The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 1977
Filed:
Sep. 10, 1975
Nobuharu Obayashi, Hamamatsu, JA;
Hikaru Hashizume, Hamamatsu, JA;
Noriji Sakashita, Hamamatsu, JA;
Seiji Kameyama, Hamamatsu, JA;
Sadaaki Ezawa, Hamamatsu, JA;
Toshio Kugisawa, Hamamatsu, JA;
Yutaka Washiyama, Hamamatsu, JA;
Tatsunori Kondo, Hamamatsu, JA;
Hironori Watanabe, Hamamatsu, JA;
Kabushiki Kaisha Kawai Gakki Seisakusho, Hamamatsu, JA;
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.