... 定向光谱发射率；定向发射率谱分布 directional spectral emissivity 定向换能器 directional transducer 定向耦合器式衰减器 directional-coupler attenuator ...
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无定向换能器 nondirectional transducer
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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。
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.
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