Music – Instruments
Patent
1979-10-12
1981-05-05
Witkowski, S. J.
Music
Instruments
84 119, 84DIG9, 364419, 364724, G10H 112, G10H 500
Patent
active
042651581
ABSTRACT:
An elementary digital filter comprising an arithmetic logic unit with associated registers and timing circuits, simulates a current and a voltage in a corresponding elementary analog filter. The frequency response character of this elementary digital filter is changed when a coefficient used in the simulation or the sampling period used as the data renovation cycle of the simulation is changed. A digital filter circuit is composed of such an elementary digital filter or a combination of such elementary digital filters. A time function is passed through this composed digital filter circuit, and the output of the digital filter circuit is converted to an analog voltage to produce a musical tone. The tone quality of the produced musical tone is determined by the original waveform of the time function and the frequency response character of the composed digital filter circuit.
REFERENCES:
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patent: 3809786 (1974-05-01), Deutsch
patent: 3809789 (1974-05-01), Deutsch
patent: 3956960 (1976-05-01), Deutsch
patent: 4000675 (1977-01-01), Futamase et al.
patent: 4114498 (1978-09-01), Chibana et al.
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patent: 4178824 (1979-12-01), Aoki et al.
patent: 4185529 (1980-01-01), Kitagawa
patent: 4192210 (1980-03-01), Deutsch
patent: 4205577 (1980-06-01), Deutsch
patent: 4211138 (1980-07-01), Deutsch
patent: 4214502 (1980-07-01), Holpuch et al.
patent: 4228713 (1980-10-01), Gross
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