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声音对于我们每个人都是十分熟悉的。因为我们每个人从呱呱坠地时起,便投入了一个充满声音的世界。人们不仅能收听外界的声音,借以对本身的行动作出有利的判断;人们还常常主动地产生一些声音,来满足某些需要。且不说,人们说话、唱歌或演奏乐器这些生活中必不可少的活动。当你用手拍打西瓜,以便挑一个好的;从碰撞两件磁器发出的清脆的声音中,来判断有没有裂纹……等等,无不是在与声学打交辺了。至于收音机是否好听,打电话怎样更清楚,也都存在着声学问题。可以毫不夸张地说,我们每个人都自觉或不自觉地加入了“业余”声学爱好者的行列。声学对于我们每个人又都有些陌生。因为声学的研究领域,已经远远地超出了我们在日常生活中迂到的,或者人耳所能听到的声音这个范围。声学是研究各种物质中机械波的产生、传抪和接收的科学。现代声学研究的频率范围是:
The sound is very familiar to everyone of us. Because every one of us has devoted himself to a world full of sound since it was born. People can not only listen to the voices of the outside world in order to make favorable judgments about their actions; people also often take the initiative to produce some sound to meet certain needs. Not to mention the essential activities people speak, sing, or play musical instruments. When you tap the watermelon in order to pick a good one; judging from the crisp sound of the collision of the two pieces of magnetism, there is no crack ... and so on, all of which are not talking to the acoustics. As for the radio is good, how to call more clearly, there are also acoustic problems. It is no exaggeration to say that each of us consciously or unconsciously joined the ranks of “amateur” acoustics enthusiasts. Acoustic is strange to everyone of us. Because of the field of acoustics, it has gone far beyond the range of sounds that we have circulated in our daily lives or heard by human ears. Acoustics is a science that studies the generation, transmission, and reception of mechanical waves in various materials. The frequency range of modern acoustic research is: