Patent ID: 7470852

Claim:
A tone generator control apparatus comprising: a tubular body section having an elongated cavity communicating with an open end thereof, said tubular body section having, on an outer peripheral surface thereof, a lip plate having an embouchure hole communicating with the cavity and a plurality of pitch-designating tone keys; a first detection section provided, on or near an edge of the lip plate which an air jet from the embouchure hole impinges against, for detecting a flow velocity or intensity of the air jet; a second detection section provided, on or near the edge of the lip plate, for detecting a length of the air jet; a jet transfer time determination section that, on the basis of detection outputs of said first detection section and said second detection section, determines a jet transfer time required for transfer of the air jet between a jet blowout outlet and the edge of the lip plate; a fingering detection section that detects a fingering state on the plurality of tone keys; a designation section that designates a frequency of a tone signal of a predetermined pitch name of a predetermined octave to be generated in correspondence with the fingering state detected by said fingering detection section; a calculation section that calculates a jet parameter corresponding to a product between the frequency designated by said designation section and the jet transfer time determined by said determination section; a first control section that, on the basis of the detection output of said first detection section, controls a tone generator section to generate the tone signal of the predetermined octave; a second control section that, upon detecting that the jet parameter calculated by said calculation section has decreased to a first predetermined value during generation, by the tone generator section, of the tone signal of the predetermined octave, controls the tone generator section to raise a pitch of the tone signal, currently being generated, by one octave; and a third control section that, upon detecting that the jet parameter calculated by said calculation section has increased to a second predetermined value, greater than said first predetermined value, during generation, by the tone generator section, of the tone signal of the pitch having been raised by one octave, controls the tone generator section to lower the pitch of the tone signal, currently being generated, by one octave.