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:
Mar. 16, 1982
Filed:
Apr. 07, 1981
Hiroshi Kato, Ageo, JP;
Toshio Mishima, Kitamoto, JP;
Kabushiki Kaisha Kawai Gakki Seisakusho, Hamamatsu, JP;
Abstract
A tone source circuit for electronic musical instruments which enables the selection of a desired one of a plurality of waveshapes of different duty ratios and is suitable for fabrication as an integrated circuit. The tone source circuit is composed of a tone signal generator for producing a tone signal of a frequency corresponding to each tone, a frequency divider group for frequency dividing the tone signal to a plurality of stages in a sequential order, a waveshape forming circuit for obtaining a plurality of waveshapes of different duty ratios from output signals of the frequency dividing stages of the frequency divider group and/or a feet select circuit for selecting a plurality of combinations of frequency dividing stages of the frequency divider group, waveshape select means for selecting a desired waveshape from the plurality of waveshapes of different duty ratios and means for selectively deriving a signal of the selected waveshape in response to key depression.