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:
Dec. 21, 1982
Filed:
Dec. 18, 1980
Nippon Gakki Seizo Kabushiki Kaisha, Shizuoka, JP;
Abstract
An electronic musical instrument comprises a keyboard arranged to produce key code signals in response to key operations thereof and a memory storing performance data constituting progression of a music and corresponding to key operations to be effected on the keyboard to play the music. A key operation judging circuit is provided which compares the key code signals produced by the keyboard with the performance data read out of the memory to detect whether or not a pupil or trainee correctly operates keys in a corresponding relation to the performance data read out of the memory. The percentages of correct key operations are calculated and displayed with respect to the key-on timing and the pitch and duration of notes.