Music – Instruments
Patent
1979-04-09
1981-02-10
Witkowski, S. J.
Music
Instruments
G10H 108
Patent
active
042494486
ABSTRACT:
In a musical instrument having one or more tone generators in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced reference points defining the waveform of one cycle of an audio signal are transferred sequentially from a note register to a digital-to-analog converter in repetitive cycles at a rate proportional to the pitch of the tone being generated, apparatus is provided for computing the set of data points in the note register from a set of points defining a quarter cycle of the waveform. The calculation of the quarter cycle of data points is divided into two sets. One set is calculated using the odd-numbered harmonics and the other set is caculated using the even-numbered harmonics. The complete waveform is reconstructed from the two sets during the transfer of data to the note registers. By reducing the number of calculated points to one-quarter of a waveform the calculation time is reduced thereby making the instrument capable of faster response to time varying tonal changes.
REFERENCES:
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 3809788 (1974-05-01), Deutsch
patent: 4022098 (1977-05-01), Deutsch et al.
patent: 4067254 (1978-01-01), Deutsch et al.
patent: 4085644 (1978-04-01), Deutsch et al.
Deutsch Leslie J.
Deutsch Ralph
Deutsch Ralph
Kawai Musical Instrument Mfg. Co. Ltd.
Witkowski S. J.
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