最近,日本经济新闻以大幅篇幅介绍了日本松下公司研制的一种“超指向性扬声器”。它可以象聚光一样,把声音会聚到一定的方向,只使处于特定范围的人听到它放出的声音。众所周知,人耳可闻卢的频率为20Hz～20kHz,声音的波长长,很难获得指向性。那么,“超指向性扬声器”是利用什么原理来获得强指向性声音的呢?原来它采用了波长非常短、可以 Recently, Nihon Keizai Shimbun introduced a “super-directional loudspeaker” developed by Japan’s Panasonic Corporation for a substantial length. It collects the sound in the same direction as the light, so that only those in a particular area hear the sound it emits. As we all know, the frequency of human hearing Lu is 20Hz ~ 20kHz, the wavelength of the sound is long, it is difficult to obtain the directivity. So, “super-directional speaker” is the use of what principle to obtain the strong directivity of the sound? Originally it uses a very short wavelength, you can