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. 03, 1981
Filed:
Jun. 20, 1978
Applicant:
Inventor:
William R Hoskinson, Geneva, IL (US);
Assignee:
The Wurlitzer Company, DeKalb, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10H / ;
U.S. Cl.
CPC ...
84-126 ; 84-113 ;
Abstract
In a digital electronic organ or the like external waves of controllable duty cycle are used to control the on time of a field effect transistor (FET) through which a capacitor is charged. A similar rectangular wave of controllable duty cycle is applied to a second FET to control the on time thereof for controlling the discharge of said capacitor. The state of charge of said capacitor is used to control the conductivity of yet another FET through which a desired frequency is conducted to effect enveloping of such frequency with the desired attack and decay characteristics.