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:
Aug. 07, 1984
Filed:
Aug. 18, 1982
Applicant:
Inventor:
Tsuyoshi Mitarai, Yokohama, JP;
Assignee:
Casio Computer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10H / ;
U.S. Cl.
CPC ...
84-101 ; 307 31 ; 364707 ;
Abstract
A CPU provides control instructions according to key switch information supplied from a keyboard. An LSI receives the control instructions and generates a corresponding digital tone signal, which is converted in an acoustic system into an analog tone signal which is in turn supplied to a loudspeaker for producing sound. A power supply unit can be connected to the LSI and acoustic system through a transistor. The transistor is on-off controlled according to a power-off signal which is provided from the CPU according to a silent state signal generated from a power saving circuit in the LSI.