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:
May. 03, 1983
Filed:
Oct. 21, 1981
Akiyoshi Oya, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A root note detection circuit detects the highest or lowest key among depressed keys in an accompaniment key range as a root note designation key. A root note memory stores the detected root note data and rewrites its storage each time the detected root note data changes. A chord type detection circuit detects a chord type in accordance with states of depression of keys other than the detected root note designation key in the accompaniment key range. The detected chord type data is stored in a chord type memory by being controlled by outputs of a root note change memory and a new key detection circuit. The root note change memory detects change in the root note by comparing the output of the root note detection circuit with the output of the root note memory and outputs a root note change signal during a preset waiting timing. Accordingly, the data stored in the chord type memory can be rewritten not only upon detection of depression of a new key but during this waiting time. False chord type data which is temporarily detected when the root note designation key is changed in a legato style ceases to be detected within this waiting time so that correct data is finally stored in the memory. A chord is determined by the root note data and the chord type data stored in these memories.