... traffic signal交通信号;交通讯号,指挥灯 audio signal声频信号;可听声信号 signal sourcen.信号源 ...
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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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