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, 1983
Filed:
Dec. 15, 1981
Hideaki Ishida, Hachioji, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
First to third switch contact pairs are provided for each of the performance keys of an electronic keyboard musical instrument such that they are successively closed in an interlocked relation to the operation of the associated key. A first time interval from the closure of the first switch contact pair till the closure of the second switch contact pair and a second time interval from the closure of the second switch contact pair till the closure of the third switch contact pair are counted in a CPU, and their ratio is obtained therein. The tone color of the output musical signal is controlled according to the value of this ratio, and the volume of the musical signal is controlled according to the length of the second time interval.