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第三章 声现象 1 教材特点 本章是新增的内容.全章共有“声音的发生和传播”、“音调、响度和音色”、“噪声的危害和控制”三节.第一节是本章的重点,讲述声音的发生、声音靠物质传播、声速、回声.第二、三节为介绍性内容,第二节讲述乐音的三个特征,第三节讲述噪声的危害和控制的常识.
Chapter III Sound Phenomenon 1 Textbook Features This chapter is a new chapter. The chapter contains three sections: “Sound Generation and Transmission”, “Pitch, Loudness and Timbre”, and “Harm and Control of Noise”. Section 1 is the focus of this chapter. It describes the occurrence of sounds, the sounds relying on the propagation of matter, the speed of sound, and the echoes. The second and third sections are introductory content, the second section describes the three characteristics of musical tones, and the third section describes noise hazards and common sense of control.