迄今为止,教科书中都认为人只能听到20至1600(赫兹)的声音。但德意志联邦共和国杜伊斯堡大学电声学和超声技术教研室的实验者惊喜地发现,人的耳朵亦能察觉直止40,000赫兹的声音。在约翰姆·汉伯茨教授领导下,为了做这样一个实验,研制了一种专用声音发生器,它能发出高纯度的超 So far textbooks have found that people can only hear from 20 to 1600 (Hertz) sound. However, the experimenter at the Department of Electroacoustics and Ultrasound Technology at the University of Duisburg in the Federal Republic of Germany was pleasantly surprised to find that the human ear was also able to detect sounds up to 40,000 Hz. Under the leadership of Professor John Haberz, in order to do such an experiment, a special sound generator has been developed that emits high purity