![]() This phenomenon is called a parametric array. ![]() It has been known that, as a result, the distortion is accumulated in the wave form and the carrier component is gradually attenuated as the sound wave propagates in the air, and the acoustic signal component in the audible band used for modulation is self-demodulated. Distortion, therefore, occurs in the waveform as the sound wave propagates in the air. When a modulated wave (sound wave) formed by a amplitude-modulating ultrasonic carrier wave at high sound pressure with an acoustic signal in an audible band is radiated in the air, because of nonlinearity of air, the sound speed becomes high at a location where the sound pressure is high and becomes low at a location where the sound pressure is low. Specifically, the present invention relates to an electrostatic ultrasonic transducer arranged to absorb sound waves output to the rear side of a push-pull type ultrasonic transducer and to emit sound waves only from the front side thereof, and an ultrasonic speaker using the transducer. The present invention relates to an electrostatic ultrasonic transducer and an ultrasonic speaker using the transducer.
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