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:
Jan. 12, 1993
Filed:
Apr. 05, 1991
Hiroko Okuda, Kokubunji, JP;
Junichi Minamitaka, Fussa, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A tonality determining apparatus provides a tonality analysis of a chord progression. The apparatus includes a chord function knowledge database storing musical knowledge of evaluating a function of each chord in the chord progression. A keynote and function progression extractor determines a keynote and function of each chord in the chord progression from a chord progression input device in accordance with the function knowledge database. From the extractor's results a tonality data generator produces tonality data defining a pitch class set available in each chord time interval. The tonality determining apparatus is applied to an accompaniment apparatus for playing an accompaniment with a desired tonality.