发明名称 |
Tone-source apparatus for electronic musical instrument |
摘要 |
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.
|
申请公布号 |
US4059040(A) |
申请公布日期 |
1977.11.22 |
申请号 |
US19750612174 |
申请日期 |
1975.09.10 |
申请人 |
KABUSHIKI KAISHA KAWAI GAKKI SEISAKUSHO |
发明人 |
OBAYASHI, NOBUHARU;HASHIZUME, HIKARU;SAKASHITA, NORIJI;KAMEYAMA, SEIJI;EZAWA, SADAAKI;KUGISAWA, TOSHIO;WASHIYAMA, YUTAKA;KONDO, TATSUNORI;WATANABE, HIRONORI |
分类号 |
G10H7/00;(IPC1-7):G10H1/06;G10F1/00 |
主分类号 |
G10H7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|