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. 18, 1991
Filed:
Apr. 28, 1989
Shigeru Uchiyama, Sayama, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A plurality of strings are extended along a surface of a body, and an operation by a player with respect to the strings is detected by two detection systems. The first detection system is operated when a string vibration is started, and electrically obtains an operated fret position of the string by detecting an ON/OFF operation of a switch arranged below each fret. The second detection system is enabled after the first detection system is enabled, and directly measures a pitch period of the string vibration. The second detection system detects a change in pitch by a choking operation or an arming operation of a tremolo arm with respect to the string after tone generation is started.