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:
Jun. 25, 1991
Filed:
Nov. 21, 1989
Applicant:
Inventor:
Akiyoshi Oya, Hamamatsu, JP;
Assignee:
Yamaha Corporation, Hamamatsu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10H / ;
U.S. Cl.
CPC ...
84659 ; 84696 ;
Abstract
In this electronic musical instrument a musical tone is generated by frequency modulation employing a carrier wave and a modulating wave. Plural tone production channels are employed and a key assigner assigns production of a tone corresponding to a depressed key to an available channel. Tone production is achieved by a frequency modulation operation carried on in a time-shared manner for each channel. In order to achieve complex variation in harmonic content of the tone signal which is generated, the frequency of the carrier wave varies with the passage of time.