ACOUSTIC SYSTEM

PROBLEM TO BE SOLVED: To provide an acoustic system capable of carrying out loudspeaking of sound such as commentary for audience in real time even during competitive sport by players. SOLUTION: The acoustic system is provided with: a sound source 1 for generating an audible signal; a modulator 3 for modulating a carrier with an ultrasonic band by the audible signal; a radiator 5 for emitting a modulation signal from the modulator to spectator's seats as a sound wave with super-directivity so as to deliver the audible sound only to the spectator's seats through the sound wave with the super-directivity; a speaker 8 for emitting the audible signal from the sound source 1 as a sound wave to deliver the audible sound to a stadium; and a changeover device 2 for switching an output destination of the audible sound signal from the sound source 1 to the modulator 3 or the speaker 8. COPYRIGHT: (C)2006,JPO&NCIPI