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:
Feb. 26, 1980
Filed:
Feb. 22, 1978
Shigeru Yamada, Hamamatsu, JP;
Kiyoshi Ichikawa, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
In an electronic musical instrument of a numerical value processing type, an operation of a key causes the generation of a numerical value corresponding to the operated key and a tone having a frequency determined by the numerical value is produced. A vibrato effect is obtained by periodic modification of the value. The instrument comprises a circuit which generates a periodic signal having a portion in which the amplitude of the periodic signal increases at a predetermined rate, and a succeeding portion having a constant amplitude, and a circuit for varying the rate. The rate varying circuit sets the rate to be either a low rate that can be discriminated by human ears or a high rate that can not be discriminated by human ears.