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AssigneeKabushiki Kaisha Kawai Gakki Seisakusho
InventorsNobuharu Obayashi, Hikaru Hashizume, Noriji Sakashita, Seiji Kameyama, Sadaaki Ezawa, Toshio Kugisawa, Yutaka Washiyama, Tatsunori Kondo, Hironori Watanabe
Estimating the term…
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.
A tone-source apparatus for an electronic musical instrument wherein at least one cycle of a musical tone waveform which is to be produced is depicted by a plurality of sections lines, each charaterized by degrees of inclination and length, said apparatus comprising means to generate a series of pulses having regular intervals, pulse-density varying means for varying the pulse-density of the pulses in accordance with the degrees of inclination of respective of the section lines whereby a resultant series of pulses having a varied pulse density is formed, said pulse-density varying means including a memory circuit including a plurality of pulse-density setting portions for selecting pulse densities and a plurality of section range setting portions for selecting output time intervals, and waveform forming means for forming the resultant series into said musical tone waveform.
Dependencies are inferred from the claim text.