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:
Feb. 16, 1993
Filed:
Aug. 02, 1990
Toshihiro Inoue, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A musical tone synthesizing apparatus simulating a wind instrument includes an excitation circuit simulating a reed operation of a mouth piece portion, a resonance circuit simulating a resonance tube and a musical tone control circuit. The excitation circuit produces an excitation signal based on an input signal and a reflected wave signal transmitted from the resonance circuit. The excitation signal is input to the resonance circuit. The resonance circuit includes a bi-directional transmission circuit and a junction unit which is inserted into the bi-directional transmission circuit. The junction unit caries out a scattering operation corresponding to a scattering operation of compression wave of air which is occurred in the vicinity of the tone hole of the resonance tube. The excitation signal propagates through the bi-directional transmission circuit in a forward direction as a progressive wave signal. Then, a signal which is occurred by a scattering operation of the junction unit and the like propagates through the bi-directional transmission circuit in a backward direction as foregoing reflected wave signal. The signal operation of the resonance circuit, i.e., the delay time required for circulating the excitation signal through the closed-loop including the excitation circuit at least is controlled by the musical tone control circuit in response to an open/close operation applied to a tone hole so that musical tones which are generated by the non-electronic wind instrument having a plurality of tone holes are to be synthesized.