除非给他配备一个定向扬声器，否则谁也听不见他。
Unless he was equipped with a directional microphone, he was out of earshot.
声频定向扬声器是利用参量阵原理，产生高指向性声频信号的新一代扬声器。
Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.
为验证此方案，在半消声室进行了非典型声强向量阵的定向实验，用3个扬声器模拟体积目标3个不同部位的声源。
To test this scheme, experiment was conducted in a semi-anechoic chamber, with 3 loudspeakers simulating the sound sources of the 3 separate sections of the volume target.
所述容积包括相对于隔膜倾斜定向的区域，用于支持扬声器的低频响应。
The volume may include a region obliquely oriented relative to the diaphragm to support a low frequency response of the speaker.
当大厦的火警警报控制面板被触发，该扬声器会使用定向声音引导住户到最近的出口。
When triggered by the building's fire alarm control panel, it alerts building occupants to the location of the nearest exit using directional sound.
当大厦的火警警报控制面板被触发，该扬声器会使用定向声音引导住户到最近的出口。
When triggered by the building's fire alarm control panel, it alerts building occupants to the location of the nearest exit using directional sound.
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