| 摘要 |
PURPOSE: Audio media storing an ultrasonic signal, a system and method using the audio medium are provided to store and process an ultrasonic signal for exterminating noxious insects together with general audio signals. CONSTITUTION: Audio media store a signal(60) obtained by synthesizing an audio signal(40) in an audio frequency band and an ultrasonic signal(30) in an ultrasonic frequency band for exterminating noxious insects. The audio media reproduce the audio signal and the ultrasonic signal, simultaneously, so as to exterminate noxious insects using the ultrasonic signal. The ultrasonic frequency band for exterminating noxious insects is 25-65 KHz. The audio media includes a CD, digital audio tape, magnetic tape, wired and wireless broadcasting channels and Internet broadcasting channel.
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