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:
Sep. 27, 1983
Filed:
Aug. 25, 1981
Mitsumi Katoh, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A musical tone is synthesized by controlling harmonic components of a note selected in a keyboard in accordance with a desired fixed formant. A parameter computation circuit detects a harmonic frequency which is nearest to a center frequency of the fixed formant and produces FM computation parameters using the nearest harmonic frequency as a carrier frequency and a fundamental or harmonic frequency of the selected note as a modulating frequency. A frequency modulation circuit performs an FM computation on the basis of these parameters and, as a result, a tone whose harmonic components have been controlled in accordance with a formant having the nearest harmonic frequency as a central component is synthesized. The parameter computation circuit computes frequency difference between the nearest harmonic frequency and the center frequency of the fixed formant for controlling the level of a formant synthesized in a frequency modulation circuit in accordance with this frequency difference. This level control is achieved by controlling an amplitude coefficient of a tone or a modulation index in the FM computation. A subformant having as its central component another harmonic frequency in the vicinity of the nearest harmonic frequency may be formed in a relatively low level for reinforcing the formant with this subformant.