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一种能将声音聚集到一定范围和距离的超定向扩音器最近在日本问世。过去使用的扩音器所发出的声音象光一样不易集中,在一定范围内任何一个角度都能听到,对不需要该声音的角度就是一种噪
A super-directional loudspeaker that can gather sounds to a range and distance has recently come out in Japan. In the past, the sound emitted by the loudspeaker was not as easy to concentrate as the light and could be heard at any angle within a certain range. The angle to the unwanted sound was a noise