Sine wave output, low distortion and high stability, frequency range over with whole audio range.
正弦波输出，失真小，稳定性好，频率范围覆盖整个音频范围。
Because the ultrasonic wave has the directivity, the audible audio frequency demodulated from the interior of the ultrasonic wave also has the directivity and forms a directional audible sound.
一声频定向换能器，以定向发射超声波给接听者，其中该超声频段部分经空气自解调而还原为原音频信号。
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