CHAPTER 1
What is Sound?
CHAPTER CONTENTS
Characteristics of a Sound Wave
Frequency Spectra of Repetitive Sounds
Frequency Spectra of Non-Repetitive Sounds
Displaying the Characteristics of a Sound Wave
Sound Power and Sound Pressure
A VIBRATING SOURCE
Sound is produced when an object (the source) vibrates and causes the air around it to move. Consider the sphere shown in Figure 1.1. It is a pulsating sphere which could be imagined as something like a squash ball, and it is pulsating regularly so that its size oscillates between being slightly larger than normal and then slightly smaller ...
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