuki
Fletcher Marlon T.
Seikosha Co. Ltd.
Shoop Jr. William M.
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