| 摘要 |
PURPOSE: A sound wave transferring device using an ultrasonic wave is provided to far transfer the sound wave by forming a wave of condensation and rarefaction by the sound wave besides wave of condensation and rarefaction of an ultrasonic wave forged frequency. CONSTITUTION: A microphone(50) changes a sound wave into an electric signal. The electric signal transformed into the microphone or a saved sound of the electric signal is frequency-forged by a frequency modulation circuit. The frequency-forged signal generates a frequency-forged ultrasonic wave by driving on an ultrasonic generator. The ultrasonic generator is formed into a numerous piezoelectric element arranged like a concave dish. The ultrasonic generator forms a focus of the ultrasonic wave forged in a constant space of an air. The forged ultrasonic wave spreads out from a part passing by the focus. |
