Music – Instruments
Patent
1975-09-10
1977-11-22
Jackmon, E. S.
Music
Instruments
84 101, 84 122, G10H 106, G10F 100
Patent
active
040590402
ABSTRACT:
A tone source apparatus for an electronic musical instrument is characterized in that at least one cycle of a musical-tone waveform, which it is desired be produced, is depicted as a sequence of section lines and a series of pulses having regular intervals is varied, by a pulse-density varying circuit, in pulse density in accordance with the degrees of inclination of the respective section lines. The resultant series of pulses having varied pulse density is formed, by a waveform forming circuit, into the desired musical tone waveform. The pulse-density varying circuit comprises a first counter to which is applied as an input, the aforementioned series of pulses having regular intervals. A second counter is connected, in series or in parallel, to the first counter and a decoder is connected to an output terminal of the second counter. A memory circuit is connected to the output terminals of the decoder. The memory circuit comprises a plurality of pulse-density setting portions which set frequency-dividing ratios for the first counter for selecting output pulse-densities. The memory circuit also comprises a plurality of section range setting portions which set frequency-dividing ratios for the second counter for selecting output time intervals of signals obtained at respective output terminals of the decoder.
REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3823390 (1974-07-01), Tomisawa
Ezawa Sadaaki
Hashizume Hikaru
Kameyama Seiji
Kondo Tatsunori
Kugisawa Toshio
Jackmon E. S.
Kabushiki Kaisha Kawai Gakki Seisakusho
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