Patent ID: 7390959
Filing Date: 2008-06-24
Classification: G10H

Abstract:
1. A tone control device adapted to an electronic wind instrument having a tube, a lip plate having a blow hole, a plurality of tone keys, and a tone generator, said tone control device comprising: a jet flow sensing means for detecting a velocity or strength of a jet flow, which is caused by blowing air into the blow hole and is transmitted so as to collide with an edge, wherein a jet width is detected based on the output of the jet flow sensing means including a plurality of flow sensors horizontally arranged with respect to the edge; a jet length sensing means for detecting a jet length within a range between the lip plate and the edge; a jet transmission time detection means for detecting a jet transmission time in which a jet travels from a jet outlet in proximity to the blow hole to the edge on the basis of the output of the jet flow sensing means and the output of the jet length sensing means; a fingering state detection means for detecting a fingering state based on operated states of the tone keys; an audio frequency designation means for designating an audio frequency realizing a desired note and a desired octave based on the fingering state; a jet angle calculation means for calculating a jet angle by way of a multiplication using the audio frequency and the jet transmission time; and a tone generator control means for controlling the tone generator in terms of an amplitude and a tone pitch of a musical tone signal based on the output of the jet flow sensing means, wherein the tone generator control means controls the musical tone signal so as to be increased in tone pitch by one octave when the jet angle belongs to a first range, and the tone generator control means controls the musical tone signal so as to be decreased in tone pitch by one octave when the jet angle belongs to a second range higher than the first range during generation of the musical tone signal whose tone pitch is once increased by one octave.