Noise is generally defined as "unwanted sound". Major concerns are1.hearing damage resulting from exposure to excessive noise; 2.interference of speech or interruption of communication by noise; and 3.noise to interference of sleep, leisure and other activities. The contents of this course include: physical properties of sound, effects of noise on people, occupational damage, sources of noise, analysis of its damage, analysis of noise exposure, noise measuring instruments, sound surveys, elemental theories of noise control, noise control program.