这純粹是一件偶然的事儿。有一次,一个外国发明家无意中把少許面粉撒落在一个普通揚声器的紙盆里,当时揚声器正播送一支歌曲。令人惊奇的是:面粉一落上去,馬上散布开来,构成了許多同心圓,并且迅速向上,奔向紙盆的边緣,速度随着音調的变化而变化(图1)。小提琴响了,面粉散成薄层,蹦蹦跳跳地分层往上跑;女歌手唱起了高音“la”,它們又往下溜;一会儿鼓响了,它們又“沸騰”起来,瞬間布滿整个紙盆。 This is purely a coincidence. On one occasion, a foreign inventor inadvertently spilled a little flour into the cones of an ordinary speaker while the speaker was broadcasting a song. Surprisingly, as soon as the flour falls, it spreads out, forming many concentric circles, and moving quickly upward toward the edge of the cone, and the speed changes as the pitch changes (Fig. 1). The violin rang, the flour spread into thin layers and ran up and down. The female singers sang the treble “la” and they glided again; Full of paper cones.