换能器发出的超声信号携带输入的音频信号信息，在空气中发生非线性作用，解调为可听声。
The ultrasonic signal which is emitted from the transducer carries the input audio signal information, does the nonlinear interaction in the air and is demodulated into audible sound.
换能器发出的超声信号携带输入的音频信号信息，在空气中发生非线性作用，解调为可听声。
The ultrasonic signal which is emitted from the transducer carries the input audio signal information, does the nonlinear interaction in the air and is demodulated into audible sound.
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