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:
Jul. 04, 1978
Filed:
Dec. 10, 1976
Eisaku Okamoto, Hamakita, JP;
Kiyoshi Ichikawa, Hamakita, JP;
Abstract
An electronic musical instrument includes a pitch determining voltage signal generating circuit adapted to produce one of 12 pitch determining voltage signals having different magnitudes corresponding to 12 notes in one octave in response to any of keys belonging to different octave ranges in a keyboard and having the same note name. A pitch determining voltage signal common to the different octave ranges is converted by a voltage converting circuit and taken out as a voltage signal having a magnitude corresponding to the note of a key being depressed on the keyboard. The voltage converting circuit includes a voltage dividing network having a plurality of output points and gate circuits connected to the output points, respectively. Each gate circuit is enabled in response to the depression of a key belonging to a corresponding octave range. Alternatively, the voltage converting circuit is constructed of a variable gain amplifier whose voltage gain is controlled dependent upon the octave range to which a key being depressed belongs.